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Evaluation of Insecticides for Control of Lepidopterous Larvae in Lettuce, 1993

Evaluation of Insecticides for Control of Lepidopterous Larvae in Lettuce, 1993 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/101/4639288 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 101 Mean no . striped Mean no spotted cucumber beetles/ cucumber beetles/ bacterial 6 ft. row 6 ft. row wilt lb Yield 48 lb Treatment (AI)/acre 15 Sep 24 Sep 15 Sep 24 Sep 30 Sep bu/acre Asana XL 0.04 0.00b 0.00b 0.00b 0.00b 1.00a 389.15ab Thiodan 3 EC 1.00 0.50b 0.50ab 0.00b 2.50b 12.90a 322.05b Methoxychlor 2EC 1.75 0.50b 0.00b 1.25b 0.50b 5.50a 329.24b Asana XL prebloom + 0.04 1,50ab 0.25ab 1.00b 0.50b 10.70a 299.78b Thiodan 3EC 1.00 Final sprays Asana XL prebloom+ 0.04 0.00b 0.25ab 0.50b 0.75b 7.30a 369.25ab Methoxychlor 2 EC 1.75 Final sprays Furadan 4F furrow+ 1.00 0.50b 0.00b 0.00b 0.00b 2.40a 456.90ab Asana XL foliar 0.04 Furadan 4F furrow+ 1.00 0.75b 0.25ab 1.00b 1.50b 2.90a 396.34ab Thiodan 3EC foliar 1.00 Furadan 4F furrow+ 1.00 0.00b 0.00b 1.00b 0.75b 6.70a 448.49ab Methoxychlor 2EC 1.75 foliar Furadan 4F furrow+ 1.00 1.00b 0.00b 2.75b 5.50a 18.70a 696.45a Adios foliar 0.07 Lannate 0.45 0.25b 0.25ab 1.25b 2.75b 7.20a 353.66ab Lannate 0.90 0.00b 0.00b 0.75b 1.50b 5.20a 382.18ab Untreated check 2.75a 1.75b 5.75a 5.75a 13.40a 337.43ab Means in a column with a letter in common are not significantly different (P = 0.05, Ryan's Q Test). ,ETTUCE: Lactuca sativae L. 'Empire' J. C. Palumbo and C. H. Mullis (57E) Beet armyworm (BAW); Spodoptera exigua (Hubner) University of Arizona Cabbage looper (CL); Trichoplusia ni (Hubner) Yuma Valley Agric. Center Yuma, AZ 85364 EVALUATION OF INSECTICIDES FOR CONTROL OF LEPIDOPTEROUS LARVAE IN LETTUCE, 1993: Lettuce was direct seeded into double-row beds on 16 Sep at the Yuma Valley Agricultural Center, Yuma, AZ. The plots were not thinned prior to the experiment. Each plot consisted of four, 30 ft long beds spaced 42 inches apart and bordered on each side by an unplanted bed. Plots were arranged in a completely randomized block design with 4 replicates. Foliar treatments were applied on 7 and 12 Oct with a tractor-mounted boom sprayer (2 TX-8 nozzles/row) operated at 40 psi, delivering 20 gal/acre. Spreader-sticker (Dynamic) was included in all spray treatments at a rate of 0.5% of the total volume. Insecticide efficacy was determined by counting the total number of small (1st and 2nd instars) and large (> 2nd instar) BAW and CL larvae on 25 randomly selected lettuce plants per replicate. Insect counts were conducted on 7, 12, and 17 Oct. Data were analyzed for treatment differences using ANOVA and a protected LSD. BAW and CL populations were low-moderate during the experimental period. There were no significant differences in the number of small BAW and CL larvae among the treatments on any sample date. There were no differences among treatments in the number of large BAW on 7 and 12 Oct. All treatments, except Dipel and Agree, contained significantly fewer large BAW than the untreated check after the second application (17 Oct). All treatments significantly reduced the number of CL during the test. No phytotoxicity was observed. Mean number of small BAW per 25 plants Mean number of large BAW per 25 plants Rate (lbs/acre) 7 Oct 12 Oct 17 Oct 7 Oct 17 Oct Treatment 12 Oct Xentari 1.0 ± 0.4 a 0.0 ± 0.0 a 1.0 0.0 1.0 0.2 ± 0.2 a : 0.6 a 0.8 ± 0.5 a t 0.0 b Dipel 1.0 1.0 ± 0.1 a 1.8 ± 1.1 a 0.5 ± 0.3 a 0.8 : 0.5 a 1.3 ± 0.8 a 0.6 t 0.3 ab Agree 1.0 0.8 ± 0.5 a 0.2 ± 0.2 a 0.2 : 0.2 a 0.0 ± 0.0 a 1.3 t 0.5 a 1.8 ± 0.6 a Stalker 0.1 0.1 ± 0.1 a 0.0 ± 0.0 a 1.3 : 0.9 a 0.0 ± 0.0 a 0.0 t 0.0 b 1.7 ± 0.5 a 0.0 Stalker 0.2 0.2 ± 0.2 a ± 0.0 a 1.0 : 0.5 a 0.0 t 0.0 b 2.0 ± 0.4 a 0.0 t 0.0 a 0.0 RH 5992 0.125 1.8 ± 0.6 a 1.3 ± 0.6 a ± 0.0 a 0.8 : 0.8 a 0.0 t 0.0 a 0.0 t 0.0 b 0.0 ± 0.0 a 0.2 0.0 Larvin 0.75 1.0 ± 0.6 a 0.2 ± 0.2 a : 0.2 a 0.0 ± 0.0 a t 0.0 b 0.2 ± 0.0 a 0.0 1.3 Control 2.7 ± 1.5 a 2.8 ± 0.9 a : 0.0 a 1.3 ± 0.8 a t 0.2 a 0.5 tjOU ( 1 us 2.4 2.0 .7 1.3 0.7 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/101/4639288 by DeepDyve user on 02 August 2020 102 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS Mean number of small CL per 25 plants Mean number of large CL per 25 plants Rate (lbs/acre) 7 Oct 12 Oct 17 Oct 7 Oct 12 Oct 17 Oct Treatment 0.0 ± 0.0 a Xentari 1.0 1.0 0.7 a 0.0 ± 0.0 a 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b Dipel 0.8 ± 0.8 a 0.0 ± 0.0 a 1.0 0.0 0.0 a 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b Agree 0.0 ± 0.0 a 0.0 ± 0.0 a 1.0 0.2 0.2 a 0.0 ± 0.0 a 0.2 ± 0.2 b 0.0 ± 0.0 b Stalker 0.0 ± 0.0 a ± 0.0 a 0.1 0.0 0.0 a 0.0 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b Stalker 0.0 ± 0.0 a ± 0.0 a 0.2 0.2 0.2 a 0.0 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b RH 5992 0.125 0.8 0.8 a 0.0 ± 0.0 a ± 0.0 a 0.0 + 0.0 a 0.0 ± 0.0 b 0.0 + 0.0 b 0.0 0.0 ± 0.0 a Larvin 0.75 0.5 0.5 a ± 0.0 a 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b 0.0 0.2 ± 0.2 a Control 0.0 0.0 a 0.5 ± 0.3 a 0.0 ± 0.0 a 1.3 ± 0.8 a 2.3 ± 0.8 a 0.9 0.6 0 0.8 0.9 1.1 ONIONS: Allium cepa L. 'Golden Cascade' M. Davis, W. Pett, and E. Grafius (58E) Onion maggot; Delia antiqua (Meigen) Department of Entomology Michigan State University East Lansing, MI 48824 ONION MAGGOT CONTROL, 1992: Onions were planted at the Brink Farm near Grant, MI on 11 May. Seeds were planted in single rows with a vee-belt seeder with a 1 inch wide shoe. Plots were 20 ft long and were replicated four times with a randomized complete block arrangement. Treatments consisted of sand pelleted seed except for the conventional seed, which was unpelleted. All pelleted treatments except the pelleted seed control also included Progrow (Vitavax + Thiram) in the pellet. On 9 Jun, 100-plant sections (or total plant stand if less than 100 plants) were marked out in each replicate (block). Total plant stand and numbers of injured plants were recorded on 16, 23, 30 Jun, 7 and 16 Jul and 25 Aug. On 25 Aug all plants were cut open and inspected for onion maggot damage. Percent data were arc sine square root transformed before analysis of variance. Plant stand was never significantly different among treatments on any of the sampling dates, although the two Trigard treatments showed the highest stands during the season and at harvest. Bulb damage observed at harvest was lowest in the Lorsban treatment, followed by the two Trigard treatments. Mean % plant Mean % damage Treatment Rate stand at harvest at harve Trigard pelleted seed 50 g Al/kg seed 62.0 a 5.2 ab Trigard 75 g Al/kg seed 67.9 a 3.8 a pelleted seed Pelleted seed + Lorsban 3.7 oz/1000 row ft 50.0 a 1.0 a Pelleted seed (Progrow only) 37.0 a 9.8 b Pelleted seed control 31.0 a 20.5 c Conventional seed 30.7 a 17.4 c Means within the same column and followed by the same letter are not significantly different (Fisher's protected LSD, P < 0.05). ONIONS: Allium cepa L. 'Golden Cascade' M. Davis, E. Grafius, J. McDaniel, and P. Kolarik (59E) Onion maggot; Delia antiqua (Meigen) Department of Entomology Michigan State University East Lansing, MI 48824 ONION MAGGOT CONTROL, 1993: Onions 'Golden Cascade' were seeded at the Brink Farm near Grant Michigan on 4 May in single rows using a vee-belt seeder with a 1-inch wide shoe. Plots were 15 ft long, replicated five times in a randomized complete block arrangement, 12 inches between rows, with untreated buffer rows between each plot. Plots were seeded at 12 seeds per foot, for a total of 180 seeds per plot. There were four seed treatments with Trigard plus three in-furrow insecticide treatments and associated control treatments. Trigard treatments were: a previously tested pellet formulation containing sand, a new pellet containing diatomaceous earth, and a seed coat held on the seed with a thin film coat. Pelleted seed included the fungicide Progrow. Seed film coat treatment and untreated seed included thiram. Lorsban, Dyfonate, and Admire treatments were applied in furrow at planting with thiram-treated seed. Three weeks post-planting, 100 plant sections in each replicate (or the entire replicate if 100 plants were not present) were marked. The number of damaged plants in each 100 plant section were counted weekly from 8 Jun-8 Jul. Final stand counts were made at the end of the season. Observed onion maggot injury summed for all dates was 29.5 to 44.4% in the controls. Injury was less in Lorsban and Dyfonate treatments than in controls. Observed injury in Trigard treatments was 7.6 to 10.2% and significantly lower than the Lorsban treatment or the controls. All Trigard http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Evaluation of Insecticides for Control of Lepidopterous Larvae in Lettuce, 1993

Arthropod Management Tests , Volume 19 (1) – Jan 1, 1994

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Oxford University Press
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© 1994, Entomological Society of America
eISSN
2155-9856
DOI
10.1093/amt/19.1.101
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/19/1/101/4639288 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 101 Mean no . striped Mean no spotted cucumber beetles/ cucumber beetles/ bacterial 6 ft. row 6 ft. row wilt lb Yield 48 lb Treatment (AI)/acre 15 Sep 24 Sep 15 Sep 24 Sep 30 Sep bu/acre Asana XL 0.04 0.00b 0.00b 0.00b 0.00b 1.00a 389.15ab Thiodan 3 EC 1.00 0.50b 0.50ab 0.00b 2.50b 12.90a 322.05b Methoxychlor 2EC 1.75 0.50b 0.00b 1.25b 0.50b 5.50a 329.24b Asana XL prebloom + 0.04 1,50ab 0.25ab 1.00b 0.50b 10.70a 299.78b Thiodan 3EC 1.00 Final sprays Asana XL prebloom+ 0.04 0.00b 0.25ab 0.50b 0.75b 7.30a 369.25ab Methoxychlor 2 EC 1.75 Final sprays Furadan 4F furrow+ 1.00 0.50b 0.00b 0.00b 0.00b 2.40a 456.90ab Asana XL foliar 0.04 Furadan 4F furrow+ 1.00 0.75b 0.25ab 1.00b 1.50b 2.90a 396.34ab Thiodan 3EC foliar 1.00 Furadan 4F furrow+ 1.00 0.00b 0.00b 1.00b 0.75b 6.70a 448.49ab Methoxychlor 2EC 1.75 foliar Furadan 4F furrow+ 1.00 1.00b 0.00b 2.75b 5.50a 18.70a 696.45a Adios foliar 0.07 Lannate 0.45 0.25b 0.25ab 1.25b 2.75b 7.20a 353.66ab Lannate 0.90 0.00b 0.00b 0.75b 1.50b 5.20a 382.18ab Untreated check 2.75a 1.75b 5.75a 5.75a 13.40a 337.43ab Means in a column with a letter in common are not significantly different (P = 0.05, Ryan's Q Test). ,ETTUCE: Lactuca sativae L. 'Empire' J. C. Palumbo and C. H. Mullis (57E) Beet armyworm (BAW); Spodoptera exigua (Hubner) University of Arizona Cabbage looper (CL); Trichoplusia ni (Hubner) Yuma Valley Agric. Center Yuma, AZ 85364 EVALUATION OF INSECTICIDES FOR CONTROL OF LEPIDOPTEROUS LARVAE IN LETTUCE, 1993: Lettuce was direct seeded into double-row beds on 16 Sep at the Yuma Valley Agricultural Center, Yuma, AZ. The plots were not thinned prior to the experiment. Each plot consisted of four, 30 ft long beds spaced 42 inches apart and bordered on each side by an unplanted bed. Plots were arranged in a completely randomized block design with 4 replicates. Foliar treatments were applied on 7 and 12 Oct with a tractor-mounted boom sprayer (2 TX-8 nozzles/row) operated at 40 psi, delivering 20 gal/acre. Spreader-sticker (Dynamic) was included in all spray treatments at a rate of 0.5% of the total volume. Insecticide efficacy was determined by counting the total number of small (1st and 2nd instars) and large (> 2nd instar) BAW and CL larvae on 25 randomly selected lettuce plants per replicate. Insect counts were conducted on 7, 12, and 17 Oct. Data were analyzed for treatment differences using ANOVA and a protected LSD. BAW and CL populations were low-moderate during the experimental period. There were no significant differences in the number of small BAW and CL larvae among the treatments on any sample date. There were no differences among treatments in the number of large BAW on 7 and 12 Oct. All treatments, except Dipel and Agree, contained significantly fewer large BAW than the untreated check after the second application (17 Oct). All treatments significantly reduced the number of CL during the test. No phytotoxicity was observed. Mean number of small BAW per 25 plants Mean number of large BAW per 25 plants Rate (lbs/acre) 7 Oct 12 Oct 17 Oct 7 Oct 17 Oct Treatment 12 Oct Xentari 1.0 ± 0.4 a 0.0 ± 0.0 a 1.0 0.0 1.0 0.2 ± 0.2 a : 0.6 a 0.8 ± 0.5 a t 0.0 b Dipel 1.0 1.0 ± 0.1 a 1.8 ± 1.1 a 0.5 ± 0.3 a 0.8 : 0.5 a 1.3 ± 0.8 a 0.6 t 0.3 ab Agree 1.0 0.8 ± 0.5 a 0.2 ± 0.2 a 0.2 : 0.2 a 0.0 ± 0.0 a 1.3 t 0.5 a 1.8 ± 0.6 a Stalker 0.1 0.1 ± 0.1 a 0.0 ± 0.0 a 1.3 : 0.9 a 0.0 ± 0.0 a 0.0 t 0.0 b 1.7 ± 0.5 a 0.0 Stalker 0.2 0.2 ± 0.2 a ± 0.0 a 1.0 : 0.5 a 0.0 t 0.0 b 2.0 ± 0.4 a 0.0 t 0.0 a 0.0 RH 5992 0.125 1.8 ± 0.6 a 1.3 ± 0.6 a ± 0.0 a 0.8 : 0.8 a 0.0 t 0.0 a 0.0 t 0.0 b 0.0 ± 0.0 a 0.2 0.0 Larvin 0.75 1.0 ± 0.6 a 0.2 ± 0.2 a : 0.2 a 0.0 ± 0.0 a t 0.0 b 0.2 ± 0.0 a 0.0 1.3 Control 2.7 ± 1.5 a 2.8 ± 0.9 a : 0.0 a 1.3 ± 0.8 a t 0.2 a 0.5 tjOU ( 1 us 2.4 2.0 .7 1.3 0.7 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/101/4639288 by DeepDyve user on 02 August 2020 102 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS Mean number of small CL per 25 plants Mean number of large CL per 25 plants Rate (lbs/acre) 7 Oct 12 Oct 17 Oct 7 Oct 12 Oct 17 Oct Treatment 0.0 ± 0.0 a Xentari 1.0 1.0 0.7 a 0.0 ± 0.0 a 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b Dipel 0.8 ± 0.8 a 0.0 ± 0.0 a 1.0 0.0 0.0 a 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b Agree 0.0 ± 0.0 a 0.0 ± 0.0 a 1.0 0.2 0.2 a 0.0 ± 0.0 a 0.2 ± 0.2 b 0.0 ± 0.0 b Stalker 0.0 ± 0.0 a ± 0.0 a 0.1 0.0 0.0 a 0.0 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b Stalker 0.0 ± 0.0 a ± 0.0 a 0.2 0.2 0.2 a 0.0 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b RH 5992 0.125 0.8 0.8 a 0.0 ± 0.0 a ± 0.0 a 0.0 + 0.0 a 0.0 ± 0.0 b 0.0 + 0.0 b 0.0 0.0 ± 0.0 a Larvin 0.75 0.5 0.5 a ± 0.0 a 0.0 ± 0.0 a 0.0 ± 0.0 b 0.0 ± 0.0 b 0.0 0.2 ± 0.2 a Control 0.0 0.0 a 0.5 ± 0.3 a 0.0 ± 0.0 a 1.3 ± 0.8 a 2.3 ± 0.8 a 0.9 0.6 0 0.8 0.9 1.1 ONIONS: Allium cepa L. 'Golden Cascade' M. Davis, W. Pett, and E. Grafius (58E) Onion maggot; Delia antiqua (Meigen) Department of Entomology Michigan State University East Lansing, MI 48824 ONION MAGGOT CONTROL, 1992: Onions were planted at the Brink Farm near Grant, MI on 11 May. Seeds were planted in single rows with a vee-belt seeder with a 1 inch wide shoe. Plots were 20 ft long and were replicated four times with a randomized complete block arrangement. Treatments consisted of sand pelleted seed except for the conventional seed, which was unpelleted. All pelleted treatments except the pelleted seed control also included Progrow (Vitavax + Thiram) in the pellet. On 9 Jun, 100-plant sections (or total plant stand if less than 100 plants) were marked out in each replicate (block). Total plant stand and numbers of injured plants were recorded on 16, 23, 30 Jun, 7 and 16 Jul and 25 Aug. On 25 Aug all plants were cut open and inspected for onion maggot damage. Percent data were arc sine square root transformed before analysis of variance. Plant stand was never significantly different among treatments on any of the sampling dates, although the two Trigard treatments showed the highest stands during the season and at harvest. Bulb damage observed at harvest was lowest in the Lorsban treatment, followed by the two Trigard treatments. Mean % plant Mean % damage Treatment Rate stand at harvest at harve Trigard pelleted seed 50 g Al/kg seed 62.0 a 5.2 ab Trigard 75 g Al/kg seed 67.9 a 3.8 a pelleted seed Pelleted seed + Lorsban 3.7 oz/1000 row ft 50.0 a 1.0 a Pelleted seed (Progrow only) 37.0 a 9.8 b Pelleted seed control 31.0 a 20.5 c Conventional seed 30.7 a 17.4 c Means within the same column and followed by the same letter are not significantly different (Fisher's protected LSD, P < 0.05). ONIONS: Allium cepa L. 'Golden Cascade' M. Davis, E. Grafius, J. McDaniel, and P. Kolarik (59E) Onion maggot; Delia antiqua (Meigen) Department of Entomology Michigan State University East Lansing, MI 48824 ONION MAGGOT CONTROL, 1993: Onions 'Golden Cascade' were seeded at the Brink Farm near Grant Michigan on 4 May in single rows using a vee-belt seeder with a 1-inch wide shoe. Plots were 15 ft long, replicated five times in a randomized complete block arrangement, 12 inches between rows, with untreated buffer rows between each plot. Plots were seeded at 12 seeds per foot, for a total of 180 seeds per plot. There were four seed treatments with Trigard plus three in-furrow insecticide treatments and associated control treatments. Trigard treatments were: a previously tested pellet formulation containing sand, a new pellet containing diatomaceous earth, and a seed coat held on the seed with a thin film coat. Pelleted seed included the fungicide Progrow. Seed film coat treatment and untreated seed included thiram. Lorsban, Dyfonate, and Admire treatments were applied in furrow at planting with thiram-treated seed. Three weeks post-planting, 100 plant sections in each replicate (or the entire replicate if 100 plants were not present) were marked. The number of damaged plants in each 100 plant section were counted weekly from 8 Jun-8 Jul. Final stand counts were made at the end of the season. Observed onion maggot injury summed for all dates was 29.5 to 44.4% in the controls. Injury was less in Lorsban and Dyfonate treatments than in controls. Observed injury in Trigard treatments was 7.6 to 10.2% and significantly lower than the Lorsban treatment or the controls. All Trigard

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Arthropod Management TestsOxford University Press

Published: Jan 1, 1994

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