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FLEA BEETLE CONTOL WITH INSECTICDES ALLOWED FOR ORGANIC PRODUCTION, 2012

FLEA BEETLE CONTOL WITH INSECTICDES ALLOWED FOR ORGANIC PRODUCTION, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E14 (E14) CABBAGE: Brassica olearacea L., ‘Capture F1’ Abby Seaman New York State Integrated Pest Management Program Cornell University 630 W. North St. Geneva, NY 14456 Phone: 315-787-2422 Fax: 315-787-2360 E-mail: ajs32@cornell.edu Holly Lange E-mail: hlw7@cornell.edu Anthony M. Shelton E-mail: ajs32@cornell.edu Cabbage flea beetle: Phyllotreta cruciferae (Goeze) Striped flea beetle: Phyllotreta striolata This trial was conducted to evaluate insecticides allowed for organic production. The trial was conducted within a field managed using practices allowed for organic production since 2008 at the New York State Experiment Station in Geneva, NY. An overwintered oat cover crop was plowed under in May. Cabbage (‘Capture F1’) with 3-4 true leaves was transplanted on 22 May. The transplants were set by hand using a water wheel transplanter with a solution of 0.5oz/gal Fertrell fish oil emulsion into raised beds with 1.25 mil black polyethylene and drip irrigation. A 5-5-3 granular fertilizer was applied at a rate of 18 lb/acre under the plastic mulch as it was put down. Annual ryegrass was seeded between the rows for weed control and mowed as needed. Four treatments and an untreated control were arranged in a RCB design with four replications. Each plot consisted of five plants spaced 12 inch apart with 7 ft between rows and 2 ft between treatments. Sprays (with the exception of Surround) were applied with a CO pressurized backpack sprayer at 40 psi delivering 40 gal/acre through two TeeJet 8002VS flat fan nozzles spaced 19 inch apart. Surround was applied using a hand pump pressurized sprayer with a single nozzle calibrated to deliver approximately 40 psi and 40 gal/acre. Treatments included Ecotec (rosemary, peppermint, and wintergreen oils) at 4 pt/acre Entrust 80 WP (spinosad) at 2.5 oz/acre, row cover (Agrofabric Pro 17 bonded 5oz fabric, 6 ft wide), and an untreated control. The row cover was applied immediately after transplanting, anchored in place by stakes, and edges sealed with soil. The first spray was applied 26 May as soon as beetles began invading the plots. Three more sprays were applied on 4, 11 and 19 Jun. On 25 June plots were rated for damage using a 1-5 scale, with 1 being no damage and 5 being severe damage with plants nearly dead. Damage ratings were analyzed using the Kruskall-Wallis non-parametric test because of the qualitative nature of the data. Pair-wise Wilcoxon sign-ranked tests were carried out on damage ratings to separate treatments (Table 1). Average maximum temperatures for May and Jun were 74 and 76˚F respectively; average minimum temperatures were 52 and 59 ˚F. Rainfall amounts (in.) were 2.5 and 2.1 for May and Jun, respectively. The untreated control had a relatively mild damage rating of 2.1, but this was not significantly different from the Ecotec or Surround treatments. Entrust treatment significantly reduced damage compared with the untreated control. The spunbond row cover completely prevented insect damage but resulted in some plant damage due to abrasion and high temperature. Elevating the row cover on hoops may prevent or reduce damage. Tests under high flea beetle pressure will be necessary to confirm the results of Entrust, but should not influence the row cover results. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E14 Table 1 Treatment/ Rate amt. Mean damage formulation product/acre rating Untreated control 2.1a Ecotec 4 pt 1.8a Surround WP 0.5 lb/gal 1.6a Entrust 80 WP 2.5 oz 1.3b Row cover 1.0c Means followed by the same lower-case letters within a column are not significantly different (Wilcoxon sign ranked test, P<0.05) Damage rating on a scale of 1-5 with 1 being no damage and 5 being severe damage with plants nearly dead http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

FLEA BEETLE CONTOL WITH INSECTICDES ALLOWED FOR ORGANIC PRODUCTION, 2012

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Oxford University Press
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© Published by Oxford University Press.
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10.4182/amt.2013.E14
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Abstract

Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E14 (E14) CABBAGE: Brassica olearacea L., ‘Capture F1’ Abby Seaman New York State Integrated Pest Management Program Cornell University 630 W. North St. Geneva, NY 14456 Phone: 315-787-2422 Fax: 315-787-2360 E-mail: ajs32@cornell.edu Holly Lange E-mail: hlw7@cornell.edu Anthony M. Shelton E-mail: ajs32@cornell.edu Cabbage flea beetle: Phyllotreta cruciferae (Goeze) Striped flea beetle: Phyllotreta striolata This trial was conducted to evaluate insecticides allowed for organic production. The trial was conducted within a field managed using practices allowed for organic production since 2008 at the New York State Experiment Station in Geneva, NY. An overwintered oat cover crop was plowed under in May. Cabbage (‘Capture F1’) with 3-4 true leaves was transplanted on 22 May. The transplants were set by hand using a water wheel transplanter with a solution of 0.5oz/gal Fertrell fish oil emulsion into raised beds with 1.25 mil black polyethylene and drip irrigation. A 5-5-3 granular fertilizer was applied at a rate of 18 lb/acre under the plastic mulch as it was put down. Annual ryegrass was seeded between the rows for weed control and mowed as needed. Four treatments and an untreated control were arranged in a RCB design with four replications. Each plot consisted of five plants spaced 12 inch apart with 7 ft between rows and 2 ft between treatments. Sprays (with the exception of Surround) were applied with a CO pressurized backpack sprayer at 40 psi delivering 40 gal/acre through two TeeJet 8002VS flat fan nozzles spaced 19 inch apart. Surround was applied using a hand pump pressurized sprayer with a single nozzle calibrated to deliver approximately 40 psi and 40 gal/acre. Treatments included Ecotec (rosemary, peppermint, and wintergreen oils) at 4 pt/acre Entrust 80 WP (spinosad) at 2.5 oz/acre, row cover (Agrofabric Pro 17 bonded 5oz fabric, 6 ft wide), and an untreated control. The row cover was applied immediately after transplanting, anchored in place by stakes, and edges sealed with soil. The first spray was applied 26 May as soon as beetles began invading the plots. Three more sprays were applied on 4, 11 and 19 Jun. On 25 June plots were rated for damage using a 1-5 scale, with 1 being no damage and 5 being severe damage with plants nearly dead. Damage ratings were analyzed using the Kruskall-Wallis non-parametric test because of the qualitative nature of the data. Pair-wise Wilcoxon sign-ranked tests were carried out on damage ratings to separate treatments (Table 1). Average maximum temperatures for May and Jun were 74 and 76˚F respectively; average minimum temperatures were 52 and 59 ˚F. Rainfall amounts (in.) were 2.5 and 2.1 for May and Jun, respectively. The untreated control had a relatively mild damage rating of 2.1, but this was not significantly different from the Ecotec or Surround treatments. Entrust treatment significantly reduced damage compared with the untreated control. The spunbond row cover completely prevented insect damage but resulted in some plant damage due to abrasion and high temperature. Elevating the row cover on hoops may prevent or reduce damage. Tests under high flea beetle pressure will be necessary to confirm the results of Entrust, but should not influence the row cover results. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E14 Table 1 Treatment/ Rate amt. Mean damage formulation product/acre rating Untreated control 2.1a Ecotec 4 pt 1.8a Surround WP 0.5 lb/gal 1.6a Entrust 80 WP 2.5 oz 1.3b Row cover 1.0c Means followed by the same lower-case letters within a column are not significantly different (Wilcoxon sign ranked test, P<0.05) Damage rating on a scale of 1-5 with 1 being no damage and 5 being severe damage with plants nearly dead

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2013

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