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Efficacy of Fipronil for Thrips Control on Onions, 1996

Efficacy of Fipronil for Thrips Control on Onions, 1996 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/144/4640194 by DeepDyve user on 21 July 2020 144 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS ONION: Allium cepa L. 'Vega' D. Gerace, D. Casey Sclar, W. Cranshaw (7IE) Onion thrips: Thrips tabaci Lindeman and A. Tupy Department of Bioagricultural Sciences and Pest Management Colorado State University Ft. Collins, CO 80523 (970)491-6781 CONTRO L OF ONION THRIPS USING BEAUVERIA BASSIANA FORMULATIONS, 1996: Trials were conducted at the Horticulture Field Research Center of Colorado State University in Ft. Collins, CO , to evaluate two Beauveria bassiana formulations for the control of onion thrips on onions. Individual plots consisted of two rows of transplanted onions (cv. 'Vega') arranged in single-row beds, at 30-inch spacing, 5-ft in length with a 2-ft buffer between plots. Plots were arranged in a RC B design with four replications. During each application an equivalent of 1273 1/ha, including the wetting agent Silwet, was applied using a hand operated pump mister, that allowed thorough wetting of the foliage. Applications were made 21 Jun, 5 Jul, and 17 Jul. Evaluations were made by counting all thrips on 6 plants/plot. No significant control of onion thrips was observed by any of the treatments in this trial. Mean no. thrips/6 plants Treatment and rate/liter applied solution" 24 Jun 12 Jul 23 Jul 177.8 a 154.3 a 171.8 a Naturalis-O 7.8 ml/liter 128.5 a 121.0 a 165.5 a Mycotech ES9505 4.6 ml/liter 127.0 a 122.0 a 233.0 a Mycotech WP9503 2.2 gr/liter 130.8 a 136.0 a 160.3 a Water Check Means in a column followed by the same letter within a column are not significantly different (P — 0.05) by SNK. "All treatments, except the water check, included the addition of 0.4 ml Silwet/1 as a wetting agent. Rates were applied in the equivalent of 1273 1/ha. D. L. Kerns and T. Tellez ONION: Allium cepa L. (72E) Onion thrips (OT); Thrips tabaci Lindeman University of Arizona Western flower thrips (WFT); Franklinella occidentalis (Pergande) Department of Entomology Yuma Valley Agric. Center Yuma, Arizona 85364 (520) 782-3836 EFFICACY OF FIPRONIL FOR THRIPS CONTROL ON ONIONS, 1996: Onions were planted on 42 inch beds in double rows near Somer- ton, AZ. The test was a RCB design consisting of four replicates. Each plot was 2 beds wide by 25 ft, bordered on each side by 2 buffer beds. Applications were made using a backpack CO with two TX-10 hollow cone nozzles per bed. The sprayer was calibrated to deliver 20 gpa at 45 psi. Treatments were applied on 19 Apr 2 and 26 Apr. All treatments included Kinetic non-ionic surfactant at 0.1 % v/v. Evaluations were made by cutting and bagging 16 green onion tops per plot. These samples were taken to the laboratory where they were rinsed with a soap/water solution and filtered through filter paper. The thrips were then counted on the filter paper under dissecting microscopes. Evaluations were made 3 and 7 days after each application (22 Apr, 26 Apr, 29 Apr and 3 Mar). Differences among treatments were separated using ANOVA and an F protected LSD. Precounts were taken on 17 Apr. There were no significant differences in OT or WFT among treatments. OT populations were high in this trial while WFT were low. Fipronil, particularly at the higher rates, appeared to be as effective as the local commercial standard, Ammo + Lannate, against both OT and WFT. Mean no. onion thrips/plant 26 Apr 29 Apr 3 Mar Seasonal mean" Rate 22 Apr Seasonal mean" Treatment lbs(AI)/acre 3 DAT 7 DAT 3 DAT 7 DAT 3 DAT 7 DAT Fipronil 0.025 35.77 b 19.00 a 12.28 b 15.62 b 24.03 b 17.31 b Fipronil 0.05 24.71 be 13.58 a 6.86 b 10.69 b 15.80 be 12.13 b Fipronil 0.068 16.88 c 13.46 a 7.83 b 11.53 b 12.35 c 12.50 b Ammo 2.5EC 0.3 15.42 c 14.96 a 9.07 b 14.03 b 12.25 c 14.50 b + Lannate Untreated Check 51.25 a 46.00 a 33.85 a 63.89 a 42.55 a 54.95 a Means in a column followed by the same letter are not significantly different (F protected LSD P < 0.05). All treatments were applied with Kinetic non- ionic surfactant at 0.1 % v/v. "Seasonal average across evaluations. Downloaded from https://academic.oup.com/amt/article-abstract/22/1/144/4640194 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 145 Mean no. western flower thrips/plant Rate 22 Apr 26 Apr 29 Apr 3 Mar Seasonal mean" Seasonal me Treatment lbs(AI)/acre 3 DAT 7 DAT 3 DAT 7 DAT 3 DAT 7 DAT Fipronil 0.025 1.42 a 1.39 a 1.13b 0.72 b 1.28 a 1.06 a Fipronil 0.05 1.57 a 1.28 a 0.64 b 0.53 b 1.11 a 0.91 b Fipronil 0.068 1.80 a 0.88 a 0.61 b 0.82 b 1.21 a 0.85 b Ammo 2.5EC 0.3 0.97 a 1.50 a 0.89 b 0.55 b 0.93 a 1.03 b + Lannate Untreated 1.11 a 2.83 a 2.66 a 1.44 a 1.89 a 2.14 a Means in a column followed by the same letter are not significantly different (F protected LSD P < 0.05). All treatments were applied with Kinetic non- ionic surfactant at 0.1 % v/v. Seasonal average across evaluations. ONION: Allium cepa L. 'Grano 1015Y' R. F. L. Mau and (73E) Onion thrips (OT); Thrips tabaci Lindeman L. R. Gusukuma-Minuto University of Hawaii Dept. of Entomology 3050 Maile Way, Rm 310 Honolulu, HI 96822 (808) 956-7063 R. S. Shimabuku Cooperative Extension Service 310 Kaahumanu Ave. Bldg 214 Kahului, HI 96732 EVALUATION OF INSECTICIDES FOR ONION THRIPS CONTRO L ON DR Y ONION, 1996: The insecticides were evaluated at the Kula Research Station, Maui Agricultural Park, from June to September. The field was set up in a RCB design with six treatments and four replications (blocks). Each treatment plot consisted of four rows of plants planted at 8 in. between-plant spacing. Each row consisted of 45 plants. Seedlings were transplanted into the field on 17 Jun . Treatments were applied using a compressed carbon dioxide sprayer at 60 psi and 100 gpa. Tw o twin je t nozzles (TJ-6502) were used per two rows. Applications of Warrior at 0.02 and 0.03 lb. (AI)/acre, Lannate, and Ammo were made at 7-day intervals on 16, 23 , 30 July, 6, 13, 20 Aug for a total of six applications. An additional treatment of Warrior @ 0.03 lb. (AI)/acre was made when thrips numbers exceeded 3 thrips/plant on 23 Jul, 6 and 20 Aug. A pre-treatment survey was made on 15 Jul. Subsequent surveys were made on a bi-weekly schedule. In surveying for thrips, ten plants were ran­ domly selected and removed. The bulb and leaves were removed and the whorl of the onion was placed in separate plastic zip lock bags. Each sample was washed in a detergent solution and the thrips were collected in a 150 mesh sieve. The thrips were transferred into 20 ml plastic vials, preserved with 70% ethyl alcohol, and counted at a later date. Thrips were recorded by development stages first instar (LI), second instar (LII), and adults (A). Weekly Warrior and Ammo treatments were very effective in causing 10- to 20-fold reduction in thrips numbers. There was no difference in the thrips control by either rate of Warrior, both being equally effective. A single application of Warrior using a treatment threshold of 3 thrips/plant was os­ tensibly as effective as the two weekly applications of Warrior. Ammo was also highly effective and Lannate less so in reducing thrips numbers relative to untreated check. Warrior and Ammo treatments successfully regulated thrips numbers at low levels. Mean no thrips/10 plants Pre-treatment (July 15) Treatment Rate/acre LI LII A Total Warrior II 1EC 0.03 lb (AI) 8.85b 6.63a 31.35a 15.88a Warrior II 1EC 0.02 lb (AI) 8.08b 17.15a 6.90a 32.13a Warrior II 1EC 0.03 lb (AI) (3 thrips/plant threshold) 10.85ab 16.58a 4.98a 32.40a Lannate LV 0.45 lb (AI) 8.85b 19.25a 7.65a 35.75a Ammo 2.5EC 0.08 lb (AI) 11.28ab 13.25a 6.60a 31.13a Untreated Check 14.80a 12.20a 4.75a 31.75a Means in the same column followed by a different letter are significantly different (P < 0.001, SAS for Windows version 6.11). Data were transformed by square root (Y + 0.5) prior to analysis. Untransformed means are presented. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Efficacy of Fipronil for Thrips Control on Onions, 1996

Arthropod Management Tests , Volume 22 (1) – Jan 1, 1997

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Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.144a
Publisher site
See Article on Publisher Site

Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/144/4640194 by DeepDyve user on 21 July 2020 144 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS ONION: Allium cepa L. 'Vega' D. Gerace, D. Casey Sclar, W. Cranshaw (7IE) Onion thrips: Thrips tabaci Lindeman and A. Tupy Department of Bioagricultural Sciences and Pest Management Colorado State University Ft. Collins, CO 80523 (970)491-6781 CONTRO L OF ONION THRIPS USING BEAUVERIA BASSIANA FORMULATIONS, 1996: Trials were conducted at the Horticulture Field Research Center of Colorado State University in Ft. Collins, CO , to evaluate two Beauveria bassiana formulations for the control of onion thrips on onions. Individual plots consisted of two rows of transplanted onions (cv. 'Vega') arranged in single-row beds, at 30-inch spacing, 5-ft in length with a 2-ft buffer between plots. Plots were arranged in a RC B design with four replications. During each application an equivalent of 1273 1/ha, including the wetting agent Silwet, was applied using a hand operated pump mister, that allowed thorough wetting of the foliage. Applications were made 21 Jun, 5 Jul, and 17 Jul. Evaluations were made by counting all thrips on 6 plants/plot. No significant control of onion thrips was observed by any of the treatments in this trial. Mean no. thrips/6 plants Treatment and rate/liter applied solution" 24 Jun 12 Jul 23 Jul 177.8 a 154.3 a 171.8 a Naturalis-O 7.8 ml/liter 128.5 a 121.0 a 165.5 a Mycotech ES9505 4.6 ml/liter 127.0 a 122.0 a 233.0 a Mycotech WP9503 2.2 gr/liter 130.8 a 136.0 a 160.3 a Water Check Means in a column followed by the same letter within a column are not significantly different (P — 0.05) by SNK. "All treatments, except the water check, included the addition of 0.4 ml Silwet/1 as a wetting agent. Rates were applied in the equivalent of 1273 1/ha. D. L. Kerns and T. Tellez ONION: Allium cepa L. (72E) Onion thrips (OT); Thrips tabaci Lindeman University of Arizona Western flower thrips (WFT); Franklinella occidentalis (Pergande) Department of Entomology Yuma Valley Agric. Center Yuma, Arizona 85364 (520) 782-3836 EFFICACY OF FIPRONIL FOR THRIPS CONTROL ON ONIONS, 1996: Onions were planted on 42 inch beds in double rows near Somer- ton, AZ. The test was a RCB design consisting of four replicates. Each plot was 2 beds wide by 25 ft, bordered on each side by 2 buffer beds. Applications were made using a backpack CO with two TX-10 hollow cone nozzles per bed. The sprayer was calibrated to deliver 20 gpa at 45 psi. Treatments were applied on 19 Apr 2 and 26 Apr. All treatments included Kinetic non-ionic surfactant at 0.1 % v/v. Evaluations were made by cutting and bagging 16 green onion tops per plot. These samples were taken to the laboratory where they were rinsed with a soap/water solution and filtered through filter paper. The thrips were then counted on the filter paper under dissecting microscopes. Evaluations were made 3 and 7 days after each application (22 Apr, 26 Apr, 29 Apr and 3 Mar). Differences among treatments were separated using ANOVA and an F protected LSD. Precounts were taken on 17 Apr. There were no significant differences in OT or WFT among treatments. OT populations were high in this trial while WFT were low. Fipronil, particularly at the higher rates, appeared to be as effective as the local commercial standard, Ammo + Lannate, against both OT and WFT. Mean no. onion thrips/plant 26 Apr 29 Apr 3 Mar Seasonal mean" Rate 22 Apr Seasonal mean" Treatment lbs(AI)/acre 3 DAT 7 DAT 3 DAT 7 DAT 3 DAT 7 DAT Fipronil 0.025 35.77 b 19.00 a 12.28 b 15.62 b 24.03 b 17.31 b Fipronil 0.05 24.71 be 13.58 a 6.86 b 10.69 b 15.80 be 12.13 b Fipronil 0.068 16.88 c 13.46 a 7.83 b 11.53 b 12.35 c 12.50 b Ammo 2.5EC 0.3 15.42 c 14.96 a 9.07 b 14.03 b 12.25 c 14.50 b + Lannate Untreated Check 51.25 a 46.00 a 33.85 a 63.89 a 42.55 a 54.95 a Means in a column followed by the same letter are not significantly different (F protected LSD P < 0.05). All treatments were applied with Kinetic non- ionic surfactant at 0.1 % v/v. "Seasonal average across evaluations. Downloaded from https://academic.oup.com/amt/article-abstract/22/1/144/4640194 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 145 Mean no. western flower thrips/plant Rate 22 Apr 26 Apr 29 Apr 3 Mar Seasonal mean" Seasonal me Treatment lbs(AI)/acre 3 DAT 7 DAT 3 DAT 7 DAT 3 DAT 7 DAT Fipronil 0.025 1.42 a 1.39 a 1.13b 0.72 b 1.28 a 1.06 a Fipronil 0.05 1.57 a 1.28 a 0.64 b 0.53 b 1.11 a 0.91 b Fipronil 0.068 1.80 a 0.88 a 0.61 b 0.82 b 1.21 a 0.85 b Ammo 2.5EC 0.3 0.97 a 1.50 a 0.89 b 0.55 b 0.93 a 1.03 b + Lannate Untreated 1.11 a 2.83 a 2.66 a 1.44 a 1.89 a 2.14 a Means in a column followed by the same letter are not significantly different (F protected LSD P < 0.05). All treatments were applied with Kinetic non- ionic surfactant at 0.1 % v/v. Seasonal average across evaluations. ONION: Allium cepa L. 'Grano 1015Y' R. F. L. Mau and (73E) Onion thrips (OT); Thrips tabaci Lindeman L. R. Gusukuma-Minuto University of Hawaii Dept. of Entomology 3050 Maile Way, Rm 310 Honolulu, HI 96822 (808) 956-7063 R. S. Shimabuku Cooperative Extension Service 310 Kaahumanu Ave. Bldg 214 Kahului, HI 96732 EVALUATION OF INSECTICIDES FOR ONION THRIPS CONTRO L ON DR Y ONION, 1996: The insecticides were evaluated at the Kula Research Station, Maui Agricultural Park, from June to September. The field was set up in a RCB design with six treatments and four replications (blocks). Each treatment plot consisted of four rows of plants planted at 8 in. between-plant spacing. Each row consisted of 45 plants. Seedlings were transplanted into the field on 17 Jun . Treatments were applied using a compressed carbon dioxide sprayer at 60 psi and 100 gpa. Tw o twin je t nozzles (TJ-6502) were used per two rows. Applications of Warrior at 0.02 and 0.03 lb. (AI)/acre, Lannate, and Ammo were made at 7-day intervals on 16, 23 , 30 July, 6, 13, 20 Aug for a total of six applications. An additional treatment of Warrior @ 0.03 lb. (AI)/acre was made when thrips numbers exceeded 3 thrips/plant on 23 Jul, 6 and 20 Aug. A pre-treatment survey was made on 15 Jul. Subsequent surveys were made on a bi-weekly schedule. In surveying for thrips, ten plants were ran­ domly selected and removed. The bulb and leaves were removed and the whorl of the onion was placed in separate plastic zip lock bags. Each sample was washed in a detergent solution and the thrips were collected in a 150 mesh sieve. The thrips were transferred into 20 ml plastic vials, preserved with 70% ethyl alcohol, and counted at a later date. Thrips were recorded by development stages first instar (LI), second instar (LII), and adults (A). Weekly Warrior and Ammo treatments were very effective in causing 10- to 20-fold reduction in thrips numbers. There was no difference in the thrips control by either rate of Warrior, both being equally effective. A single application of Warrior using a treatment threshold of 3 thrips/plant was os­ tensibly as effective as the two weekly applications of Warrior. Ammo was also highly effective and Lannate less so in reducing thrips numbers relative to untreated check. Warrior and Ammo treatments successfully regulated thrips numbers at low levels. Mean no thrips/10 plants Pre-treatment (July 15) Treatment Rate/acre LI LII A Total Warrior II 1EC 0.03 lb (AI) 8.85b 6.63a 31.35a 15.88a Warrior II 1EC 0.02 lb (AI) 8.08b 17.15a 6.90a 32.13a Warrior II 1EC 0.03 lb (AI) (3 thrips/plant threshold) 10.85ab 16.58a 4.98a 32.40a Lannate LV 0.45 lb (AI) 8.85b 19.25a 7.65a 35.75a Ammo 2.5EC 0.08 lb (AI) 11.28ab 13.25a 6.60a 31.13a Untreated Check 14.80a 12.20a 4.75a 31.75a Means in the same column followed by a different letter are significantly different (P < 0.001, SAS for Windows version 6.11). Data were transformed by square root (Y + 0.5) prior to analysis. Untransformed means are presented.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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