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Onion Thrips Control, 1996

Onion Thrips Control, 1996 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/140/4640171 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS 140 Arthropod Management Tests, Vol. 22 ONION: Allium cepa L. 'Vega' Whitney Cranshaw and Jason Bishop (66E) Onion thrips; Thrips tabaci Lindeman Department of Bioagricultural Sciences and Pest Management Colorado State University Ft. Collins, CO 80523 (970)491-6781 ONION THRIPS CONTROL, 1996: Trials conducted in Fruita, CO, using seeded onions (cv. Brown Beauty) in single rows at 30-in spacing Plots were 20-ft in length arranged in a randomized complete block design with 4 replications. Treatments were applied 20 Jun and 11 Jul using a CO compressed air sprayer delivering 19.2 gpa at 40 psi in two passes directed along the sides of the planting. Evaluations were made by examining 10 plants per plot and counting all thrips present in the neck area of the onions. Pest pressure was heavy at the site. Pyrethroid insecticides (Warrior, Mustang, TD-2344-2) provided the most consistent control. Mean no. thrips/plant Treatment and Rate/acre 25 Jun 2 Jul 9 Jul 16 Jul 23 Jul 30 Jul Untreated Check 38.4 b 65.1a 66.7 b 84.5 a 41.4 ab 29.5 a Warrior IE 3.54 fl oz/acre 11.6d 19.6 be 142.4 a ll.Od 8.7 b 28.1a Mustang 1.5EW 0.0375 lb (AI)/acre 10.8 d 12.5 c 113.1 ab 20.6 d 5.5 b 11.9a NAF-85 4SC 50 ppm 58.2 a 31.4 be 62.8 b 64.6 abc 59.8 a 19.3 a NAF-85 4SC 200 ppm 36.0 be 41.7 abc 72.8 b 48.6 abed 48.3 ab 26.8 a TD-2344-02 0.8E 5.6 fl oz/acre 14.8 cd 22.4 be 75.6 b 11.7 d 10.0 b 38.7 a Orthene75 S 1.0 lb (AI)/acre 36.5 be 43.6 abc 72.6 b 40.1 bed 21.4 ab 44.7 a V-71369 0.86E50g(AI)/acr e 37.7 b 50.3 ab 86.7 b 72.5 ab 20.8 ab 28.2 a Vydate 2L 3 pt/acre 32.9 be 22.7 be 70.8 b 25.0 cd 27.9 ab 30.2 a Fipronil 1.67SC 0.05 lb (AI)/acre 25.0 bed 16.0 be 66.2 b 19.2 d 15.1 ab 47.9 a AC 303,630 2SC 0.15 lb (AI)/acre 28.4 bed 25.3 be 56.7 b 13.0 d 22.2 ab 14.2 a AC 303,630 2SC 0.25 lb (AI)/acre 33.8 be 22.3 be 102.9 ab 35.0 bed 44.3 ab 10.6 a Means within a column followed by the same letter are not significantly different (P = 0.05) by SNK. ONION: Allium cepa L. 'Vega' Whitney Cranshaw, D. Casey Sclar, D. Gerace, (67E) Onion thrips; Thrips tabaci Lindeman and A. Tupy Department of Bioagricultural Sciences and Pest Management Colorado State University Ft. Collins, C O 80523 (970)491-6781 EVALUATION OF SOIL TREATMENTS ON CONTROL OF ONION THRIPS ON ONIONS, 1996: A trial was conducted at the Horti culture Field Research Center, Ft. Collins, CO , to evaluate the effects of soil treatments on control of onion thrips. Onions (cv. Vega) were transplanted 14 May by placing them in shallow furrows and covering. Prior to covering, Admire and Fipronil treatments were applied; Vydate applications were made 22 May as a drench that was subsequently irrigated. Individual plots were 15 row-ft, arranged in a randomized complete block with five replications. Plot.'- were evaluated by counting thrips on ten plants/plot. There was a significant reduction in number of onion thrips on Fipronil-treated plots on the first evaluation date (17 Jun), although this disappeared on later dates. These later evaluations showed a trend toward increased thrips numbers on Admire-treated onions. Mean no. thrips/plant Treatment and Rate 17 Jun 24 Jun 27 Jun 23 Jul Admire 2F 1.3 fl oz/1000 row-ft 7.9 a 9.8 ab 13.8 a 33.2 a Fipronil 80WDG 0.1 lb (AI)/acre 2.0 b 6.9 b 7.0 b 23.6 a Vydate 2L 2 qt/acre 5.7 a 14.2 a 10.5 ab 24.8 a Untreated Check 8.6 a 9.2 ab 8.9 ab 23.2 a Numbers within columns followed by the same letter are not significantly different (P = 0.05) by SNK test. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Onion Thrips Control, 1996

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Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.140
Publisher site
See Article on Publisher Site

Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/140/4640171 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS 140 Arthropod Management Tests, Vol. 22 ONION: Allium cepa L. 'Vega' Whitney Cranshaw and Jason Bishop (66E) Onion thrips; Thrips tabaci Lindeman Department of Bioagricultural Sciences and Pest Management Colorado State University Ft. Collins, CO 80523 (970)491-6781 ONION THRIPS CONTROL, 1996: Trials conducted in Fruita, CO, using seeded onions (cv. Brown Beauty) in single rows at 30-in spacing Plots were 20-ft in length arranged in a randomized complete block design with 4 replications. Treatments were applied 20 Jun and 11 Jul using a CO compressed air sprayer delivering 19.2 gpa at 40 psi in two passes directed along the sides of the planting. Evaluations were made by examining 10 plants per plot and counting all thrips present in the neck area of the onions. Pest pressure was heavy at the site. Pyrethroid insecticides (Warrior, Mustang, TD-2344-2) provided the most consistent control. Mean no. thrips/plant Treatment and Rate/acre 25 Jun 2 Jul 9 Jul 16 Jul 23 Jul 30 Jul Untreated Check 38.4 b 65.1a 66.7 b 84.5 a 41.4 ab 29.5 a Warrior IE 3.54 fl oz/acre 11.6d 19.6 be 142.4 a ll.Od 8.7 b 28.1a Mustang 1.5EW 0.0375 lb (AI)/acre 10.8 d 12.5 c 113.1 ab 20.6 d 5.5 b 11.9a NAF-85 4SC 50 ppm 58.2 a 31.4 be 62.8 b 64.6 abc 59.8 a 19.3 a NAF-85 4SC 200 ppm 36.0 be 41.7 abc 72.8 b 48.6 abed 48.3 ab 26.8 a TD-2344-02 0.8E 5.6 fl oz/acre 14.8 cd 22.4 be 75.6 b 11.7 d 10.0 b 38.7 a Orthene75 S 1.0 lb (AI)/acre 36.5 be 43.6 abc 72.6 b 40.1 bed 21.4 ab 44.7 a V-71369 0.86E50g(AI)/acr e 37.7 b 50.3 ab 86.7 b 72.5 ab 20.8 ab 28.2 a Vydate 2L 3 pt/acre 32.9 be 22.7 be 70.8 b 25.0 cd 27.9 ab 30.2 a Fipronil 1.67SC 0.05 lb (AI)/acre 25.0 bed 16.0 be 66.2 b 19.2 d 15.1 ab 47.9 a AC 303,630 2SC 0.15 lb (AI)/acre 28.4 bed 25.3 be 56.7 b 13.0 d 22.2 ab 14.2 a AC 303,630 2SC 0.25 lb (AI)/acre 33.8 be 22.3 be 102.9 ab 35.0 bed 44.3 ab 10.6 a Means within a column followed by the same letter are not significantly different (P = 0.05) by SNK. ONION: Allium cepa L. 'Vega' Whitney Cranshaw, D. Casey Sclar, D. Gerace, (67E) Onion thrips; Thrips tabaci Lindeman and A. Tupy Department of Bioagricultural Sciences and Pest Management Colorado State University Ft. Collins, C O 80523 (970)491-6781 EVALUATION OF SOIL TREATMENTS ON CONTROL OF ONION THRIPS ON ONIONS, 1996: A trial was conducted at the Horti culture Field Research Center, Ft. Collins, CO , to evaluate the effects of soil treatments on control of onion thrips. Onions (cv. Vega) were transplanted 14 May by placing them in shallow furrows and covering. Prior to covering, Admire and Fipronil treatments were applied; Vydate applications were made 22 May as a drench that was subsequently irrigated. Individual plots were 15 row-ft, arranged in a randomized complete block with five replications. Plot.'- were evaluated by counting thrips on ten plants/plot. There was a significant reduction in number of onion thrips on Fipronil-treated plots on the first evaluation date (17 Jun), although this disappeared on later dates. These later evaluations showed a trend toward increased thrips numbers on Admire-treated onions. Mean no. thrips/plant Treatment and Rate 17 Jun 24 Jun 27 Jun 23 Jul Admire 2F 1.3 fl oz/1000 row-ft 7.9 a 9.8 ab 13.8 a 33.2 a Fipronil 80WDG 0.1 lb (AI)/acre 2.0 b 6.9 b 7.0 b 23.6 a Vydate 2L 2 qt/acre 5.7 a 14.2 a 10.5 ab 24.8 a Untreated Check 8.6 a 9.2 ab 8.9 ab 23.2 a Numbers within columns followed by the same letter are not significantly different (P = 0.05) by SNK test.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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