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EVALUATION OF FOLIAR INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN SUMMER SQUASH IN VIRGINIA, 2011

EVALUATION OF FOLIAR INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN SUMMER SQUASH IN VIRGINIA,... Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E56 (E56) SQUASH: Cucurbita pepo ‘Gentry’ EVALUATION OF FOLIAR INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN SUMMER SQUASH IN VIRGINIA, 2011 Thomas P. Kuhar Department of Entomology Virginia Tech 216 Price Hall Blacksburg, VA 24061-0319 Phone: (540)231-6129 E-mail: tkuhar@vt.edu Hélène Doughty Adam Wimer James Jenrette Melon aphid (MA): Aphis gossypii Glover Striped cucumber beetle (SCB): Accalymma vittatum (Fabricius) Squash vine borer: Melittia cucurbitae (Harris) The objective of this experiment was to assess the efficacy of foliar insecticides for the control of foliar insects in summer squash. The trial consisted of 9 treatments arranged in a RCB design with four replicates. Squash were planted on 28 Jul at the Virginia Tech ESAREC near Painter, VA. Plots were 1 row wide and 20 ft (6.1 m) long with no guard rows. Rows were planted on a 6 ft row center (1.8 m) in a 4 tier field design, 6 ft (1.8 m) alleys between tiers. Foliar treatments were applied on 23, 30 Aug and 7 Sep at 34 gpa using a 3-nozzle boom equipped with D3 spray tips and 45 cores, powered by a CO backpack sprayer set at 40 psi. On 30 Aug, 6, 13 and 22 Sep, the number of MA was recorded per 10 leaves. On 30 Aug, 6 and 13 Sep, the number of SCB was recorded per 5 plants. On 13 Sep, the number of healthy plants (not SVB damaged) was recorded per row. All data were analyzed using ANOVA. Means were separated using Fisher’s Protected LSD at the 0.05 level of significance. Melon aphid pressure was moderately high with 179.3 aphids per 10 leaves in the untreated check on 6 Sep. HGW86 10SE had significantly lower numbers of aphids than the untreated check on all dates. Asana XL and Warrior II considerably flared aphids (Table 1). No differences were detected among the treatments for levels of SCB using ANOVA (Table 2). SVB pressure was very low (Table 2). Asana, Coragen, HGW86 at the highest rate and Warrior II had more healthy plants per plot than the untreated check. Plants within plots displayed no phytotoxicity symptoms following insecticide treatments. This research was supported by grants from DuPont. Table 1. Mean no. MA Treatment / Formulation Rate / acre 30 Aug 6 Sep 13 Sep 22 Sep Untreated check 145.8b 179.3bc 135.0b 40.0ab HGW86 10SE + MSO 10.1 fl oz + 0.25 % v/v 15.5cd 19.8c 2.0b 2.5b HGW86 10SE + MSO 13.5 fl oz + 0.25% v/v 15.3cd 3.8c 7.8b 5.0b HGW86 10SE + MSO 16.9 fl oz + 0.25% v/v 4.0d 6.3c 1.5b 2.5b HGW86 10SE + MSO 20.5 fl oz + 0.25% v/v 5.0d 5.5c 6.3b 0.0b Asana XL + MSO 8 fl oz + 0.25% v/v 102.5bc 516.0ab 291.3b 32.3ab Coragen + MSO 3.5 fl oz + 0.25% v/v 13.3cd 133.3c 60.0b 54.5a Coragen + MSO 5 fl oz + 0.25% v/v 10.3cd 28.0c 84.3b 36.3ab Warrior II 1.92 fl oz 254.5a 813.0a 2911.3a 76.3a All data were analyzed using ANOVA. Means were separated using Fisher’s LSD at the 0.05 level of significance. Means followed by the same letter within a column are not significantly different (P>0.05). 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E56 Table 2. Mean no. SCB Mean no. Treatment / healthy plants Formulation Rate / acre 30 Aug (not SVB damaged) Untreated check 7.5 6.8 HGW86 10SE + MSO 10.1 fl oz + 0.25 % v/v 8.5 7.0 HGW86 10SE + MSO 13.5 fl oz + 0.25% v/v 7.0 9.3 HGW86 10SE + MSO 16.9 fl oz + 0.25% v/v 4.0 10.5 HGW86 10SE + MSO 20.5 fl oz + 0.25% v/v 5.3 13.3 Asana XL + MSO 8 fl oz + 0.25% v/v 5.3 12.8 Coragen + MSO 3.5 fl oz + 0.25% v/v 6.3 14.3 Coragen + MSO 5 fl oz + 0.25% v/v 6.0 7.5 Warrior II 1.92 fl oz 4.5 11.5 All data were analyzed using ANOVA. Means were separated using Fisher’s LSD at the 0.05 level of significance. Means followed by the same letter within a column are not significantly different (P>0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF FOLIAR INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN SUMMER SQUASH IN VIRGINIA, 2011

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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E56 (E56) SQUASH: Cucurbita pepo ‘Gentry’ EVALUATION OF FOLIAR INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN SUMMER SQUASH IN VIRGINIA, 2011 Thomas P. Kuhar Department of Entomology Virginia Tech 216 Price Hall Blacksburg, VA 24061-0319 Phone: (540)231-6129 E-mail: tkuhar@vt.edu Hélène Doughty Adam Wimer James Jenrette Melon aphid (MA): Aphis gossypii Glover Striped cucumber beetle (SCB): Accalymma vittatum (Fabricius) Squash vine borer: Melittia cucurbitae (Harris) The objective of this experiment was to assess the efficacy of foliar insecticides for the control of foliar insects in summer squash. The trial consisted of 9 treatments arranged in a RCB design with four replicates. Squash were planted on 28 Jul at the Virginia Tech ESAREC near Painter, VA. Plots were 1 row wide and 20 ft (6.1 m) long with no guard rows. Rows were planted on a 6 ft row center (1.8 m) in a 4 tier field design, 6 ft (1.8 m) alleys between tiers. Foliar treatments were applied on 23, 30 Aug and 7 Sep at 34 gpa using a 3-nozzle boom equipped with D3 spray tips and 45 cores, powered by a CO backpack sprayer set at 40 psi. On 30 Aug, 6, 13 and 22 Sep, the number of MA was recorded per 10 leaves. On 30 Aug, 6 and 13 Sep, the number of SCB was recorded per 5 plants. On 13 Sep, the number of healthy plants (not SVB damaged) was recorded per row. All data were analyzed using ANOVA. Means were separated using Fisher’s Protected LSD at the 0.05 level of significance. Melon aphid pressure was moderately high with 179.3 aphids per 10 leaves in the untreated check on 6 Sep. HGW86 10SE had significantly lower numbers of aphids than the untreated check on all dates. Asana XL and Warrior II considerably flared aphids (Table 1). No differences were detected among the treatments for levels of SCB using ANOVA (Table 2). SVB pressure was very low (Table 2). Asana, Coragen, HGW86 at the highest rate and Warrior II had more healthy plants per plot than the untreated check. Plants within plots displayed no phytotoxicity symptoms following insecticide treatments. This research was supported by grants from DuPont. Table 1. Mean no. MA Treatment / Formulation Rate / acre 30 Aug 6 Sep 13 Sep 22 Sep Untreated check 145.8b 179.3bc 135.0b 40.0ab HGW86 10SE + MSO 10.1 fl oz + 0.25 % v/v 15.5cd 19.8c 2.0b 2.5b HGW86 10SE + MSO 13.5 fl oz + 0.25% v/v 15.3cd 3.8c 7.8b 5.0b HGW86 10SE + MSO 16.9 fl oz + 0.25% v/v 4.0d 6.3c 1.5b 2.5b HGW86 10SE + MSO 20.5 fl oz + 0.25% v/v 5.0d 5.5c 6.3b 0.0b Asana XL + MSO 8 fl oz + 0.25% v/v 102.5bc 516.0ab 291.3b 32.3ab Coragen + MSO 3.5 fl oz + 0.25% v/v 13.3cd 133.3c 60.0b 54.5a Coragen + MSO 5 fl oz + 0.25% v/v 10.3cd 28.0c 84.3b 36.3ab Warrior II 1.92 fl oz 254.5a 813.0a 2911.3a 76.3a All data were analyzed using ANOVA. Means were separated using Fisher’s LSD at the 0.05 level of significance. Means followed by the same letter within a column are not significantly different (P>0.05). 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E56 Table 2. Mean no. SCB Mean no. Treatment / healthy plants Formulation Rate / acre 30 Aug (not SVB damaged) Untreated check 7.5 6.8 HGW86 10SE + MSO 10.1 fl oz + 0.25 % v/v 8.5 7.0 HGW86 10SE + MSO 13.5 fl oz + 0.25% v/v 7.0 9.3 HGW86 10SE + MSO 16.9 fl oz + 0.25% v/v 4.0 10.5 HGW86 10SE + MSO 20.5 fl oz + 0.25% v/v 5.3 13.3 Asana XL + MSO 8 fl oz + 0.25% v/v 5.3 12.8 Coragen + MSO 3.5 fl oz + 0.25% v/v 6.3 14.3 Coragen + MSO 5 fl oz + 0.25% v/v 6.0 7.5 Warrior II 1.92 fl oz 4.5 11.5 All data were analyzed using ANOVA. Means were separated using Fisher’s LSD at the 0.05 level of significance. Means followed by the same letter within a column are not significantly different (P>0.05).

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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