2001 Colorado field crop insect management research and demonstration trials

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TABLE OF CONTENTS

Control of Russian wheat aphid in winter wheat with hand-applied insecticides, ARDEC, Fort Collins, CO, 2001 1 Control of Russian wheat aphid in spring barley with hand-applied insecticides, a resistant variety and seed

treatments, ARDEC, Fort Collins, CO, 2001 3

Control of alfalfa insects in alfalfa with hand-applied insecticides, ARDEC, Fort Collins, CO, 2001 6 Control of western corn rootworm in corn, ARDEC, Fort Collins, CO, 2001 9 Control of corn spider mites in corn with hand-applied insecticides, ARDEC, Fort Collins, CO, 2001 12 Control of western bean cutworm with hand-applied insecticides, Haxtun, CO, 2001 14 Control of sunflower stem weevil in sunflowers with planting and cultivation treatments, Central Great Plains

Research Station, Akron, CO, 2001 15

The 2001 Golden Plains Pest Survey Program 16

Contributors to the 2001 Golden Plains Pest Survey Program 17

Summary of 2001 light and suction trap catches 19

lnsecticidepe~ormancesummaries... 29 Acknowledgments . . . . . . . . . . . . . . . . . . .._..._..._..__.._ 33 Product Index .._..____._.__..._...__.._.__._.__.,.___,__,.,....__,.__,__.,,..,,...,__, 34

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CONTROL OF RUSSIAN WHEAT APHID IN WINTER WHEAT WITH HAND-APPLIED INSECTICIDES, ARDEC, FORT COLLINS, CO, 2001

Shawn Walter, Jeff Rudolph, Terri Randolph, Jesse Stubbs, Alicia Bosley, Walter Schmidt, Frank Peaks, Department of Bioagricultural Sciences and Pest Management

CONTROL OF RUSSIAN WHEAT APHID IN WINTER WHEAT WITH HAND-APPLIED INSECTICIDES, ARDEC, FORT COLLINS, CO, 2001: Treatments were applied on 18 April 2001 with a ‘rickshaw-type’ CO, powered sprayer calibrated to apply 20 gal/acre at 3 mph and 30 psi through three 8004 (LF4) nozzles mounted on a 5.0 ft boom. Conditions were clear and calm and 55°F temperature at the time of treatment. Plots were 6 rows (5.0 ft) by 28.0 ft and were arranged in six replicates of a randomized, complete block design. Crop stage at application was jointing (Zadoks 33-35). The crop had been infested with greenhouse-reared aphids on 8 and 20 March 2001.

Treatments were evaluated by collecting 20 symptomatic tillers per plot one day prior and one, three and four weeks after treatment. Tiller samples were placed in Berlese funnels for 24 hours to extract aphids into alcohol for counting. Precounts averaged 129 f 26 Russian wheat aphids per 20 symptomatic tillers. Aphid counts

transformed by the square root + % method were used for analysis of variance and mean separation by the Student-Neuman-Keul test (a=0.05). Original means are presented in the tables. Total insect days for each treatment were calculated according the method of Ruppel (Journal of Economic Entomology 76: 375-7, 1983). Reductions in insect days were calculated by Abbott’s (1925) formula: (percent reduction =

((untreated-treated)/untreated) X 100). Insect days were also compared by analysis of variance and the Student-Neuman-Keul test (a=0.05) with original means presented in the tables.

Aphid pressure was as severe as in past artificially-infested winter wheat experiments, about 20 aphids/tiller in the untreated control at 3 weeks post treatment. All treatments had fewer aphids than the untreated control at one, three and four weeks after treatment. All treatments had fewer aphid days than the untreated control over the course of the experiment. Di-Syston 8E, 0.75, Warrior T. 0.03, XR 225 60 g/l, 0.015, dimethoate 4E 0.38 and Lorsban 4E-SG, 0.25,0.38 and 0.5 treatments reduced total aphid days over four weeks by more than QO%, the level of performance observed by the more effective treatments in past experiments. No phytotoxicity was observed with any treatment.

Field History Pest: Cultivar: Planting Date: Irrigation: Crop History: Herbicide: Insecticide: Fertilization: Soil Type: Location:

Russian wheat aphid, Diuraphis noxia (Mordvilko) ‘TAM 107

14 September 2000

Once post planting, linear move sprinkler with drop nozzles Fallow in 2000

None

None prior to experiment None

Sandy clay loam, OM 1.8%, pH 7.9

ARDEC, 4616 North Frontage Road, Fort Collins, CO 80524 (south half of Block 1070)

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Table 1. Control of Russian wheat aphid in winter wheat, ARDEC, Fort Collins, CO, 2000. APHIDS PER TILLER f SEM’

PRODUCT, LB (AI)/ACRE 1 WEEK 3 WEEKS 4 WEEKS TOTAL APHID DAYS f SEM’ % REDUCTION’

DI-SYSTON 8E, 0.75 0.3 f 0.0 c 0.1 f 0.1 D 0.1 f 0.0 c 32.1 f 8.6 C 99 LORSBAN 4E-SG. 0.5 0.2 f 0.1 c 0.4 f 0.3 CD 0.0 f 0.0 c 77.0 f 46.6 C 98 XR 225 60 s/l, 0.015 0.4 f 0.1 c 0.8 f 0.4 CD 1.9f 1.2 BC 247.9 f 84.1 C 95 LORSBAN 4E-SG, 0.38 0.3 f 0.1 c 0.9 f 0.6 CD 0.2 f 0.2 c 156.9 f 77.1 C 97 LORSBAN 4E-SG, 0.25 0.5 f 0.1 c 1 .O f 0.3 CD 0.9 f 0.8 BC 232.8 f 55.3 C 95 DIMETHOATE 4E 0.38 0.7 f 0.2 BC 1 .O f 0.3 CD 1 .O f 0.3 BC 267.8 f 66.8 C 95 WARRIOR T, 0.03 0.3 f 0.1 c 1.2+0.5CD 0.5 f 0.3 BC 224.6 f 66.1 C 96 XR 225 60 g/l, 0.005 1.4 f 0.5 BC 2.5 f 0.5 BCD 3.2 f 1.3 BC 662.1 f 140.9 BC 87 CAPTURE 2E, 0.03 0.7 k 0.2 BC 2.6 f 0.9 BCD 2.9 f 1.1 BC 613.1 f 145.4 BC 88 WARRIOR T, 0.01 1.250.3BC 3.9 f 2.3 B 2.7*1.8BC 816.1 f 336.0 BC 84 FO570 0.8EW, 0.017 2.4 f 1 .O B 6.5zt1.9B 6.7 f 4.3 B 1547.6 f 516.9 B 69 UNTREATED 6.8 i 1.4 A 17.8f2.2A 29.1 f 4.5 A 5002.1 f 578.2 A - F Value 14.63 17.27 16.21 28.27 P’F < 0.0001 < 0.0001 < 0.0001 < 0.0001

‘SEM, standard errcw of the mean. Means in the same column followed by the same letter(s) are not statistically different, SNK @=0.05). 2Percent reduction in total aphid days, calculated by the Ruppel method.

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CONTROL OF RUSSIAN WHEAT APHID IN SPRING BARLEY WITH HAND-APPLIED INSECTICIDES, A RESISTANT VARIETY AND SEED TREATMENTS, ARDEC, FORT COLLINS, CO, 2001

Shawn Walter, Jeff Rudolph, Tern Randolph, Hayley Miller, Jesse Stubbs, Alicia Bosley, Silas Davidson, Walter Schmidt, Frank Peairs, Department of Bioagricultural Sciences and Pest Management

CONTROL OF RUSSIAN WHEAT APHID IN SPRING BARLEY WITH HAND-APPLIED INSECTICIDES, A RESISTANT VARIETY AND SEED TREATMENTS, ARDEC, FORT COLLINS, CO, 2001: Hand-applied treatments were applied on 25 May 2001 with a ‘rickshaw-type’ CO 2 powered sprayer calibrated to apply 20 gal/acre at 3 mph and 30 psi through four 8004 (LF4) nozzles mounted on a 5.0 fl boom. Conditions were overcast with O-4 mph winds and temperature was 55°F at the time of treatment. Crop stage at application date was jointing (Zadoks 32-33). The resistant variety and seed treatments were planted on 29 March 2001 with a John Deere Maxi-Merge Planter at a rate of one million seeds/acre, Plots were 6 rows (5.0 ft) by 25.0 fi and were arranged in six replicates of a randomized, complete block design. The crop had been infested at the 2 leaf stage (Zadoks 12) with greenhouse-reared aphids on 19 and 27 April 2001.

Treatments were evaluated for the hand-applied insecticide plots by collecting 20 symptomatic tillers per plot three days prior and one, two and three weeks after treatment, Treatments were evaluated for the resistant variety and seed treatments by collecting 20 random tillers per plot three days prior and one, two and three weeks after treatment. Tiller samples were placed in Berlese funnels for 24 hours to extract aphids into alcohol for counting. Precounts averaged 330 + 19 Russian wheat aphids per 20 symptomatic tillers and 94 f 33 Russian wheat aphids per 20 random tillers. Aphid counts transformed by the square root + % method were used for analysis of variance and mean separation by the Student-Neuman-Keul test ( a=0.05). Original means are presented in the tables. Total insect days for each treatment were calculated according the method of Ruppel (Journal of Economic Entomology 76: 375-7, 1983). Reductions in insect days were calculated by Abbott’s (1925) formula: (percent reduction = ((untreated-treated)/untreated) X 100). Insect days were also compared by analysis of variance and the Student-Neuman-Keul test ( a=0.05) with original means presented in the tables. Yields were taken on 26 July 2001 with a Wintersteiger plot combine. Yields were converted to bushels per acre adjusted by subsample moisture. Plot yields were compared by analysis of variance and the Student-Neuman-Keul test (a=0.05).

Aphid pressure was more severe than observed in past artificially-infested spring barley experiments. All treatments had fewer aphids than the untreated control at each sampling date (Tables 1 and 2). All treatments had fewer aphid days than the untreated control (Tables 1 and 2). In hand-applied plots, Warrior T, 0.03, Warrior T, 0.01 and Lorsban 4E-SG, 0.50 reduced total aphid days by more than 90% after 3 weeks, the level of performance observed by the more effective treatments in past spring barley experiments (Table 1). In the resistant variety and seed treatment plots, Warrior T, 0.03, Adage 5 FS, 0.75 fl. oz.1100 lb. seed and Adage 5 FS. 1.33 fl. oz./l 00 lb. seed reduced total aphid days by more than 90% after 3 weeks (Table 2). No

phytotoxicity was observed with any treatment.

In hand-applied plots, Warrior T, 0.03, Warrior T, 0.01, Lorsban 4E-SG, 0.50 and XR 225 60 g/l. 0.015 yielded more than the untreated control (Table 1). In the resistant variety and seed treatment plots, Warrior T, 0.03, Adage 5 FS, 0.75 fl. oz./l00 lb. seed and Adage 5 FS, 1.33 fl. oz.1100 lb. seed yielded more than the untreated control (Table 2). The Adage treatments were infested when the plants were potentially toxic to the aphids and may not have received infestation comparable with other treatments.

Field History Pest: Cultivar: Planting Date: Irrigation: Crop History: Herbicide: Insecticide: Fertilization: Location:

Russian wheat aphid, Diuraphis noxia (Mordvilko) Moravian 37, C56

29 March 2001

Linear move sprinkler with drop nozzles Corn in 2000

Harmony Extra, 0.3 ox/acre, Bronate, 1 pt/acre, Starane, 2/3 ptlacre on 25 May 2001 None prior to experiment

None

ARDEC, 4616 North Frontage Road, Fort Collins, CO 80524 (southwest corner of Block 1080)

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Table I. Control of Russian wheat aphid in spring barley, ARDEC. Fort Collins, CO, 2001. APHIDS PER TILLER i SEM’

PRODUCT, LB(AI)/ACRE 1 WEEK 2 WEEKS 3 WEEKS TOTAL APHID DAYS % YIELD’

f SEM’ REDUCTION’ WARRIOR T, 0.03 0.9 f 0.3 c 0.1 f 0.0 D WARRIOR T, 0.01 2.9*1.oc 0.4 f 0.1 D LORSBAN 4E-SG, 0.50 0.8 f 0.4 C 2.8 f 0.7 CD XR 225 60 g/l. 0.015 3.0 f 0.8 C 4.0 f 0.7 c XR 225 60 g/l, 0.005 14.8 f 3.0 B 15.4f3.7B FO570 O.EEW, 0.017 10.0 i 2.5 B 20.1 f 5.9 B UNTREATED CONTROL 44.7 f 4.1 A 77.4 f 4.8 A 4.9 f 0.8 D 12.3 f 2.9 D 27.9 f 12.7 CD 39.0 f 4.7 CD 86.4 f 19.2 BC 137.4 f 32.6 B 321.3 f 106.0 A 413.6 f 61.9 B 99 31 A 1125.8 f 188.8 B 97 31 A 2373.6 f 965.2 B 93 24 AB 3500.6 f 365.3 B 90 23 AB 9245.6 f 61.9 B 75 18 ABC 13128.5 f 2672.3 B 64 14 BC 36463.0 f 7450.1 A --- 9c F Value 82.93 75.98 15.65 17.04 5.59 P’F < 0.0001 < 0.0001 < 0.0001 < 0.0001 0.0005

‘SEM, standard error of the mean. Means in the same column followed by the same letter(s) are not significantly different, SNK @=0.05). ‘Percent reduction in total aphid days, calculated by the Ruppe method.

3Yield presented in bushels/awe adjusted to 12% moisture.

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Table 2. Control of Russian wheat aphid in spring barley, ARDEC, Fort Collins, CO, 2001. APHIDS PER TILLER k SEM’

PRODUCT, LBfAI)/ACRE 1 WEEK 2 WEEKS 3 WEEKS TOTAL APHID DAYS % YIELD’

WARRIOR T, 0.03 0.6 f 0.2 C 0.6 f 0.4 C 0.6 f 0.3 C I 58.7 f 58.7 c 100 31 AB

ADAGE 5 FS, 0.75 fl. oz./l00 lb. seed 0.1 f 0.1 c 0.3 f 0.1 c 2.2 * 1.5 c 203.6 f 112.9 C 99 41 A ADAGE 5 FS, 1.33 fi. oz./l00 lb. seed 0.0 f 0.0 c 0.2 f 0.1 c 2.3kl.ZC 198.9 f 82.0 c 99 36 A C56 (Russian wheat aphid resistant variety) 27.1 f 9.8 B 35.5 f 13.0 B 136.2 f 21 .I B 16395.2 f 3423.4 B 50 20 BC

UNTREATED CONTROL 41.8*7.0A 56.0 f II .9 A 319.0 f 50.7 A 33093.1 f 2342.3 A --- 9c

F Value 35.18 34.13 95.70 62.65 10.75

P’F < 0.0001 < 0.0001 < 0.0001 < 0.0001 < 0.0001

‘SEM. standard error of the mean. Means in the same column followed by the same letter(s) are not significantly different. SNK (0=0.05). 2Percent reduction in total aphid days, calculated by the Ruppel method.

VieId presented in bushels/sue adjusted to 12% moisture.

2001 FIELD CROP INSECT MANAGEMENT - 5

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CONTROL OF ALFALFA INSECTS IN ALFALFA WITH HAND-APPLIED INSECTICIDES, ARDEC, FORT COLLINS, CO, 2001

Shawn Walter, Jeff Rudolph, Tern Randolph, Mary Donohue, Jesse Stubbs, Alicia Bosley, Silas Davidson, Walter Schmidt, Frank Peairs, Department of Bioagricultural Sciences and Pest Management

CONTROL OF ALFALFA INSECTS IN ALFALFA WITH HAND-APPLIED INSECTICIDES, ARDEC, FORT COLLINS, CO, 2001: Early treatments were applied on 18 April 2001 with a ‘rickshaw-type’ CO, powered sprayer calibrated to apply 20 gal/acre at 3 mph and 30 psi through six 8004 (LF4) nozzles mounted on a 10.0 fl boom. All other treatments were applied on 24 May 2001. Conditions were clear and calm and 55°F temperature at the time of early treatments. Conditions were overcast with O-4 mph winds and temperature was 55°F at the time of late treatments. Plots were 10.0 ft by 30.0 fl and arranged in four replicates of a randomized, complete block design. Untreated control and Furadan 4F plots were replicated eight times for a more accurate comparison of treatment effects on yield. Crop was breaking dormancy at the time of early treatments. Crop height at the time of late treatments was 2.0 ft.

Treatments were evaluated by taking 10, 180” sweeps per plot with a standard 15 inch diameter insect net one, two and three weeks afler late treatments. Precounts were taken two days prior to late treatments by taking 50, 180” sweeps per replication. Alfalfa weevil larvae, alfalfa weevil adults and pea aphids were counted. Precounts averaged 26.4 alfalfa weevil larvae, 0.1 alfalfa weevil adults and 0.2 pea aphids per sweep. Insect counts transformed by the square root + % method were used for analysis of variance and mean separation by the Student-Neuman-Keul test (a=0.05). Original means are presented in the tables. Yields of strips 4 fl wide by 30 ft long, were taken in the Furadan 4F, 0.50 Ib(Al)/acre and untreated control plots on 15 June 2001 with a Carter forage harvester, which cuts and weighs a 4 fl wide swath of alfalfa. Yields were converted to tons per acre adjusted by subsample moisture. Treated plots were compared to the untreated control using a two-tailed t-test with assumed equal variance (a=0.05).

Alfalfa weevil and pea aphid pressure was high. All treatments had fewer alfalfa weevil larvae than the untreated control at one and two weeks afler treatment. No treatments had fewer alfalfa weevil adults than the untreated control at one, two or three weeks afler treatment. No treatment had fewer pea aphids than the untreated control at two and three weeks after treatment. No phytotoxicity was observed with any treatment. The plots treated with Furadan 4F, 0.50 Ib(Al)/acre yielded 0.51 tons/acre, 20.9% more than the untreated plots which yielded 0.34 tons/acre. The difference was significant (two-tailed t-test, t=2.63, df=14, p(t+,,)=0.0199 ). Yield reduction measured since 1995 has averaged 10.1%. with a range of 2.3% to 20.9%.

Field History Cultivar: Plant Stand: Irrigation: Crop History: Herbicide: Insecticide: Fertilization: Soil Type: Location:

Alfalfa weevil, Hypera postica (Gyllenhal) Pea aphid, Acyrf/rosiphon pisum (Harris) Unknown

Thin but uniform, weeds

Linear move sprinkler with drop nozzles Alfalfa since 1994

None

None prior to experiment None

Sandy Clay, OM 1.7%, pH 7.8

ARDEC, 4616 North Frontage Road, Fort Collins, CO, 80524 (Block 1030)

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Table 1. Control of alfalfa weevil larvae, ARDEC, Fort Collins, CO, 2001.

ALFALFA WEEVIL LARVAE PER SWEEP f SEM’

PRODUCT. LBIAMACRE 1 WEEK 2 WEEKS 3 WEEKS

BAYTHROID 2E. 0.0359 WARRIOR 1E. 0.03 WARRIOR 1E. 0.02 BAYTHROID 2E, 0.025 FO570, 0.017 FURADAN 4F. 0.50*

FURADAN 4F, 0.50 + DIMETHOATE 4E, 0.25 FURADAN 4F. 0.25 STEWARD, 0.110 LORSBAN 4E, 0.75 STEWARD, 0.065 LANNATE LV, 0.90 F0517.0.017 (EARLY) WARRIOR IE, 0.02 (EARLY) UNTREATED CONTROL* 0.4 f 0.1 c 0.3 f 0.1 c 0.8 i 0.4 C 1 .o f 0.5 c 0.7 f 0.1 c 0.5 f 0.2 c 0.5 f 0.5 c 0.2 +_ 0.1 c 0.2 t 0.1 c 0.1 f 0.1 c 0.3 f 0.1 c 0.7 f 0.1 c 13.3k2.8B 8.4 f 1.8 B 49.1 f 6.8 A 0.5 f 0.1 c 0.5 f 0.2 c 1.1 f 0.3 c 1.1 f0.4C 1.1 *0.3c 0.2 f 0.1 c 0.1 f 0.1 c 0.3 f 0.2 c 1.3 f 0.2 c 0.5 f 0.2 c 2.0 f 0.4 c 3.9 f 0.7 c 25.8 f 4.0 B 17.5 f 5.5 B 60.4 f 8.1 A 0.1 f 0.1 F 0.3 f 0.2 EF 0.4 f 0.2 DEF 0.5 f 0.4 DEF 0.6 f 0.1 DEF 1.2 f 0.2 DEF 1.6 f 0.3 CDEF 2.0 f 0.3 CDE 2.2 f 0.6 CDE 2.2 f 0.2 CD 2.4 i 0.5 CD 3.6 f 0.7 C 10.7k2.36 13.7 f. 2.4 AB 15.2f l.OA F Value 51.84 44.37 52.90 P’F < 0.0001 < 0.0001 < 0.0001

‘SEM. standard error of the mean. Means in the same column followed by the same letter(s) are not statistically different, SNK (a=0.05) ‘Treatment repeated (8 replicates rather than 4) for purposes of measuring yield.

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Table 2. Control of alfalfa weevil adults, ARDEC, Fort Collins, CO, 2001.

ALFALFA WEEVIL ADULTS PER SWEEP f SEM’

PRODUCT, LBIAIYACRE 1 WEEK 2 WEEKS 3 WEEKS

STEWARD, 0.065 STEWARD, 0.110

FURADAN 4F, 0.05 + DIMETHOATE 4E. 0.25 WARRIOR 1 E. 0.02 (EARLY) UNTREATED CONTROL’ LANNATE LV, 0.90 LORSBAN 4E. 0.75 FO570.0.017 (EARLY) FURADAN 4F, 0.25 FURADAN 4F, 0.50’ FO570,0.017 BAYTHROID 2E, 0.025 BAYTHROID 2E, 0.0359 WARRIOR IE, 0.03 WARRIOR 1 E, 0.02 0.0 f 0.0 D 0.1 ?: 0.1 c 0.2 + 0.1 BC 0.8 f 0.8 ABCD 0.1 f 0.1 c 0.1 f 0.1 BC 0.3 f 0.1 CD 0.5 f 0.2 c 0.2 f 0.2 BC 0.8 f 0.2 ABCD 0.6 f 0.4 C 0.3 f 0.3 BC 0.6 f 0.4 BCD 0.6 f 0.1 C 0.3 f 0.1 BC 0.2 k 0.1 CD 0.7 f 0.3 c 0.3 f 0.2 BC 0.1 f 0.0 D 0.8 f 0.3 C 0.3 f 0.1 BC 0.8 f 0.1 ABCD 0.8 f 0.2 C 0.2 f 0.0 BC 0.3 f 0.2 CD 1 .o f 0.3 c 0.2 f 0.1 BC 0.2 f 0.1 CD 1.1 io.4c 0.1 * 0.0 c 1.3 f 0.2 ABC 2.7 f 0.3 B 0.7 + 0.1 ABC 0.7 f 0.1 ABCD 3.3 f 0.9 B 1.51tO.5A 0.9 f 0.3 ABCD 4.1 f 0.7 B 1.6 f 0.4 A 1.7fO.l AB 4.3 f 0.8 B 1.6 f 0.4 A 1.9 f 0.3 A 7.5 f 2.1 A 1.1 f0.4AB F Value 4.23 16.34 6.34 P’F < 0.0001 < 0.0001 < 0.0001

‘SEM. standard error of the mean. Means in the same column followed by the same letter(s) are not statistically different, SNK (u=O.O5) ‘Treatment repeated (8 replicates rather than 4) for purposes of measuring yield.

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Table 3. Control of pea aphids, ARDEC, Fort Collins, CO, 2001.

PEA APHIDS PER SWEEP f SEM’

PRODUCT, LB(AI)/ACRE 1 WEEK 2 WEEKS 3 WEEKS

STEWARD, 0.065 FO570,0.017 (EARLY) WARRIOR 1 E, 0.02 (EARLY) UNTREATED CONTROL’ STEWARD, 0.110 FURADAN 4F, 0.25 BAYTHROID 2E, 0.025 BAYTHROID 2E, 0.0359 LORSBAN 4E, 0.75 LANNATE LV, 0.90

FURADAN 4F, 0.50 + DIMETHOATE 4E. 0.25 FO570,0.017 WARRIOR 1 E, 0.03 FURADAN 4F, 0.50’ WARRIOR 1 E, 0.02 4.8 f 1.6 A 4.9 f 2.4 A 3.2 f 1.1 AB 2.8 f 0.7 ABC 2.6 f 1.3 ABCD 1.2 f 0.5 BCD 0.9 f 0.6 CD 0.5iO.3 D 0.4f0.2 D 0.4 f 0.1 D 0.3 j: 0.1 D 0.3 + 0.1 D 0.2 + 0.1 D 0.2 f 0.1 D 0.2 f 0.1 D 5.6 f 2.7 A 6.0 f 2.4 A 6.4 f 3.8 A 3.8 f 1.0 A 6.1 f 3.3 A 2.9f 1.6A 2.5~ 1.1 A 2.4 f 0.6 A 2.0 f 0.6 A 3.4 f 0.9 A 1.2 f0.2 A 1.8*0.7A 0.7 f 0.2 A 1.9 f 0.4 A 1.3*0.4A 1.5*0.5A 1.6 f 0.4 A 2.7k 1.9A 0.6 f 0.3 A 2.5 k 0.7 A 2.3 f 0.4 A 2.0 f 0.8 A 2.3i1.4A 1.4 f 0.4 A 0.4 fO.l A 0.5 f 0.1 A 1.7fO.l A 0.5 k 0.2 A 1.2 f 0.3 A 0.9 f 0.2 A F Value 7.95 2.16 2.63 P’F < 0.0001 0.0246 c 0.0001

‘SEM, standard error of the mean. Means in the same column followed by the same letter(s) are not statistically different. SNK (a=O.OS) ZTreatment repeated (8 replicates rather than 4) for purposes of measuring yield.

CONTROL OF WESTERN CORN ROOT-WORM IN CORN, ARDEC, FORT COLLINS, CO, 2001 Shawn Walter, Jeff Rudolph, Terri Randolph, Jesse Stubbs, Alicia Bosley, Silas Davidson, Frank Peaks, Department of Bioagricultural Sciences and Pest Management

CONTROL OF WESTERN CORN ROOTWORM IN CORN, ARDEC, FORT COLLINS, CO, 2001: Planting time treatments were applied on 15 May 2001. Granular insecticides were applied with modified Wintersteiger meters mounted on a two-row John Deere Maxi-Merge planter. In-furrow granular applications were applied by directing a drop tube into the seed furrow. T-band granular applications were applied with a 4-inch John Deere spreader located between the disk openers and the press wheel. Liquid insecticides were applied with a CO, powered applicator mounted on the planter. In-furrow liquid applications were applied through micro tubes directed into the seed furrow % inch above the seed. T-band liquid applications were applied with a 80” nozzle held 2 inches above the seed slot located between the disk openers and the press wheel. Plots were one 50-ft row arranged in six replicates of a randomized complete block design.

Cultivation treatments were applied on 18 June 2001. All cultivation treatments were applied with 6 inch Gandy spreaders held 2 inches above the plant, incorporated with a modified ditcher with Hawkens ditcher units. Plots

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were one 50-ft row arranged in six replicates of a randomized complete block design.

The seed treatment was hand planted on 16 May 2001 at a plant population of 34,000 per acre. Plots were one 50-ft row arranged in six replicates of a randomized complete block design.

Treatments were evaluated by digging three consecutive plants per plot on 16 July 2001. The roots were washed and the damage rated on the Iowa l-6 scale (Witkowski. J.F., D.L. Keith and Z.B. Mayo. 1982. Evaluating corn rootworm soil insecticide performance. University of Nebraska Cooperative Extension NebGuide G82-597. 2 pp.). Plot means were used for analysis of variance and mean separation by the Student-Neuman-Keuls test (a=0.05). Treatment efficiency was determined as the percentage of total plants per treatment with a root rating of 3.0 or

lower. Plots were hand harvested and yields converted to bushels per acre. Yields were not adjusted by subsample moisture due to equipment failure. Treated plots were compared to the untreated control using a two-tailed t-test with assumed equal variance (a=0.05).

Western corn rootworm pressure was moderate. All planting time treatments and the seed treatment had less damage than the untreated control. Counter 15G cultivation treatment had less damage than the untreated control. No phytotoxicity was observed with any treatment.

Planting time Counter 20CR treatments yielded 157 bushels/acre, 10.5% more than the untreated plots which yielded 127 bushels/acre. The difference was significant (two-tailed t-test, t=2.49, df=22, p(t>t,& =0.0206 ). Yield reduction measured between 1987-2001 have averaged 15%, with a range of 0% to 31%. Plots were hand harvested and did not take into account any losses due to lodging.

Field History Pest: Cultivar: Planting Date: Plant Population: Irrigation: Crop History: Herbicide: Insecticide: Fertilization: Soil Type: Location:

Western corn rootworm, Diabmfica virgifera vifgifera LeConte Pioneer ‘37H26

15-I 6 May 2001 25,000

furrow Corn in 2000

Harness Extra, 2 qffacre, Banvel, lpffacre on 2 April 2001 None prior to experiment

150N,50P

Clay loam, OM 2.4%, pH 7.8

ARDEC, 4616 North Frontage Road, Fort Collins, CO 80524 (west edge of Block 3300)

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Table 1. Control of western corn rootworm with planting treatments, ARDEC, Fort Collins, 2001

PRODUCT RATE’ VOLUME PLACEMENT2 ROOT

RATING’ EFFICIENCY4 FORCE 3G COUNTER 20CR AZTEC 2.1G AZTEC 2.1G FORCE 3G CAPTURE 2E CAPTURE 1.5 G CAPTURE 2E CAPTURE 1.5 G LORSBAN 15G CLOTHIANDIN 600FS UNTREATED CONTROL F Value 4 oz 6 oz 5.0 oz 6.7 oz 4 oz 0.30 fl oz 8 oz 0.30 fl oz 8 oz 8 oz 1.25 mglkernel - - - - 3.3 gal/at - 3.3 gallac - - - - T-Band T-Band T-Band T-Band In-furrow In-furrow T-Band T-Band In-furrow T-Band Seed Treatment - 2.5 B 100 2.,5 B 97 2.,6 B 100 2.,6 B 94 2,,6 B 94 2.,8 B 83 2,,8 B 83 2,.9 B 78 3,.0 B 72 3,.0 B 78 3.1 B 67 4.3A 11 19.09 - P’F < 0.0001 -

‘ounces of prcduct per 1000 row feet ?F. in furrow; TS. t-band.

310wa I-6 rootworm damage scale. Means in the same column followed by the same letter(s) are not statistically different. SNK (a=O.O5). %ercentage of 16 plants (total in 6 replicates of a treatment) with a rating of 3.0 or less.

Table 2. Control of western corn rootworm with cultivation treatments, ARDEC. Fort Collins, 2001

PRODUCT RATE PLACEMENT ROOT RATING’ EFFICIENCYZ

COUNTER 15G 8 oz Banded 2.3 C 100 THIMET 20G 6 oz Banded 2.7 BC 83 LORSBAN 15G 8 oz Banded 2.8 BC 78 UNTREATED CONTROL - - 3.1 AB 67 CAPTURE 1.5 G 8 oz Banded 3.6 A 28 F Value 6.43 - P’F 0.0017 -

‘Iowa l-6 rootworm damage scale. Means in the fame column followed by the same letter(s) are not Statistically different. SNK (a=0.05). 2Percentage of 16 plants (total in 6 replicates of a treatment) with a rating of 3.0 or less.

(15)

CONTROL OF BANKS GRASS MITE IN CORN WITH HAND-APPLIED INSECTICIDES, ARDEC, FORT COLLINS, CO, 2001

Shawn Walter, Silas Davidson, Tern Randolph, Jeff Rudolph, Jesse Stubbs, Alicia Bosley, Frank Peairs, Department of Bioagricultural Sciences and Pest Management

CONTROL OF BANKS GRASS MITE IN CORN WITH HAND-APPLIED INSECTICIDES, ARDEC, FORT

COLLINS, CO, 2001: The early treatment was applied on 1 August 2001 using a 2 row boom sprayer mounted on a backpack calibrated to deliver 17.8 gal/acre at 32 psi with two 8002VS drop nozzles per row. All other

treatments were applied on 8 August 2001. Conditions were clear with wind from the northwest at 3-5 mph and 70°F temperature at the time of the early treatment. Conditions were partly cloudy with wind from the northwest at O-3 mph and 65°F temperature at the time of the late treatments. Plots were 25 ft by two rows (30 inch centers) and were arranged in four replicates of a randomized complete block design. Plots were separated from neighboring plots by a single buffer row. Plots were infested on 11 July 2001 by laying mite infested corn leaves across the corn plants on which mites were to be counted.

Treatments were evaluated by collecting three leaves (ear leaf, 2”d leaf above the ear, 2nd leaf below the ear) from two plants per plot one day prior and one, two and three weeks afler late treatments. Corn leaves were placed in Berlese funnels for 48 hours to extract mites into alcohol for counting. All extracted mites were counted including males and juveniles. Precounts made on 7 August 2001 averaged 769.3 f 68.3 mites per leaf. Mite counts and mite days (calculated by the method of Ruppel, J. Econ. Entomol. 76: 375-377) were transformed by the log + Z method prior to analysis of variance and means separation by the Student-Neuman-Keul method (a=0.05). Reductions in mite days were calculated by Abbott’s (1925) formula: (percent reduction =

((untreated-treated)/untreated) X 100). Original mite counts at one, two and three weeks afler the precounts and mite days accumulated are presented in the table.

Mite densities were very high. Capture 2E + dimethoate 4E and Capture 2E + Lorsban 4E treatments had fewer mites than the untreated control at 1 week after treatment. Capture 2E + dimethoate 4E. Capture 2E + Lorsban 4E, Furadan 4F + dimethoate 4E. Agrimek 0.15EC and Capture 2E treatments had fewer mites than the untreated control at 2 weeks after treatment. Agrimek 0.15EC had fewer mites than the untreated control at 3 weeks after treatment. No treatments had fewer mite days than the untreated control. No phytotoxicity was observed with any treatment.

Field History

Pest: Banks grass mite, Oligonychus pratensis (Banks)

Cultivar: Pioneer ‘37H26 Planting Date: Plant Population: Irrigation: Crop History: Herbicide: Insecticide: Fertilization: Soil Type: Location: 1 May 2001 25,000

Linear move sprinkler with drop nozzles Continuous corn 11 years

Accent, 213 oz/acre + Banvel, % pffacre + NIS. 0.25% on 7 June 2001; Roundup Ultra, 2.0 qffacre + Amine 4, % to 1 pt/acre on 21 August 2001;

Force 3G. 402/1000 row feet for western corn root-worm control 210 N

Sandy clay loam, OM 2.0%, pH 7.9

ARDEC, 4616 North Frontage Road, Fort Collins, CO 80524 (south side of Block 1080)

(16)

Table I, Control of corn spider mites with hand-applied insecticides, ARDEC, Fort Collins, CO, 2001. MITES PER LEAF f SEM ’

PRODUCT, LB (AI)/ACRE 1 WEEK 2 WEEKS 3 WEEKS TOTAL MITE DAYS % REDUCTION’

AGRIMEK O.l5EC, 20 02 PRODUCT/ACRE 51.8 f 9.3 ABC 43.9 f 14.5 B 42.1 f 21.5 B 6438 f 1678 7 AGRIMEK O.l5EC, 10 02 PRODUCT/ACRE 114.5 f 22.6 ABC 114.6 f 53.1 AB 39.4 f 7.2 AB 4127*977 40 CAPTURE 2E + DIMETHOATE 4E, 0.08 + 0.50 39.7 f 11.2 c 52.8 f 19.3 B 73.1 f 43.7 AB 5015f807 28 COMITE II 6E + DIMETHOATE 4E, 1.69 + 0.50 64.5 f 26.0 ABC 105.3 f 30.9 AB 77.1 f 27.3 AB 3016i851 56

COMITE II 8E, 1.69 (early) 107.6 f 47.2 ABC 134.3 f 29.5 AB 69.1 f 17.2 AB 3602 f 840 48

CAPTURE 2E, 0.08 73.3 f 40.5 ABC 45.5 i 10.9 B 85.0 f 27.2 AB 3840+1119 47

FURADAN 4F, 1 .OO 51.5 f 10.0 ABC 101 .O f 45.8 AB 90.9 f 27.1 AB 5259 f 925 24

CAPTURE 2E + LORSBAN 4E, 0.08 + 0.50 35.4*11.7c 39.3 i.7.9 B 118.1 k63.8AB 3692 f 830 47

COMITE II 6E, 2.53 123.8 f 46.5 ABC 104.7k35.0AB 101.1 f24.9AB 4464 f 1069 36

FURADAN 4F + DIMETHOATE 4E, 1 .OO + 0.50 45.9 f 13.3 BC 50.2 f 18.9 B 104.6 f 19.6 AB 4959 f 1055 28

DIMETHOATE 4E, 0.50 78.9 f 26.9 ABC 125.6 f 37.8 AB 162.2 f 52.8 AB 4788 f 1494 31

COMITE II 6E, 2.53 + UCCA1596 (2 pt 119.8 f 38.6 ABC 75.2 f 10.9 AB 185.7 f 74.2 AB 4452 f 848 36 product/acre)

COMITE II 6E, 2.53 + UCCA1596 (1.5 pt 221.4 f 65.6 AB 110.9i 11.1 AB 221.6 f 56.3 A 5853 f 978 16 producffacre)

UNTREATED 235.9 f 27.9 A 338.8 f 75.3 A 273.5 k 61.2A 6931 f 550 -

F Value 3.23 3.3i 2.43 ^ ^^ U.Y1s

P’F 0.0023 0.0019 0.0164

‘SEM, standard error of the mean. Means in the same column followed by the same letter(s) are not statistically different, SNK ( ~0.05). ‘Percent reduction in total mite days. calculated by the Ruppel method.

0.4884

(17)

Pest: Cultivar: Planting Date: Plant Population: Irrigation: Crop History: insecticide: Fertilization: Location:

CONTROL OF WESTERN BEAN CUTWORM WITH HAND APPLIED INSECTICIDES, LEGG FARMS, HAXTUN, CO, 2001

Jeff Rudolph, Terri Randolph, Shawn Walter, Frank Peairs, Department of Bioagricultural Sciences and Pest Management, Colorado State University; Assefa GabreAmlak Golden Plains Area Cooperative Extension CONTROL OF WESTERN BEAN CUTWORM WITH HAND APPLIED INSECTICIDES, LEGG FARMS, HAXTUN, CO, 2001: Treatments were applied on 3 August 2001 using a 2 row boom sprayer mounted on a backpack calibrated to deliver 17.8 gal/acre at 32 psi with two 8002VS drop nozzles per row. Conditions ware clear with calm winds and air temperature of 80°F. Plots were 50 ft by two rows and were arranged in four replicates of a randomized complete block design. Untreated control and Pounce 3.2E plots were replicated eight times for a more accurate comparison of treatment effects on yield. Plots were separated from neighboring plots by a single buffer row. Crop stage at application was milk.

At the time of application, 20% of the plants had egg masses. Colorado State University research trials have shown that economic injury with western bean cutworm generally occurs when 7% of plants have egg masses and the crop is 95% tasseled. With a plant population of 30,000 this infestation level should result in approximately one larva per ear.

Treatments were evaluated by counting the number of western bean cutworm larvae in the ears of 25 consecutive plants per plot on 23 August 2001. Counts were transformed by the square root + % method prior to analysis of variance and means separation by the Student-Neuman-Keul method (a=0.05). Original counts are presented in the table.

No treatments had fewer western bean cutworm than the untreated control. There were no differences among treatments (Table 1). The lack of significant treatment effects may be that treatments were applied after

pollenation when the larvae had already entered the ear, or because of low densities in the untreated control. No phytotoxicity was observed with any treatment. i

Pounce 3.2E treatments yielded 2.3% less than the untreated plots. The difference was not significant (two-tailed t-test, t=-0.56, df=14. p(t>&,) =0.5817 ).

Field History

Western bean cutworm. Richia albicosfa (Smith) Pioneer 35R37

18 May 2001 17,000 Dryland Wheat in 2000

None prior to experiment 47 N, 22 P, 6 S

Phillips County, southwest corner of Highway 8 and County Road 6

(18)

Table I. Control of western bean cutworm with hand applied insecticides, Legg Farm, Iiaxtun, CO, 2001.

PRODUCT, LB (AI)/ACRE WBC LARVAE/PLANT WBC % CEW LARVAE/PLANT

* SEM’ CONTROL f SEM’

F5070 0.8 EW, 0.015 INTREPID 2F, 0.06 + LATRON CS-7,0.12%v/v POUNCE 3.2E, 0.05 CAPTURE 2E, 0.033 WARRIOR T 1 .O. 0.015 ASANA XL 0.66, 0.015 UNTREATED CONTROL 0.01 f 0.01 A 95 0.07 k 0.03 A 0.03 f 0.02 A 84 0.09 f 0.05 A 0.05 f 0.03 A 74 0.08 f 0.02 A 0.05 f 0.04 A 74 0.04 f 0.02 A 0.06 f 0.03 A 68 0.03 f 0.02 A 0.08 f 0.04 A 58 0.06 f 0.04 A 0.20 f 0.04 A - 0.13 f 0.02 A F value 3.69 - 2.84 P’F 0.0073 - 0.0261

‘SEW standard error of the mean. Means in the same column followed by the same letter(s) are not statistically different. SNK (0=0.05).

(19)

THE 2001 GOLDEN PLAINS PEST SURVEY PROGRAM

The Golden Plains Pest Survey Program monitors economically significant insects in the Golden Plains Area through field scouting and the use of light and pheromone traps. It is sponsored solely through donations by area growers and other members of the agriculture industry. Scouting-based integrated pest management information is provided weekly to subscribers through newsletters, news releases to 24 area newspapers, radio broadcasts (The What’s Bugging You Report) on 5 local radio stations, the Fan DaytalDTN Network and the World Wide Web. This year’s Golden Plains Pest Survey Program was coordinated by Barney Filla, Soil and Crop Sciences student attending Colorado State University.

We would like to thank the following individuals for their support and dedication to making this year’s pest survey a

2001 Light Trap Operators

Bonny Dam Bill Cody Jr. and Family Burlington Dale Hansen

Eckley Merle and Hazel Gardner Holyoke Scott Korte

Kirk Gene Nelson

Wauneta Kylie Lenz

Wray Gleason Dryden

Yuma Irrigated Research Farm

t

2001 Pest Survey Committee Allan Brax Bill Brown Frank Peairs JackRhodes Dave Green Gene Kleve Bill Cody Mike Fecht Merlin Van Deraa Mike Ferrari John Kreidler Ron Meyer Randy Haarberg

(20)

Contributors to the 2001 Golden Plains Pest Survey Program

Akron: Birdsall Young, Jr., Glenn Baker, John Hickert, Hickert Land Company Jim Tomky. Keith Rodeman

Pat Hornung Amherst: Arapahoe: Arriba: Bayard, NE: Benkelman, NE: Bethune: Brush: Burlington: Cope: Dalton, NE: Eaton: Eckley: Elsie, NE: Enders, NE: Flagler: Fleming: Gering, NE: Goodland, KS: Grant, NE: Greeley: Haigler, NE: Haxtun:

Hays Springs, NE: Hemingford, NE:

Darrel Lehrkamp (Tri-Me Spraying Service) Larry Kildow

Doran Jesse, Indian Creek Scouting

Ken Hildenbrandt (Warrior Aviation), Jack Lowe David Wagers

Schutte Farms, Louis Nider (Nider Farms), Bill D. Hinkhouse. Dale Hansen, Larry Feldhousen, Berry Hinkhouse, John Mauch (Wilcox Oil & Chemical, Inc.), Clayton Smith, Gary Mulch, Ryan Weaver, Clay Smith (High Plains Ag Service, Inc.). Golden Harvest, Servi-Tech, John Fortmeyer

Ed and Ellen Cecil (Cecil Ranch), Jim Cecil, Sackett’s Inc Ted, Kyle and Kathy Watachom

FMC Ag Products Group

Ted Tuell (Tuellland Inc.), Max Schafer, Merle & Hazel Gardner (Spittoon Ranch), Kathy Wenger

Dick Leonard Terry Bilka

Dallas Saffer (Flagler Aerial Spraying lnc), Flaglers Farmers Co-op Jim Atkin (Atkin Seed)

Tim Wolf. UAP Pueblo

Mark McGreer, Appel Crop Consulting, Inc

Bayer, Inc., UAP Pueblo, Bill Curran, Livestock Products Jerry Olsen (Dundy Ag Service, Inc)

Dennis Eckman, Pioneer Seeds, Larry Anderson (Zion Farms), Servi-Tech. Quentin Biesemeier, Lauren Heermann

Steve Sandberg Dave Engel

(21)

Holyoke: Idalia: Imperial, NE: Joe-s: Julesburg: Kimball, NE: Kirk: Lamar, NE: Lodgepole, NE: Loveland: McDonald, KS: Melbeta, NE: Morrill, NE: North Platte, NE: Ogallala, NE: Otis: Scottsbluff, NE: Sterling: Stratton: Tribune, KS: Vernon: Wheatland, WY: Wray: Yuma:

2001 FIELD CROP INSECT MANAGEMENT - 18

Richard Elnspahr, Lenz Farms, Jack Rhodes, Shawn Dalton, Erik Vieselmeyer (American Cyanamid), Gary Korte, Servi-Tech

Larry Allen (Allen Grain), Vision Seed & Supply Rod Johnson (R-Nette Inc.)

Randy Haarberg (Haarberg Consulting, Inc.), Kenneth Schneider, Richard Schneider (Schneider Farms Inc,)

Bruce Holcomb Jack Cochran

Darrell Idler (Idler Brothers), James Idler (Idler Brothers), Ervin Frank (Frank Farms), Todd Frank (Frank & Nelson), Kent Ficken, First National Bank of Kirk, Desel Collette Kent Miller

Mike Behrends

Monsanto, FMC Corporation C. W. Antholz

Ty Marker

Gordon Strauch, Jerry Dillman Matt Hasenauer

Pioneer Hi-Bred, Guy Jones

Steve Perry, Gene Perry, Perry Bros. Seed, Ken Melendy, Richard Lewton (Lewton Farms), Harlan & Donita Schaffert, Calvin Schaffert, Schafferf Farms

Bill Rexus

Frank Molinaro (Ag. Crop Services)

Stratton Equity Co-op. Servi-Tech, Kenneth McArthur Crop Quest

Duaine and Wanda Dodsworth Dan Melcher

Len2 Farms, Dwight Rockwell, Larry Gradner, Stalk Inc., Alan Welp, Servi-Tech, Phil QsmUS, PMC West Crop Consulting, Dennis Atwell, Jim Bowman, Durad Fix

Terra Firma Ag Consulting, Yuma Ag Service, Carroll Josh, Grand Valley Hybrids, Irrigated Research Foundation, Servi-Tech, Don 8, Peg Brown, Kevin Koenig, Eugene Beauprez, JR Unger, Scott Wall

(22)

SUMMARY OF 2001 LIGHT AND SUCTION TRAP CATCHES

The following graphs compare the 2001 European corn borer and western bean cutworm moth flights with the historical average moth flight (including 2001) by geographic location. Geographic location is defined as a 10 square mile area. The number of years contributing to the historical average ranges between 5 and 15. European Corn Borer Moth Flight

First generation European corn borer moth flight began the week of 6 June and peaked the week of 13 June in most locations. Bonny Dam and Eckley had higher trap captures of first generation European corn borer moths compared to the historical average. Holyoke, Wauneta and Yuma had lower trap captures of first generation moths.

Second generation flight peaked the week of 6 August in most locations. Bonny Dam, 13urlington Eckley, Holyoke, Wauneta and Wray had high trap captures of second generation European corn borer moths compared to the historical average. Kirk had lower trap captures of second generation moths,

Western Bean Cutworm

Western bean cutworm moth flight activity began the week of 4 July and peaked the week of 25 July in most locations. All locations with the exception of Burlington and Yuma had high trap captures of western bean cutworm moths compared to the historical average.

Note that the y-axis scale changes from graph to graph (number of moths caught per week).

(23)

Table 1. Russian wheat aphid suction trap results at four Colorado locations, 1967-2001,

AKRON BRIGGSDALE’ LAMAR WALSH

1987 - 1632 - 392 1988 172 92 0 4636 1989 177 102 112 5003 1990 1234 1353 1315 1275 1991 79 1679 1992 166 1685 1993 7 2 1994 496 867 1995 73 322 1996 66 502 1997 301 216 1998 36 550 1999 1257 573 2000 121 430 2001 0 5 703 0 69 84 700 1 1775 - - 40 883 789 374 3216 361 - 2501 31 257 140 2

‘Trap moved to ARDEC (Agricultural Research, Development and Education Center, Colorado State University, Fort Collins, CO) from Sriggsdale in 1990. Trap moved back to another location near Sriggsdale in 1999.

(24)

2001 Golden Plains Pest Survey

European corn borer flight - Bonny Dam

Week of moth tlight

European corn borer flight - Burlington

Week of moth flight

2001 FIELD CROP INSECT MANAGEMENT - 21 ‘!

700

(25)

European corn borer flight - Eckley

European corn borer flight - Holyoke

-2 -1 12 3 4 5 6 7 8

Weak of moth flight

(26)

European corn borer flight - Kirk

Week of moth flight

European corn borer flight - Wauneta

Week of moth flight

(27)

European corn borer flight - Wray

Week of moth flight

I I

2001 Golden Plains Pest Suwey

European corn borer flight - Yuma

Week of moth flight

(28)

Western bean cutworm flight - Bonny Dam

Week of moth flight

Western bean cutwom-~ flight - Burlington

3 4 5

Week of mdh Right

(29)

Western bean cutworm flight - Eckley

6000

o-Y?--‘?

_..-

-5 -1 i

i

3 4 5

Week of moth flight

Western bean cutworm flight - Holyoke

L

(30)

Western bean cutworm flight - Kirk

Western been cutworm flight

- Wauneta

1

0.~

1 -z-r

J

,’

1 4 5 6 7 8 9

’

ii) 13

Week of moth Aigth

2001 FIELD CROP INSECT MANAGEMENT - 27

(31)

Western bean cuhvom~ flight - Yuma

Week of moth flight

(32)

Insecticide performance in a single experiment can be quite misleading. To aid in the interpretation of the tests included in this report, long term performance summaries for insecticides reoistered for use in Colorado are presented below. These summaries are complete through 2001.

Table 1. Performance of planting-time insecticides against western corn rootworm, 1987-2001, in northern Colorado

INSECTICIDE IOWA I-8 ROOT RATING’

AZTEC 2.1G 2.6 (23) COUNTER 15G 2.6 (25) COUNTER 20CR 2.6 (36) DYFONATE 20G 2.8 (12) FORCE 1.5G (8 02) or 3G (4 02) 2.7 (27) FORTRESS 5G 2.8 (14) LORSBAN 15G 3.0 (19) REGENT 4SC. 3-5 GPA 3.0 (5) THIMET 20G 3.4 (15) UNTREATED CONTROL 4.2 (27)

‘Rated on a scale of 1-6, where 1 is least damaged, and 6 is most heavily damaged. Number in parenthesis is number of times tested for average. Planting time treatments averaged over application methods.

Table 2. Performance of cultivation insecticide treatments against western corn rootworm, 1987-2001, in northern

INSECTICIDE IOWA 1-6 ROOT RATING’

COUNTER 15G 2.7 (17)

DYFONATE 20G 3.1 (9)

FORCE 1.5G or 3G 3.2 (7)

FURADAN 4F, 2.4 OZ. BANDED OVER WHORL 3.2 (12)

FURADAN 4F, 1 .O, INCORPORATED 3.3 (3)

LORSBAN 15G 3.1 (13)

THIMET 20G 2.9 (17)

UNTREATED CONTROL 4.3 (21)

‘Rated on a scale of l-6. where 1 is least damaged. and 6 is mast heavily damaged. Number in () is number of times tested for average. Planting time treatments averaged c~arapplication methods.

(33)

Table 3. Insecticide performance against first generation European corn borer, 1982-2001, in northeast Colorado.

MATERIAL LB/ACRE METHOD’ % CONTROL’

DIPEL IOG 10.00 A _{88 (4)} DIPEL 1 OG DIPEL ES LORSBAN 15G LORSBAN 15G LORSBAN 4E POUNCE 3.2E POUNCE 1.5G POUNCE 1.5G THIMET 20G THIMET 20G 10.00 1 QT + OIL 1 .OO (Al) 1 .OO (Al) 1 .O (Al) 0.15 (Al) 0.15 (Al) 0.15 (Al) 1 .OO (Al) 1 .OO (Al) C I A C I I C A C A 84 (2) 91 (4) 77 (5) 80 (‘3) 87 (9) 88 (11) 87 (4) 73 (7) 77 (4) 73 (3) WARRIOR 1 E 0.03 (Al I _{85 (4)}

‘A = Aerial. C = Cultivator, I = Center Pivot Injection. CSU does not recommend the use of aerially-applied liquids for control of first qenemtion European corn borer.

Numbers in () indicate that percent control is the average of that many trials.

Table 4. Insecticide performance against western bean cutworm, 1982-2001, in northeast Colorado.

MATERIAL LB (AI)/ACRE METHOD’ % CONTROL’

AMBUSH 2E AMBUSH 2E CAPTURE 2E CAPTURE 2E LORSBAN 4E LORSBAN 4E POUNCE 3.2E POUNCE 3.2E 0.05 A 0.05 I 0.08 A 0.08 I 0.75 A 0.75 I 0.05 A 0.05 I

$39

(2)

99

(2) 98 (5) 98 (5) 88 (4) 94 (4) 97 (7) 99 (5) WARRIOR 1 E (T) 0.02 I _{96 (2)}

‘A = Aerial. I = Center Pivot Injection

‘Numbers in () indicated that percent control is average of that many trials.

(34)

Table 5. Insecticide performance against second generation European corn borer, 1982-2001. in northeast Colorado.

MATERIAL LB (AI)/ACRE METHOD’ % CONTROL’

DIPEL ES 1 QT PRODUCT

CAPTURE 2E 0.08

FURADAN 4F 1.00

LORSBAN 4E 1.00

LORSBAN 4E 1 .oo + OIL

PENNCAP M 1 .oo PENNCAP M 1.00 POUNCE 3.2E 0.15 56 (16) 85 (8) 86 (14) 62 (‘3 41 (6) 72 (14) 74 (7) 74 (8) 74 (11) WARRIOR 1 E 0.03 A _{81 (4)} WARRIOR 1 E 0.03 I _{78 (4)}

‘A = Aerial, I = Center Pivot Injetion

‘Numbers in () indicate how many trials are averaged.

Table 6. Performance of hand-applied insecticides against alfalfa weevil larvae, 1984-2001, in northern Colorado.

PRODUCT LB (AI)/ACRE % CONTROL AT 2 WK’

BAYTHROID 2E 0.025 96 (9) FURADAN 4F 0.25 87 (12) FURADAN 4F 0.50 92 (22) LORSBAN 4E 0.75 93 (14) LORSBAN 4E 1 .oo 96 (6) LORSBAN 4E 0.50 83 (10) PENNCAP M 0.75 84 (11) PERMETHRIN 2 0.10 67 (7) PERMETHRIN ’ 0.20 86 (4) WARRIOR 1 E 0.02 97 (12)

‘Number in () indicates number of years included in average. 21ndudes boti Ambush 2E and Pounce 3.2E.

(35)

Table 7. Control of Russian wheat aphid with hand-applied insecticides in winter wheat, 1988-2001’.

PRODUCT LB (AI)/ACRE TESTS WITH > 90%

CONTROL TOTAL TESTS % TESTS

LORSBAN 4E DI-SYSTON 8E DIMETHOATE 4E DI-SYSTON 8E PENNCAP M LORSBAN 4E THIODAN 3E WARRIOR 1 E or T

‘Includes data from several states.

0.50 21 37 57 0.75 14 39 36 0.375 7 32 22 0.50 2 10 20 0.75 3 19 16 0.25 5 19 26 0.50 1 4 25 0.03 2 12 17

Table 8. Control of spider mites in artificially-infested corn with hand-applied insecticides, ARDEC, 1993-2001.

PRODUCT LB (y/ACRE % REDUCTION IN TOTAL MITE DAYS’

CAPTURE 2E 0.08 58 (9) CAPTURE 2E + DIMETHOATE 4E 0.08 + 0.50 67 (9) CAPTURE 2E + FURADAN 4F 0.08 + 0.50 66 (4) COMITE II 1.64 29 k-9 COMITE II 2.53 51 (4) COMITE II + DIMETHOATE 4E 1.64 + 0.50 60 (6) DIMETHOATE 4E 0.50 52 (9) FURADAN 4F 1 .oo 42 (9)

FURADAN 4F + DIMETHOATE 4E 1 .oo + 0.50

‘Number in () indicates number of tests represented in average.

51 (4)

Table 9. Control of sunflower stem weevil with planting and cultivation treatments, USDA Central Great Plains Research Station, 1998-2001.

PRODUCT LB (AI)/ACRE TIMING % CONTROL’

BAYTHROID 2E 0.02 CULTIVATION 57 (3) BAYTHROID 2E 0.03 CULTIVATION 52 (3) FURADAN 4F 0.75 CULTIVATION 61 (3) FURADAN 4F 1 .o PLANTING 91 (3) FURADAN 4F 1.0 CULTIVATION 83 (3) WARRIOR 1 E 0.02 CULTIVATION 63 (3) WARRIOR 1 E 0.03

‘Number in () indicates number of tests represented in average.

CULTIVATION _{1 (3)}

(36)

2001 TEST PLOT COOPERATORS

ALFALFA ARDEC Fort Collins

BARLEY Allen Matsuda, Coors Berthoud

L ARDEC Fort Collins

CORN ARDEC Fort Collins

Kenny Legg, Legg Farms Haxtun

SUNFLOWER USDA Central Great Plains Research Station Akron

WHEAT ARDEC Fort Collins

TEST PLOT ASSISTANCE

ARDEC. Reg Koll, Chris Fryrear, Theron Perry Fort Collins

EQUIPMENT MANUFACTURERS

ARDEC, Ed Reynolds Fort Collins

ACKNOWLEDGMENTS

(37)

PRODUCT INDEX AGRIMEK

Manufacturer: Novartis

EPA Registration Number: loo-898

Active ingredient(s) (common name): abamectin ASANA XL

Manufacturer: DuPont

EPA Registration Number: 352-539

Active ingredient(s) (common name): Esfenvalerate AZTEC 2.1G

Manufacturer: Bayer

EPA Registration Number:3125412

Active ingredient(s) (common name): 2% BAY NAT 7484, 0.1% cyftuthrin BAYTHROID 2E

Manufacturer: Bayer

EPA Registration Number: 3125351

Active ingredient(s) (common name): cyfluthrin CAPTURE 2E

Manufacturer: FMC

Active ingredient(s) (common name): bifenthrin CAPTURE 1.5 G

Manufacturer: FMC

EPA Registration Number: experimental Active ingredient(s) (common name): bifenthrin CLOTHIANDIN 600FS

Manufacturer: Bayer

EPA Registration Number: experimental

Active ingredient(s) (common name): clothiandin COMITE II

Manufacturer: Uniroyal

Active ingredient(s) (common name): propargite COUNTER 15G

Manufacturer: Cyanamid

Active ingredient(s) (common name): terbufos COUNTER 20CR

Manufacturer: Cyanamid

Active ingredient(s) (common name): terbufos DIMETHOATE 4E

Manufacturer: generic

Active ingredient(s) (common name): dimethoate

... ... ... ... ... ... ... ... ... ... ... ... l&13 ... 15 ... 11 ... 7-9 2,1t-13,15 ... 11 ... 11 ... 13 ... IO,11 ... IO,11 1,2,7-g, 12.13

(38)

DI-SYSTON 8E Manufacturer: Bayer

Active ingredient(s) (common name): disulfoton F0517

Manufacturer: FMC

EPA Registration Number: experimental .

Active ingredient(s) (common name): experimental FO570 0.8EW

Manufacturer: FMC

Active ingredient(s) (common name): experimental FORCE 3G

Manufacturer: Zeneca

Active ingredient(s) (common name): tefluthrin FURADAN 4F

Manufacturer: FMC

Active ingredient(s) (common name): carbofuran INTREPID 2F

Manufacturer: Dow AgroSciences EPA Registration Number: 707-277

Active ingredient(s) (common name): methoxyfenozide LANNATE LV

Active ingredient(s) (common name): Methomyl LORSBAN 15G

Manufacturer: Dow Agrosciences EPA Registration Number: 62719-34

Active ingredient(s) (common name): chlorpyrifos LORSBAN 4E

Manufacturer: Dow Agrosciences EPA Registration Number: 62719-220

Active ingredient(s) (common name): chlorpyrifos POUNCE 3.2EC

Manufacturer: FMC

Active ingredient(s) (common name): permethrin STEWARD

. Active ingredient(s) (common name): indoxacarb

... ... ... ... ... ... ... ... ... ... ... ... 6-9, 12, 13 ... I,2 ... 7 ... 2,4, 7-9 ... 11 ... 15 ... 7-9 ... 11 ... I-4,7-9, 12,13 ... 14,15 ... 7-9

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THIMET 20G

Manufacturer: American Cyanamid EPA Registration Number: 241-257

Active ingredient(s) (common name): phorate UCCA1596

Manufacturer:

Active ingredient(s) (common name): sucrose octanote WARRIOR 1 E

Active ingredient(s) (common name): lambda-cyhalothrin WARRIOR T

Active ingredient(s) (common name): lambda-cyhalothrin

... ... ... ... ... ... ... ... ... ... ... ... ... 11 ... 13 ... 7-9 .... 1-5, 15 XR 225 XR 225

Manufacturer: Dow Agroscience Manufacturer: Dow Agroscience

EPA Registration Number: experimental EPA Registration Number: experimental

Active ingredient(s) (common name): cyhalothrin isomer