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CITRUS THRIPS CONTROL IN ORGANIC SOUTHERN HIGHBUSH BLUEBERRIES IN CALIFORNIA, 2007

CITRUS THRIPS CONTROL IN ORGANIC SOUTHERN HIGHBUSH BLUEBERRIES IN CALIFORNIA, 2007 (C6) BLUEBERRY: Vaccinium corymbosum L. David R. Haviland University of California Cooperative Extension, Kern County 1031 South Mount Vernon Ave. Bakersfield, CA 93307 Phone: (661) 868-6215 Fax: (661) 868-6208 E-mail: dhaviland@ucdavis.edu Stephanie M. Rill University of California Cooperative Extension, Kern County 1031 South Mount Vernon Ave. Bakersfield, CA 93907 Citrus thrips: Scirtothrips citri (Moulton) This test evaluated the effects of insecticides for potential use for citrus thrips control in organic blueberries. The trial was located near Richgrove, Tulare Co., CA in a 3.8 acre portion of a mature blueberry field with each plot measuring 4 rows (44 ft) by 58 ft long. Plots were organized into a RCBD with 4 blocks of 15 treatments and an untreated check. Treatments were applied at 100 gpa on 7 Aug 2007 using a commercial tractor-pulled sprayer with nozzles located on wrap-around booms. Nozzles on each boom were directed towards the blueberry canopy and penetration was facilitated by fans. A second treatment of each product was applied a week later on 15 Aug 2007 using the same method. The effects of insecticide treatments were evaluated by taking 10 beat samples from the center two rows of each plot on each evaluation date. This was done by beating the terminal 6 in of new flush growth from an un-branched shoot onto a black, 12-in by 12- in piece of acrylic, and then counting the thrips. Evaluations were done on 6 Aug (pre-counts), 8 Aug (3 DAT1), 14 Aug (7 DAT1), 17 Aug (2 DAT2), 21 Aug (6DAT2), 24 Aug (9 DAT2), and 27 Aug (12 DAT2). Data were analyzed by ANOVA using transformed data (square root (x + 0.5)) with means separated by Fisher’s Protected LSD at P > 0.05. Table 1 shows the effects of treatments on the density of citrus thrips. By 3 DAT1, Entrust and Veratran D + Molasses lowered thrips counts below 10 thrips per beat sample and were the only insecticides to result in significant reductions compared to the untreated check. By 7DAT1 and 2 DAT2 Surround and Food Grade d-Limonene also resulted in significant reductions in thrips density. There were no significant differences on the 6DAT2 evaluations. On the final evaluation date, plots treated with Entrust were the only plots with at least a 50% reduction in thrips compared to the untreated check. Table 1. Rate form Mean no. of citrus thrips per ten beat samples prod/acre or v/v Pre 3DAT1 7DAT1 2DAT2 6DAT2 9DAT2 Entrust 2 oz 29.3a 4.3a 7.9a 6.0a 8.9a 11.8a Veratran D + 15 lb + Molasses 1 gal 31.6a 7.7a 10.5ab 4.5ab 11.4a 26.4bcde Surround WP 50 lb 34.3a 19.5b 11.1abc 6.6abc 17.5a 20.4abcd Food Grade d-Limonene 0.5 % 24.5a 20.6bc 16.5bcd 10.8abcde 16.9a 15.9ab JMS Stylet Oil 1.5 % 28.8a 22.0bcd 20.7cd 17.4cdef 25.7a 24.7bcde 415 Oil 2 % 32.2a 22.6bcd 24.3d 13.1bcde 18.7a 26.8cde M-Pede 49L 2 % 31.9a 23.2bcd 18.5bcd 17.9ef 24.8a 31.3e First choice 9300 Vegetable Oil 4 % 36.4a 23.6bcd 19.7bcd 16.8def 17.0a 17.2abc QRD 400 1 % 30.2a 23.7bcd 21.3cd 14.2bcdef 20.9a 19.1abcd Pyganic 1.4EC 7 pt 33.4a 24.6bcd 28.1d 15.0cdef 18.2a 25.5bcde Ecotrol 10EC 1 % 27.9a 26.2bcd 18.9bcd 14.8cdef 25.7a 18.2abc Trilogy 2 % 30.3a 26.3bcd 23.5d 24.0f 13.4a 22.7bcde SeaSide 1 % 30.4a 28.8cd 16.5bcd 11.9bcde 14.7a 24.9bcde Orosorb 1 % 36.1a 30.3d 26.3d 17.9def 20.7a 29.3de Biolink 0.5 % 34.0a 31.7d 27.9d 8.1abcd 13.2a 16.4abc Untreated --- 38.5a 32.7bcd 28.2d 16.8 def 24.5a 31.6e R-11 used as a surfactant at 0.25% v/v. Means in a column followed by the same letter are not significantly different. (P > 0.05, Fisher’s protected LSD) after square root (x + 0.5) transformation of the data. Untransformed means are shown. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CITRUS THRIPS CONTROL IN ORGANIC SOUTHERN HIGHBUSH BLUEBERRIES IN CALIFORNIA, 2007

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10.1093/amt/33.1.C6
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Abstract

(C6) BLUEBERRY: Vaccinium corymbosum L. David R. Haviland University of California Cooperative Extension, Kern County 1031 South Mount Vernon Ave. Bakersfield, CA 93307 Phone: (661) 868-6215 Fax: (661) 868-6208 E-mail: dhaviland@ucdavis.edu Stephanie M. Rill University of California Cooperative Extension, Kern County 1031 South Mount Vernon Ave. Bakersfield, CA 93907 Citrus thrips: Scirtothrips citri (Moulton) This test evaluated the effects of insecticides for potential use for citrus thrips control in organic blueberries. The trial was located near Richgrove, Tulare Co., CA in a 3.8 acre portion of a mature blueberry field with each plot measuring 4 rows (44 ft) by 58 ft long. Plots were organized into a RCBD with 4 blocks of 15 treatments and an untreated check. Treatments were applied at 100 gpa on 7 Aug 2007 using a commercial tractor-pulled sprayer with nozzles located on wrap-around booms. Nozzles on each boom were directed towards the blueberry canopy and penetration was facilitated by fans. A second treatment of each product was applied a week later on 15 Aug 2007 using the same method. The effects of insecticide treatments were evaluated by taking 10 beat samples from the center two rows of each plot on each evaluation date. This was done by beating the terminal 6 in of new flush growth from an un-branched shoot onto a black, 12-in by 12- in piece of acrylic, and then counting the thrips. Evaluations were done on 6 Aug (pre-counts), 8 Aug (3 DAT1), 14 Aug (7 DAT1), 17 Aug (2 DAT2), 21 Aug (6DAT2), 24 Aug (9 DAT2), and 27 Aug (12 DAT2). Data were analyzed by ANOVA using transformed data (square root (x + 0.5)) with means separated by Fisher’s Protected LSD at P > 0.05. Table 1 shows the effects of treatments on the density of citrus thrips. By 3 DAT1, Entrust and Veratran D + Molasses lowered thrips counts below 10 thrips per beat sample and were the only insecticides to result in significant reductions compared to the untreated check. By 7DAT1 and 2 DAT2 Surround and Food Grade d-Limonene also resulted in significant reductions in thrips density. There were no significant differences on the 6DAT2 evaluations. On the final evaluation date, plots treated with Entrust were the only plots with at least a 50% reduction in thrips compared to the untreated check. Table 1. Rate form Mean no. of citrus thrips per ten beat samples prod/acre or v/v Pre 3DAT1 7DAT1 2DAT2 6DAT2 9DAT2 Entrust 2 oz 29.3a 4.3a 7.9a 6.0a 8.9a 11.8a Veratran D + 15 lb + Molasses 1 gal 31.6a 7.7a 10.5ab 4.5ab 11.4a 26.4bcde Surround WP 50 lb 34.3a 19.5b 11.1abc 6.6abc 17.5a 20.4abcd Food Grade d-Limonene 0.5 % 24.5a 20.6bc 16.5bcd 10.8abcde 16.9a 15.9ab JMS Stylet Oil 1.5 % 28.8a 22.0bcd 20.7cd 17.4cdef 25.7a 24.7bcde 415 Oil 2 % 32.2a 22.6bcd 24.3d 13.1bcde 18.7a 26.8cde M-Pede 49L 2 % 31.9a 23.2bcd 18.5bcd 17.9ef 24.8a 31.3e First choice 9300 Vegetable Oil 4 % 36.4a 23.6bcd 19.7bcd 16.8def 17.0a 17.2abc QRD 400 1 % 30.2a 23.7bcd 21.3cd 14.2bcdef 20.9a 19.1abcd Pyganic 1.4EC 7 pt 33.4a 24.6bcd 28.1d 15.0cdef 18.2a 25.5bcde Ecotrol 10EC 1 % 27.9a 26.2bcd 18.9bcd 14.8cdef 25.7a 18.2abc Trilogy 2 % 30.3a 26.3bcd 23.5d 24.0f 13.4a 22.7bcde SeaSide 1 % 30.4a 28.8cd 16.5bcd 11.9bcde 14.7a 24.9bcde Orosorb 1 % 36.1a 30.3d 26.3d 17.9def 20.7a 29.3de Biolink 0.5 % 34.0a 31.7d 27.9d 8.1abcd 13.2a 16.4abc Untreated --- 38.5a 32.7bcd 28.2d 16.8 def 24.5a 31.6e R-11 used as a surfactant at 0.25% v/v. Means in a column followed by the same letter are not significantly different. (P > 0.05, Fisher’s protected LSD) after square root (x + 0.5) transformation of the data. Untransformed means are shown.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2008

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