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APHID CONTROL WITH BIOPESTICIDES IN COLLARD, 2010

APHID CONTROL WITH BIOPESTICIDES IN COLLARD, 2010 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E23 (E23) COLLARD: Brassica oleracea L. var. acephala DC., ‘Georgia Southern’ Ayanava Majumdar Gulf Coast Research and Extension Center 8300 State Hwy 104 Fairhope, AL 36532 Phone: 251-331-8416 Fax: 251-990-8912 email: azm0024@auburn.edu James R. Akridge Brewton Agricultural Research Unit 2067 Kirkland Road Brewton, AL 36427 Phone: 251-867-3139 Fax: 251-867-9433 email: jakridge@auburn.edu Green peach aphid (GPA): Myzus persicae (Sulzer) The objective of this experiment was to evaluate environmental-friendly insecticide tank mixes for aphid management on collards. GPA is a major pest of collards and presence of the insect pest in low numbers can contaminate fresh-market produce. An experiment was conducted at the Brewton Agricultural Research Unit at Brewton, AL, in 2010 to test three biopesticides as tank mix or rotation partners with the goal of developing alternative pest management strategies. Collards were planted on 24 Sep in 4 ft by 20 ft (1.2 m by 6 m) plots and harvested on 14 Dec. Each test plot had three rows of collards. Five insecticide treatments and an untreated check were replicated four times in a RCB design. All treatments were applied using a tractor-mounted sprayer with an output of 42 gpa at 40 psi. Insecticidal treatments were applied weekly on 15, 22 and 29 Nov after aphids were detected. Aphid numbers on the underside of leaves were counted from 10 random plants in the middle of each plot. Aphid counts were completed prior to the first insecticide application (10 Nov) and then at weekly intervals till 6 Dec in order to evaluate the effect of insecticidal treatments. Data were analyzed using ANOVA and LSD procedures. Aphid populations peaked after mid-Nov and declined rapidly after the first frost (Dec). The numerical differences in GPA numbers between the untreated check and treated plots on two post-treatment observations were not statistically significant (Table 1). Aphid counts taken on 22 Nov were statistically significant and essentially indicated the benefit of BotaniGard + Molt-X tank mix, alternated with Suffoil-X. No phytotoxicity was observed on collards from any tested formulations. Overall, Molt-X (botanical formulation), Suffoil-X (paraffinic oil), and BotaniGard (mycoinsecticide) had a combined efficacy better than the chemical standard in this study. Seasonal mean totals in Table 1 indicate the relative strengths of biopesticide tank mixes compared to the untreated check that had a high aphid infestation level. Further studies will be undertaken to corroborate the trends reported herein. This research was supported by industry gift of BioWorks Inc., Victor, NY. Table 1. Mean aphid numbers on 10 random collard plants Primary treatment (PT) Insecticide rotation Rate amt Seasonal (1 wk after PT) product/acre 10-Nov 22-Nov 29-Nov 6-Dec meantotal BotaniGard + Molt-X (tank mixed) Repeat 32 fl oz 0a 4.75b 3.75ab 0ab 8.5 BotaniGard + Molt-X (tank mixed) Molt-X Various 0.5a 5.75b 0ab 0ab 6.25 BotaniGard Molt-X + Suffoil-X Various 1.0a 0b 0ab 0ab 1.00 (tank mixed) BotaniGard + Molt-X (tank mixed) Suffoil-X Various 0a 0b 0ab 0ab 0.00 Mustang Max EC Repeat 4 fl oz 2.5a 0.25b 0.75ab 0ab 3.5 Untreated Check 0a 31.5a 108.0a 40.0a 179.5 Result NS *** NS NS Means within a column followed by the same letter(s) are not significantly different (LSD; P=0.05). Primary treatment was continued at 7 day interval. BotaniGard at 32 fl oz/acre, Molt-X at 10 fl oz/acre, and/or Suffoil-X at 128 fl oz/acre. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

APHID CONTROL WITH BIOPESTICIDES IN COLLARD, 2010

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10.4182/amt.2012.E23
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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E23 (E23) COLLARD: Brassica oleracea L. var. acephala DC., ‘Georgia Southern’ Ayanava Majumdar Gulf Coast Research and Extension Center 8300 State Hwy 104 Fairhope, AL 36532 Phone: 251-331-8416 Fax: 251-990-8912 email: azm0024@auburn.edu James R. Akridge Brewton Agricultural Research Unit 2067 Kirkland Road Brewton, AL 36427 Phone: 251-867-3139 Fax: 251-867-9433 email: jakridge@auburn.edu Green peach aphid (GPA): Myzus persicae (Sulzer) The objective of this experiment was to evaluate environmental-friendly insecticide tank mixes for aphid management on collards. GPA is a major pest of collards and presence of the insect pest in low numbers can contaminate fresh-market produce. An experiment was conducted at the Brewton Agricultural Research Unit at Brewton, AL, in 2010 to test three biopesticides as tank mix or rotation partners with the goal of developing alternative pest management strategies. Collards were planted on 24 Sep in 4 ft by 20 ft (1.2 m by 6 m) plots and harvested on 14 Dec. Each test plot had three rows of collards. Five insecticide treatments and an untreated check were replicated four times in a RCB design. All treatments were applied using a tractor-mounted sprayer with an output of 42 gpa at 40 psi. Insecticidal treatments were applied weekly on 15, 22 and 29 Nov after aphids were detected. Aphid numbers on the underside of leaves were counted from 10 random plants in the middle of each plot. Aphid counts were completed prior to the first insecticide application (10 Nov) and then at weekly intervals till 6 Dec in order to evaluate the effect of insecticidal treatments. Data were analyzed using ANOVA and LSD procedures. Aphid populations peaked after mid-Nov and declined rapidly after the first frost (Dec). The numerical differences in GPA numbers between the untreated check and treated plots on two post-treatment observations were not statistically significant (Table 1). Aphid counts taken on 22 Nov were statistically significant and essentially indicated the benefit of BotaniGard + Molt-X tank mix, alternated with Suffoil-X. No phytotoxicity was observed on collards from any tested formulations. Overall, Molt-X (botanical formulation), Suffoil-X (paraffinic oil), and BotaniGard (mycoinsecticide) had a combined efficacy better than the chemical standard in this study. Seasonal mean totals in Table 1 indicate the relative strengths of biopesticide tank mixes compared to the untreated check that had a high aphid infestation level. Further studies will be undertaken to corroborate the trends reported herein. This research was supported by industry gift of BioWorks Inc., Victor, NY. Table 1. Mean aphid numbers on 10 random collard plants Primary treatment (PT) Insecticide rotation Rate amt Seasonal (1 wk after PT) product/acre 10-Nov 22-Nov 29-Nov 6-Dec meantotal BotaniGard + Molt-X (tank mixed) Repeat 32 fl oz 0a 4.75b 3.75ab 0ab 8.5 BotaniGard + Molt-X (tank mixed) Molt-X Various 0.5a 5.75b 0ab 0ab 6.25 BotaniGard Molt-X + Suffoil-X Various 1.0a 0b 0ab 0ab 1.00 (tank mixed) BotaniGard + Molt-X (tank mixed) Suffoil-X Various 0a 0b 0ab 0ab 0.00 Mustang Max EC Repeat 4 fl oz 2.5a 0.25b 0.75ab 0ab 3.5 Untreated Check 0a 31.5a 108.0a 40.0a 179.5 Result NS *** NS NS Means within a column followed by the same letter(s) are not significantly different (LSD; P=0.05). Primary treatment was continued at 7 day interval. BotaniGard at 32 fl oz/acre, Molt-X at 10 fl oz/acre, and/or Suffoil-X at 128 fl oz/acre.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2012

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