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INSECTICIDE EFFICACY AGAINST WORM PESTS IN CABBAGE, 2012

INSECTICIDE EFFICACY AGAINST WORM PESTS IN CABBAGE, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E12 (E12) CABBAGE: Brassica oleracea L. var. capitata L. ‘Headstart’ Eric T. Natwick University of California Agriculture and Natural Resources Desert Research and Extension Center 1050 E. Holton Rd. Holtville, CA 92250 Phone: (760) 352-9474 Fax: (760) 352-0846 E-mail: etnatwick@ucdavis.edu Beet armyworm (BAW): Spodoptera exigua (Hübner) Cabbage looper (CL): Trichoplusia ni (Hübner) The objective of the study was to evaluate the efficacy of various insecticides against worm pests (BAW and CL) on cabbage under desert growing conditions. Cabbage (Headstart) was direct seeded on 11 Sep 2012 at the University of California Desert Research and Extension Center, El Centro, CA into double row beds on 40 inch centers. Stand establishment was achieved using overhead sprinkler irrigation, and furrow irrigation was used thereafter. Plots were four beds 13.3 ft wide by 40 ft long and bordered by one untreated bed. Four replications of each treatment were arranged in a RCB design. Insecticidal compounds, formulations and application rates along with treatment dates are provided in the tables. All insecticide treatments were foliar sprays applied on 5 Oct and 19 Oct 2012 with a Lee Spider Spray Trac Tractor, 4-row sprayer with three TJ-60 11003VS nozzles per row that delivered 53 gpa at 30 psi. DuPont TN MSO-D-17F0684 100% methylated seed oil was added to each foliar spray mixture at 0.5% vol/vol. Numbers of BAW and CL from 10 plants per plot in each replicate were recorded on 4 Oct, one day prior to insecticide applications (1DPT) and on each of the following sampling dates and days after treatment (DAT) indicated: 8 Oct (3DAT1), 18 Oct (13DAT1), 22 Oct (3DAT2), 29 Oct (10DAT2), and 5 Nov, (17DAT2). Data were analyzed using ANOVA. Differences among means on each sampling date and in each experiment were determined using Least Significant Difference Test (P=0.05). BAW pressure was low but differences were detected among the treatments on 18 Oct (13DAT1) and for the post treatment average (PTA) where all insecticide treatments had significantly fewer BAW than the untreated check, Table 1. There were no differences among the treatments for BAW larvae on any of the other sampling dates. CL pressure was normal compared to past years. There were no differences among the treatments for CL larvae on 4 Oct, 1- day prior to insecticide treatments (1DPT), Table 2. All insecticide treatments had means for CL larvae that were significantly lower than the means for untreated check treatment on all post-treatment sampling dates except on 18 Oct (13DAT1) when none of the insecticide treatments had means for CL larvae that were significantly lower than the mean for untreated check. The PTA for each of the insecticide treatments was significantly lower than the PTA for the check. There were no visible symptoms of phytotoxicity following any of the insecticide treatments. This research was supported by industry gifts. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E12 Table 1. BAW per ten plants 4 Oct 8 Oct 18 Oct 22 Oct 29 Oct 5 Nov Treatment Oz/acre 1DPT 3DAT1 13DAT1 3DAT2 10DAT2 17DAT2 PTA DPX-KN128 30 WG 3.5 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.25a 0.05b DPX-KN128 30 WG 6.0 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.25a 0.05b Avaunt 30 WG 3.5 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.00a 0.00b Avaunt 30 WG 6.0 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.25a 0.05b Coragen SC 5.0 fl 0.00a 0.00a 0.00b 0.00a 0.00a 0.00a 0.00b Radiant SC 5.0 fl 0.25a 0.00a 0.00b 0.00a 0.00a 0.00a 0.00b Check --- 0.25a 0.25a 1.00a 0.75a 0.25a 0.50a 0.55a Means within columns followed by the same letter are not significantly different, P > 0.05, LSD. DPT = Days prior to treatment. DAT = Days after treatment. PTA = Post treatment average. Table 2. CL per ten plants 4 Oct 8 Oct 18 Oct 22 Oct 29 Oct 5 Nov Treatment Oz/acre 1DPT 3DAT1 13DAT1 3DAT2 10DAT2 17DAT2 PTA DPX-KN128 30 WG 3.5 dry 1.25a 0.00b 0.00a 0.00b 0.50b 1.25bc 0.35b DPX-KN128 30 WG 6.0 dry 1.00a 0.00b 0.25a 0.00b 0.00b 2.25b 0.50b Avaunt 30 WG 3.5 dry 1.50a 0.00b 0.00a 0.00b 0.75b 1.00bc 0.35b Avaunt 30 WG 6.0 dry 0.00a 0.00b 0.00a 0.00b 0.00b 1.00bc 0.20b Coragen SC 5.0 fl 0.00a 0.00b 0.00a 0.00b 0.00b 0.75c 0.15b Radiant SC 5.0 fl 2.75a 0.00b 0.00a 0.00b 0.00b 0.75c 0.15b Check --- 2.00a 2.50a 1.00a 1.00a 4.50a 8.50a 3.50a Means within columns followed by the same letter are not significantly different, P > 0.05, LSD. DPT = Days prior to treatment. DAT = Days after treatment. PTA = Post treatment average. Log transformed data uses for analysis, but actual means are shown in the table. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

INSECTICIDE EFFICACY AGAINST WORM PESTS IN CABBAGE, 2012

Arthropod Management Tests , Volume 38 (1) – Jan 1, 2013

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Abstract

Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E12 (E12) CABBAGE: Brassica oleracea L. var. capitata L. ‘Headstart’ Eric T. Natwick University of California Agriculture and Natural Resources Desert Research and Extension Center 1050 E. Holton Rd. Holtville, CA 92250 Phone: (760) 352-9474 Fax: (760) 352-0846 E-mail: etnatwick@ucdavis.edu Beet armyworm (BAW): Spodoptera exigua (Hübner) Cabbage looper (CL): Trichoplusia ni (Hübner) The objective of the study was to evaluate the efficacy of various insecticides against worm pests (BAW and CL) on cabbage under desert growing conditions. Cabbage (Headstart) was direct seeded on 11 Sep 2012 at the University of California Desert Research and Extension Center, El Centro, CA into double row beds on 40 inch centers. Stand establishment was achieved using overhead sprinkler irrigation, and furrow irrigation was used thereafter. Plots were four beds 13.3 ft wide by 40 ft long and bordered by one untreated bed. Four replications of each treatment were arranged in a RCB design. Insecticidal compounds, formulations and application rates along with treatment dates are provided in the tables. All insecticide treatments were foliar sprays applied on 5 Oct and 19 Oct 2012 with a Lee Spider Spray Trac Tractor, 4-row sprayer with three TJ-60 11003VS nozzles per row that delivered 53 gpa at 30 psi. DuPont TN MSO-D-17F0684 100% methylated seed oil was added to each foliar spray mixture at 0.5% vol/vol. Numbers of BAW and CL from 10 plants per plot in each replicate were recorded on 4 Oct, one day prior to insecticide applications (1DPT) and on each of the following sampling dates and days after treatment (DAT) indicated: 8 Oct (3DAT1), 18 Oct (13DAT1), 22 Oct (3DAT2), 29 Oct (10DAT2), and 5 Nov, (17DAT2). Data were analyzed using ANOVA. Differences among means on each sampling date and in each experiment were determined using Least Significant Difference Test (P=0.05). BAW pressure was low but differences were detected among the treatments on 18 Oct (13DAT1) and for the post treatment average (PTA) where all insecticide treatments had significantly fewer BAW than the untreated check, Table 1. There were no differences among the treatments for BAW larvae on any of the other sampling dates. CL pressure was normal compared to past years. There were no differences among the treatments for CL larvae on 4 Oct, 1- day prior to insecticide treatments (1DPT), Table 2. All insecticide treatments had means for CL larvae that were significantly lower than the means for untreated check treatment on all post-treatment sampling dates except on 18 Oct (13DAT1) when none of the insecticide treatments had means for CL larvae that were significantly lower than the mean for untreated check. The PTA for each of the insecticide treatments was significantly lower than the PTA for the check. There were no visible symptoms of phytotoxicity following any of the insecticide treatments. This research was supported by industry gifts. 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E12 Table 1. BAW per ten plants 4 Oct 8 Oct 18 Oct 22 Oct 29 Oct 5 Nov Treatment Oz/acre 1DPT 3DAT1 13DAT1 3DAT2 10DAT2 17DAT2 PTA DPX-KN128 30 WG 3.5 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.25a 0.05b DPX-KN128 30 WG 6.0 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.25a 0.05b Avaunt 30 WG 3.5 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.00a 0.00b Avaunt 30 WG 6.0 dry 0.00a 0.00a 0.00b 0.00a 0.00a 0.25a 0.05b Coragen SC 5.0 fl 0.00a 0.00a 0.00b 0.00a 0.00a 0.00a 0.00b Radiant SC 5.0 fl 0.25a 0.00a 0.00b 0.00a 0.00a 0.00a 0.00b Check --- 0.25a 0.25a 1.00a 0.75a 0.25a 0.50a 0.55a Means within columns followed by the same letter are not significantly different, P > 0.05, LSD. DPT = Days prior to treatment. DAT = Days after treatment. PTA = Post treatment average. Table 2. CL per ten plants 4 Oct 8 Oct 18 Oct 22 Oct 29 Oct 5 Nov Treatment Oz/acre 1DPT 3DAT1 13DAT1 3DAT2 10DAT2 17DAT2 PTA DPX-KN128 30 WG 3.5 dry 1.25a 0.00b 0.00a 0.00b 0.50b 1.25bc 0.35b DPX-KN128 30 WG 6.0 dry 1.00a 0.00b 0.25a 0.00b 0.00b 2.25b 0.50b Avaunt 30 WG 3.5 dry 1.50a 0.00b 0.00a 0.00b 0.75b 1.00bc 0.35b Avaunt 30 WG 6.0 dry 0.00a 0.00b 0.00a 0.00b 0.00b 1.00bc 0.20b Coragen SC 5.0 fl 0.00a 0.00b 0.00a 0.00b 0.00b 0.75c 0.15b Radiant SC 5.0 fl 2.75a 0.00b 0.00a 0.00b 0.00b 0.75c 0.15b Check --- 2.00a 2.50a 1.00a 1.00a 4.50a 8.50a 3.50a Means within columns followed by the same letter are not significantly different, P > 0.05, LSD. DPT = Days prior to treatment. DAT = Days after treatment. PTA = Post treatment average. Log transformed data uses for analysis, but actual means are shown in the table.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2013

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