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Control of Insect Pests on Cabbage with Spinosad, 1996

Control of Insect Pests on Cabbage with Spinosad, 1996 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/105/4640000 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 105 RH-2485 was not effective in controlling DBM despite its low population density. A few larvae on the RH-2485 treated plants penetrated the cab­ bage heads and caused damage below the wrapper leaves rendering the harvested heads un-marketable. RH-2485 was effective in controlling ICW, which was the dominant lepidopteran species observed throughout most of the experiment. ICWW and CL larvae occurred at trace levels. However, it appeared the RH-2485 was effective in controlling these pests. Seasonal mean no./10 plants DMB CL ICW Treatment Rate/acre Larvae Pupae Larvae Pupae Larvae Pupae RH-2485 80 WP 0.20 lb (AI) 0.84a 0.16ab 0.00b 0 0.39b 0.00b RH-2485 80 WP 0.30 lb (AI) 0.86a 0.24a 0.00b 0 0.21b 0.00b RH-2485 80 WP 0.40 lb (AI) 1.14a 0.1 la b 0.00b 0 0.16b 0.00b Treated Check 0.18b 0.01b 0.05a 0 0.42b 0.00b 0.98a 0.18a 0.07a 0 2.49a 0.08a Untreated Check Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001 SAS for Windows, version 6.11). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. Seasonal mean no./lO plants ICW W Rate/acre Larvae % Marketable heads Pupa rn RH-2485 80 W P 0.20 lb (AI) 0.00b 0 55.0b RH-2485 80 WP 0.30 lb (AI) 0.00b 0 57.5b RH-2485 80 WP 0.40 lb (AI) 0.00b 0 60.0b Treated Check 0.00b 0 95.0a Untreated Check 0.26 0 0.0c Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001 SAS for Windows, version i. 11). Data were transformed by square root (X + 0.5) prior to analysis. Percent marketable datum was transformed by arcsin prior to analysis. Untransformed means are presented. CABBAGE: Brassica oleracea capitata L. E. McEnhill, E. Grafius (25E) Imported cabbageworm: Artogeia rapae (L.) Department of Entomology Michigan State University Cabbage looper: Trichoplusia ni (Hiibner) East Lansing, MI 48824 Diamondback moth: Plutella xylostella (L.) (517)353-869 5 CONTROL OF INSECT PESTS ON CABBAGE WITH SPINOSAD, 1996: Two rates of Spinosad were tested in Michigan State University Entomology Research Farm, in East Lansing, MI, for the control of imported cabbageworm, cabbage looper, and diamondback moth and their effect on beneficial insects. Seedlings were transplanted on 18 July at 2-ft spacing into four row plots 40 feet long. There was a 10-ft untreated zone between each plot within each row and an untreated row (3-ft spacing) on either side of the plots. Treatments were replicated three times and assigned to plots in a RCB design. Insecticides were applied using a C0 backpack sprayer with a single boom (40 psi, 20 gal/A), on 12 and 23 Aug. and 4 Sep. All insects on 10 ran­ domly selected plants were sampled in each plot on 7, and 16 Aug, and 2 and 10 Sep. The percent defoliation of outer leaves was assessed on 17 Sep, when 8-10 heads per plot were harvested. These were then rated for marketability: no damage, slight damage (damage to outer leaves of head only), or unmar­ ketable (damage to head beyond outer couple of leaves). Spinosad showed some control of lepidopterous pests on cabbage but the standard Pounce treatment was superior in most cases. The most notice­ able difference was in the head marketability ratings. The low rate of Spinosad was not significantly different from the untreated plots. Seasonal mean number of pests/plant Imported cabbageworm Diamondback moth Small larvae Large larvae Pupa Treatment Rate/acre 7 Aug 19 Aug 2 Sep 10 Sep 7 Aug 19 Aug 2 Sep 10 Sep 7 Aug 19 Aug 2 Sep 10 Sep Spinosad 0.044 lb (AI) 0.40 0.00 1.20b 0.27 0.00 0.00 1.06b 0.13 0.00 0.00b 0.00c 0.07 Spinosad 0.089 lb (AI) 0.60 0.00 0.79c 0.20 0.00 0.00 0.61c 0.17 0.13 0.00b 0.03b 0.17 Pounce 4.0 oz 0.30 0.00 O.OOd 0.60 0.04 0.00 0.03d 0.00 0.07 0.00b 0.00c 0.63 Untreated Check 0.30 0.07 1.50a 0.23 0.03 0.00 1.87a 0.23 0.10 0.07a 0.37a 0.50 Means within a column followed by the different letters are significantly different (P < 0.05, Tukey' s HSD, a 0.05) Data transformed for analysis with log(x + 1) 'All treatments except for the Confirm/Latron treatment also contained Silwet L-77 at a rate of 0.14% v/v. Downloaded from https://academic.oup.com/amt/article-abstract/22/1/105/4640000 by DeepDyve user on 21 July 2020 106 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS % Head marketability No Damage Slight damage Unmarketable % Defolliation Treatment" Rate/acre Spinosad 0.044 lb (AI) 0.0±0.0 c 47.9±35.4 a 52.1±35.4 a 8.8±0.7 b Spinosad 0.089 lb (AI) 8.3±2.7 b 18.8±6.2b 56.2 ± 18.8a 25.0 ± 12.5b Pounce 4.0 oz 1.7±0.3c 96.7±3.3 a 0.0±0.0 c 3.3±3.3 c Untreated Check 16.7+1.l a 0.0±0.0 c 24.3±6.8 b 75.7±6.8 a Means within a column followed by the different letters are significantly different (P < 0.05, Tukey' s HSD, a •• 0.05 ) 1/2 All data transformed for analysis with arcsin (x ) "All treatments contained Silwet L-77 at a rate of 0.14% v/v. CABBAGE: Brassica oleracea capitata L. E. McEnhill, E. Grafius (26E) Imported cabbageworm: Artogeia rapae (L.) Department of Entomology Cabbage looper: Trichoplusia ni (Hiibner) Michigan State University Diamondback moth: Plutella xylostella (L.) East Lansing, MI 48824 (517)353-869 5 INSECT PEST CONTROL IN CABBAGE, 1996: Six insecticide treatments were tested at Michigan State University Entomology Research Farm, in East Lansing, MI, for their control of imported cabbageworm, cabbage looper, and diamondback moth. Seedlings were transplanted at 2-ft spac­ ing in single-row plots, 15 ft long, on 18 Jul. There was a 6-ft untreated zone between two plots with an untreated row (3 ft spacing) on either side of a treated row. Treatments were replicated four times in a RCB design. Insecticides were applied using a C0 backpack sprayer with a single boom and a hand-held nozzle (30 psi, 20 gal/A). Treatments were sprayed on 12 and 23 Aug, and 4 Sep. All insects on two randomly selected plants were counted in each plot on 7, 16 and 29 Aug and 10 Sep. The percent defoliation of outer leaves was assessed for each plot on 17 Sep, before the heads were harvested. These were then assigned a marketability rating: no damage, slight damage (outer leaves of the head only), or unmarketable (damage to head beyond the outer couple of leaves). There was a very light infestation of cabbage loopers this year and the cabbage aphids were very patchy in the field. Imported cabbageworm was the only pest that showed any weekly or seasonal significant differences, and it was not observed until late in the season. There were no significant differ­ ences in the marketability of the treated plots and the untreated plots were the only ones with any unmarketable heads. Mean no. imported cabbageworms/plant 7 Aug 19 Aug 29 Aug 10 Sep Small Large Small Small Large Small Large Large Treatment" Rate larvae larvae Pupa larvae larvae Pupa larvae larvae Pupa larvae larvae Pupa 0.25 0.00 0.38 0.00 1.25a 0.88 0.38 Untreated Check 0.00 0.00 5.25a 0.63a 0.00b 4.0 oz/acre 0.13 0.13 0.00 0.00 0.00 0.00 0.13bc 0.00 0.13 0.13ab Pounce 0.00b 0.00b 0.13bc 0.00 Able WP & 1000 g/Ha 0.75 0.13 0.00 0.25 0.00 0.50 0.13b 0.13 0.00b 0.63a Agree WP 1000 g/Ha Proclaim 0.16EC 0.0075 lb (AI)/acre 0.25 0.13 0.00 0.00 0.00 0.13 0.38abc 0.13b 0.13 0.00 0.00b 0.75a Proclaim 5SG 0.0075 lb (AI)/acre 0.63 0.25 0.00 0.00 0.00 0.38 0.25abc 0.50b 0.13 0.13 0.00b 0.75ab Mustang 0.0375 lb (AI)/acre 1.25 0.00 0.00 0.00 0.00 0.13 0.00c 0.13b 0.00 0.00 0.13ab 0.25ab 0.50 0.00 0.00 0.00 0.75abc 0.13 0.00 TD2344-02 0.8EC 0.035 lb. (AI)/acre 0.00 0.00 0.38b 0.00b 0.13ab Confirm + 8.0 oz/acre 0.38 0.00 0.00 0.50 0.00 0.00 0.88ab 0.38b 0.13 0.00 0.00b 0.13ab Latron CS-7 0.06% v/v Means within a column followed by different letters are significantly different (P < 0.05, Tukey' s HSD, a = 0.05); Data transformed for analysis with log(x + 1) "All treatments except Confirm/Latron also contained Silwet L-77 at a rate of 0.14% v/v. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Control of Insect Pests on Cabbage with Spinosad, 1996

McEnhill,, E.; Grafius,, E.
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/22.1.105
Publisher site
See Article on Publisher Site

Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/105/4640000 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 105 RH-2485 was not effective in controlling DBM despite its low population density. A few larvae on the RH-2485 treated plants penetrated the cab­ bage heads and caused damage below the wrapper leaves rendering the harvested heads un-marketable. RH-2485 was effective in controlling ICW, which was the dominant lepidopteran species observed throughout most of the experiment. ICWW and CL larvae occurred at trace levels. However, it appeared the RH-2485 was effective in controlling these pests. Seasonal mean no./10 plants DMB CL ICW Treatment Rate/acre Larvae Pupae Larvae Pupae Larvae Pupae RH-2485 80 WP 0.20 lb (AI) 0.84a 0.16ab 0.00b 0 0.39b 0.00b RH-2485 80 WP 0.30 lb (AI) 0.86a 0.24a 0.00b 0 0.21b 0.00b RH-2485 80 WP 0.40 lb (AI) 1.14a 0.1 la b 0.00b 0 0.16b 0.00b Treated Check 0.18b 0.01b 0.05a 0 0.42b 0.00b 0.98a 0.18a 0.07a 0 2.49a 0.08a Untreated Check Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001 SAS for Windows, version 6.11). Data were transformed by square root (X + 0.5) prior to analysis. Untransformed means are presented. Seasonal mean no./lO plants ICW W Rate/acre Larvae % Marketable heads Pupa rn RH-2485 80 W P 0.20 lb (AI) 0.00b 0 55.0b RH-2485 80 WP 0.30 lb (AI) 0.00b 0 57.5b RH-2485 80 WP 0.40 lb (AI) 0.00b 0 60.0b Treated Check 0.00b 0 95.0a Untreated Check 0.26 0 0.0c Means in each column followed by a different letter are significantly different (Tukey's studentized range test P < 0.001 SAS for Windows, version i. 11). Data were transformed by square root (X + 0.5) prior to analysis. Percent marketable datum was transformed by arcsin prior to analysis. Untransformed means are presented. CABBAGE: Brassica oleracea capitata L. E. McEnhill, E. Grafius (25E) Imported cabbageworm: Artogeia rapae (L.) Department of Entomology Michigan State University Cabbage looper: Trichoplusia ni (Hiibner) East Lansing, MI 48824 Diamondback moth: Plutella xylostella (L.) (517)353-869 5 CONTROL OF INSECT PESTS ON CABBAGE WITH SPINOSAD, 1996: Two rates of Spinosad were tested in Michigan State University Entomology Research Farm, in East Lansing, MI, for the control of imported cabbageworm, cabbage looper, and diamondback moth and their effect on beneficial insects. Seedlings were transplanted on 18 July at 2-ft spacing into four row plots 40 feet long. There was a 10-ft untreated zone between each plot within each row and an untreated row (3-ft spacing) on either side of the plots. Treatments were replicated three times and assigned to plots in a RCB design. Insecticides were applied using a C0 backpack sprayer with a single boom (40 psi, 20 gal/A), on 12 and 23 Aug. and 4 Sep. All insects on 10 ran­ domly selected plants were sampled in each plot on 7, and 16 Aug, and 2 and 10 Sep. The percent defoliation of outer leaves was assessed on 17 Sep, when 8-10 heads per plot were harvested. These were then rated for marketability: no damage, slight damage (damage to outer leaves of head only), or unmar­ ketable (damage to head beyond outer couple of leaves). Spinosad showed some control of lepidopterous pests on cabbage but the standard Pounce treatment was superior in most cases. The most notice­ able difference was in the head marketability ratings. The low rate of Spinosad was not significantly different from the untreated plots. Seasonal mean number of pests/plant Imported cabbageworm Diamondback moth Small larvae Large larvae Pupa Treatment Rate/acre 7 Aug 19 Aug 2 Sep 10 Sep 7 Aug 19 Aug 2 Sep 10 Sep 7 Aug 19 Aug 2 Sep 10 Sep Spinosad 0.044 lb (AI) 0.40 0.00 1.20b 0.27 0.00 0.00 1.06b 0.13 0.00 0.00b 0.00c 0.07 Spinosad 0.089 lb (AI) 0.60 0.00 0.79c 0.20 0.00 0.00 0.61c 0.17 0.13 0.00b 0.03b 0.17 Pounce 4.0 oz 0.30 0.00 O.OOd 0.60 0.04 0.00 0.03d 0.00 0.07 0.00b 0.00c 0.63 Untreated Check 0.30 0.07 1.50a 0.23 0.03 0.00 1.87a 0.23 0.10 0.07a 0.37a 0.50 Means within a column followed by the different letters are significantly different (P < 0.05, Tukey' s HSD, a 0.05) Data transformed for analysis with log(x + 1) 'All treatments except for the Confirm/Latron treatment also contained Silwet L-77 at a rate of 0.14% v/v. Downloaded from https://academic.oup.com/amt/article-abstract/22/1/105/4640000 by DeepDyve user on 21 July 2020 106 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS % Head marketability No Damage Slight damage Unmarketable % Defolliation Treatment" Rate/acre Spinosad 0.044 lb (AI) 0.0±0.0 c 47.9±35.4 a 52.1±35.4 a 8.8±0.7 b Spinosad 0.089 lb (AI) 8.3±2.7 b 18.8±6.2b 56.2 ± 18.8a 25.0 ± 12.5b Pounce 4.0 oz 1.7±0.3c 96.7±3.3 a 0.0±0.0 c 3.3±3.3 c Untreated Check 16.7+1.l a 0.0±0.0 c 24.3±6.8 b 75.7±6.8 a Means within a column followed by the different letters are significantly different (P < 0.05, Tukey' s HSD, a •• 0.05 ) 1/2 All data transformed for analysis with arcsin (x ) "All treatments contained Silwet L-77 at a rate of 0.14% v/v. CABBAGE: Brassica oleracea capitata L. E. McEnhill, E. Grafius (26E) Imported cabbageworm: Artogeia rapae (L.) Department of Entomology Cabbage looper: Trichoplusia ni (Hiibner) Michigan State University Diamondback moth: Plutella xylostella (L.) East Lansing, MI 48824 (517)353-869 5 INSECT PEST CONTROL IN CABBAGE, 1996: Six insecticide treatments were tested at Michigan State University Entomology Research Farm, in East Lansing, MI, for their control of imported cabbageworm, cabbage looper, and diamondback moth. Seedlings were transplanted at 2-ft spac­ ing in single-row plots, 15 ft long, on 18 Jul. There was a 6-ft untreated zone between two plots with an untreated row (3 ft spacing) on either side of a treated row. Treatments were replicated four times in a RCB design. Insecticides were applied using a C0 backpack sprayer with a single boom and a hand-held nozzle (30 psi, 20 gal/A). Treatments were sprayed on 12 and 23 Aug, and 4 Sep. All insects on two randomly selected plants were counted in each plot on 7, 16 and 29 Aug and 10 Sep. The percent defoliation of outer leaves was assessed for each plot on 17 Sep, before the heads were harvested. These were then assigned a marketability rating: no damage, slight damage (outer leaves of the head only), or unmarketable (damage to head beyond the outer couple of leaves). There was a very light infestation of cabbage loopers this year and the cabbage aphids were very patchy in the field. Imported cabbageworm was the only pest that showed any weekly or seasonal significant differences, and it was not observed until late in the season. There were no significant differ­ ences in the marketability of the treated plots and the untreated plots were the only ones with any unmarketable heads. Mean no. imported cabbageworms/plant 7 Aug 19 Aug 29 Aug 10 Sep Small Large Small Small Large Small Large Large Treatment" Rate larvae larvae Pupa larvae larvae Pupa larvae larvae Pupa larvae larvae Pupa 0.25 0.00 0.38 0.00 1.25a 0.88 0.38 Untreated Check 0.00 0.00 5.25a 0.63a 0.00b 4.0 oz/acre 0.13 0.13 0.00 0.00 0.00 0.00 0.13bc 0.00 0.13 0.13ab Pounce 0.00b 0.00b 0.13bc 0.00 Able WP & 1000 g/Ha 0.75 0.13 0.00 0.25 0.00 0.50 0.13b 0.13 0.00b 0.63a Agree WP 1000 g/Ha Proclaim 0.16EC 0.0075 lb (AI)/acre 0.25 0.13 0.00 0.00 0.00 0.13 0.38abc 0.13b 0.13 0.00 0.00b 0.75a Proclaim 5SG 0.0075 lb (AI)/acre 0.63 0.25 0.00 0.00 0.00 0.38 0.25abc 0.50b 0.13 0.13 0.00b 0.75ab Mustang 0.0375 lb (AI)/acre 1.25 0.00 0.00 0.00 0.00 0.13 0.00c 0.13b 0.00 0.00 0.13ab 0.25ab 0.50 0.00 0.00 0.00 0.75abc 0.13 0.00 TD2344-02 0.8EC 0.035 lb. (AI)/acre 0.00 0.00 0.38b 0.00b 0.13ab Confirm + 8.0 oz/acre 0.38 0.00 0.00 0.50 0.00 0.00 0.88ab 0.38b 0.13 0.00 0.00b 0.13ab Latron CS-7 0.06% v/v Means within a column followed by different letters are significantly different (P < 0.05, Tukey' s HSD, a = 0.05); Data transformed for analysis with log(x + 1) "All treatments except Confirm/Latron also contained Silwet L-77 at a rate of 0.14% v/v.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 1997

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