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INSECTICIDE EFFICACY AGAINST WORM PESTS IN LETTUCE, 2012

INSECTICIDE EFFICACY AGAINST WORM PESTS IN LETTUCE, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E24 (E24) LETTUCE (HEAD): Lactuca sativa var. capitata L. ‘KEEPER’ 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): Tricholusia ni (Hübner) The objective of the study was to evaluate the efficacy of various worm control insecticides compared to an untreated check for early season worm pests on iceberg head lettuce under desert growing conditions. Head lettuce (KEEPER) 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. Five 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 with a Lee Spider Spray Trac Tractor 4-row sprayer with three TJ-60 11003VS nozzles per row that delivered a 53 gpa at 30 psi. Insecticide spray treatments were applied on 2 Oct and 16 Oct 2012. An adjuvant, Dyne-Amic (Helena Chemical Co.) was added to each foliar spray mixture at 0.1% vol/vol. Numbers of BAW and CL from 10 random plants per plot in each replicate were recorded on 2 Oct prior to insecticide applications (PT) and on each of the following sampling dates and days after treatment (DAT) indicated: 9 Oct (7DAT1), 16 Oct (14DAT1), 19 Oct (3DAT2), 23 Oct (7DAT2), 26 Oct (10DAT2), 30 Oct (14DAT2), and 5 Nov (20DAT2). 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 population levels were fairly low during this trial, but CL levels were normal for Imperial Valley, CA throughout the trial evaluation period. There were no differences among the treatments on 2 Oct prior to insecticide applications either for BAW or for CL, Table 1 and Table 2. There were no differences among the treatments for mean numbers of BAW on 9 Oct (7DAT1), 16 Oct (14DAT1), 30 Oct (14DAT2), and 5 Nov (20DAT2). All of the insecticide treatments had significantly lower numbers of BAW larvae 19 Oct (3DAT2), 23 Oct (7DAT2) and 26 Oct (10DAT2) compared to the untreated check, but there were no differences among the insecticide treatments for numbers of BAW. The mean for CL larvae for each of the insecticide treatments was significantly lower than the means for the check on all post treatment sampling dates, but there were no differences among the insecticide treatment means for CL (Table 2). There were no visible symptoms of phytotoxicity following any of the insecticide treatments. This research was supported by industry gifts. Table 1. BAW per ten plants 2 Oct 9 Oct 16Oct 19 Oct 23 Oct 26 Oct 30 Oct 5 Nov Treatments oz/acre PT 7DAT1 14DAT1 3DAT2 7DAT2 10DAT2 14DAT2 20DAT2 Belt 480SC 1.5 0.12a 0.00a 0.60a 0.00b 0.00b 0.00b 0.00a 0.02a Radiant SC 5.0 0.28a 0.00a 0.04a 0.00b 0.00b 0.00b 0.00a 0.00a Intrepid 10.0 + 0.18a 0.00a 0.21a 0.00b 0.00b 0.00b 0.02a 0.00a + Warrior 3.0 Entrust SC 5.0 0.22a 0.00a 0.12a 0.00b 0.08b 0.00b 0.00a 0.00a Check --- 0.10a 0.02a 0.26a 0.12a 0.28a 0.06a 0.02a 0.06a Means within columns followed by the same letter are not significantly different, LSD (P>0.05). 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E24 Table 2. CL per ten plants 2 Oct 9 Oct 16Oct 19 Oct 23 Oct 26 Oct 30 Oct 5 Nov Treatments oz/acre PT 7DAT1 14DAT1 3DAT2 7DAT2 10DAT2 14DAT2 20DAT2 Belt 480SC 1.5 0.12a 0.00b 0.24b 0.06b 0.00b 0.00b 0.02b 0.04b Radiant SC 5.0 0.08a 0.00b 0.10b 0.00b 0.02b 0.00b 0.02b 0.02b Intrepid 10.0 + 0.08a 0.00b 0.12b 0.00b 0.00b 0.00b 0.00b 0.00b + Warrior II 3.0 Entrust SC 5.0 0.12a 0.00b 0.08b 0.00b 0.00b 0.00b 0.00b 0.02b Check --- 0.08a 0.32a 0.44a 0.44a 0.25a 0.18a 0.22a 0.32a Means within columns followed by the same letter are not significantly different, LSD (P>0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

INSECTICIDE EFFICACY AGAINST WORM PESTS IN LETTUCE, 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.E24 (E24) LETTUCE (HEAD): Lactuca sativa var. capitata L. ‘KEEPER’ 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): Tricholusia ni (Hübner) The objective of the study was to evaluate the efficacy of various worm control insecticides compared to an untreated check for early season worm pests on iceberg head lettuce under desert growing conditions. Head lettuce (KEEPER) 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. Five 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 with a Lee Spider Spray Trac Tractor 4-row sprayer with three TJ-60 11003VS nozzles per row that delivered a 53 gpa at 30 psi. Insecticide spray treatments were applied on 2 Oct and 16 Oct 2012. An adjuvant, Dyne-Amic (Helena Chemical Co.) was added to each foliar spray mixture at 0.1% vol/vol. Numbers of BAW and CL from 10 random plants per plot in each replicate were recorded on 2 Oct prior to insecticide applications (PT) and on each of the following sampling dates and days after treatment (DAT) indicated: 9 Oct (7DAT1), 16 Oct (14DAT1), 19 Oct (3DAT2), 23 Oct (7DAT2), 26 Oct (10DAT2), 30 Oct (14DAT2), and 5 Nov (20DAT2). 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 population levels were fairly low during this trial, but CL levels were normal for Imperial Valley, CA throughout the trial evaluation period. There were no differences among the treatments on 2 Oct prior to insecticide applications either for BAW or for CL, Table 1 and Table 2. There were no differences among the treatments for mean numbers of BAW on 9 Oct (7DAT1), 16 Oct (14DAT1), 30 Oct (14DAT2), and 5 Nov (20DAT2). All of the insecticide treatments had significantly lower numbers of BAW larvae 19 Oct (3DAT2), 23 Oct (7DAT2) and 26 Oct (10DAT2) compared to the untreated check, but there were no differences among the insecticide treatments for numbers of BAW. The mean for CL larvae for each of the insecticide treatments was significantly lower than the means for the check on all post treatment sampling dates, but there were no differences among the insecticide treatment means for CL (Table 2). There were no visible symptoms of phytotoxicity following any of the insecticide treatments. This research was supported by industry gifts. Table 1. BAW per ten plants 2 Oct 9 Oct 16Oct 19 Oct 23 Oct 26 Oct 30 Oct 5 Nov Treatments oz/acre PT 7DAT1 14DAT1 3DAT2 7DAT2 10DAT2 14DAT2 20DAT2 Belt 480SC 1.5 0.12a 0.00a 0.60a 0.00b 0.00b 0.00b 0.00a 0.02a Radiant SC 5.0 0.28a 0.00a 0.04a 0.00b 0.00b 0.00b 0.00a 0.00a Intrepid 10.0 + 0.18a 0.00a 0.21a 0.00b 0.00b 0.00b 0.02a 0.00a + Warrior 3.0 Entrust SC 5.0 0.22a 0.00a 0.12a 0.00b 0.08b 0.00b 0.00a 0.00a Check --- 0.10a 0.02a 0.26a 0.12a 0.28a 0.06a 0.02a 0.06a Means within columns followed by the same letter are not significantly different, LSD (P>0.05). 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E24 Table 2. CL per ten plants 2 Oct 9 Oct 16Oct 19 Oct 23 Oct 26 Oct 30 Oct 5 Nov Treatments oz/acre PT 7DAT1 14DAT1 3DAT2 7DAT2 10DAT2 14DAT2 20DAT2 Belt 480SC 1.5 0.12a 0.00b 0.24b 0.06b 0.00b 0.00b 0.02b 0.04b Radiant SC 5.0 0.08a 0.00b 0.10b 0.00b 0.02b 0.00b 0.02b 0.02b Intrepid 10.0 + 0.08a 0.00b 0.12b 0.00b 0.00b 0.00b 0.00b 0.00b + Warrior II 3.0 Entrust SC 5.0 0.12a 0.00b 0.08b 0.00b 0.00b 0.00b 0.00b 0.02b Check --- 0.08a 0.32a 0.44a 0.44a 0.25a 0.18a 0.22a 0.32a Means within columns followed by the same letter are not significantly different, LSD (P>0.05).

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2013

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