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Evaluation of Insecticides for the Control of Flea Beetles in Cabbage, 2015 *

Evaluation of Insecticides for the Control of Flea Beetles in Cabbage, 2015... Arthropod Management Tests, 2016, 1–1 doi: 10.1093/amt/tsw013 Section E: Vegetable Crops CABBAGE: Brassica oleracea,L. Evaluation of Insecticides for the Control of Flea Beetles in Cabbage, 2015* James A. C. Mason and Thomas P. Kuhar Department of Entomology, Virginia Tech, 216 Price Hall, Blacksburg, VA 24061-0319, Phone: (540)231-2280 (jmason91@vt.edu; tkuhar@vt.edu) and Corresponding author, e-mail: jmason91@vt.edu Subject Editor: Mark Abney Cabbage (red, white, savoy) | Brassica oleracea var. capitata striped flea beetle | Phyllotreta striolata crucifer flea beetle | Phyllotreta cruciferae The objective of this experiment was to assess the efficacy of insecticides and 5¼>60% defoliation. At harvest, the mean weight of cabbage for control of flea beetles (FB) on cabbage in southwestern Virginia. heads per plot was also assessed to determine whether there was a treat- Six-week old “Bravo” cabbage transplants were planted on bare ment effect on yield. All data were analyzed using ANOVA. Means ground soil on 22 May 2015 at the Virginia Tech Kentland Farm in were separated using Fisher’s LSD at the 0.05 level of significance. Whitethorne, VA. The experiment consisted of eight treatments ar- FB pressure was high, peaking at a mean of 633 beetles per 10 ranged in an RCB design with four replicates. Plots consisted of 7.6-m- plants in some plots. FB species roughly comprised 50% striped long rows spaced 0.9 m apart, and cabbage were planted 38 cm apart FB and 50% crucifer FB. On 9, 13, and 23 Jun, there was a signifi- within rows. Insecticide soil drench treatments were applied at planting cant effect of treatment on numbers of FB per 10 plants. On 11, 18, using a ladle and a bucket method. Foliar spray treatments were applied and 25 Jun and 2 Jul, there was a significant effect of treatment in 1wkafter planting usingaCO powered backpack sprayer that defoliation rating. Among the treatments, Venom 70SG (dinote- sprayed 30 gpa through one hollow cone nozzle per row. furan) applied as a soil drench provided the most effective control, To assess the efficacy of treatments on FBs, the number of beetles having the fewest FB, least defoliation, and the highest crop observed on 10 plants per plot was recorded at least once a week for 4 yield among treatments and the untreated check. Of the foliar appli- wk. Leaf feeding injury was also assessed at least once a week for 4 wk, cations, Brigade (bifenthrin) exhibited control and crop yield using the following percent defoliation scale: 1¼ no damage; 2¼ 1– similar to the Venom 70SG soil drench although it was not as 20% defoliation; 3¼ 21–40% defoliation; 4¼ 41–60% defoliation; effective. Table 1 Treatment Rate amt Application No. of FB per 10 plants Defoliation rating Yield: mean product/acre method fresh weight of cabbage heads (lbs) per plot 5 Jun 9 Jun 13 Jun 23 Jun 11 Jun 18 Jun 25 Jun 2 Jul 27 Jul Untreated check — — 16.3 a 35.0 a 374.0 b 310.3 bc 1.8 a 3.1 a 3.1 a 2.7 a 23.0 d Admire Pro 4.6SC 7.3 fl oz Posttransplant soil drench 0.5 b 33.8 a 458.5 ab 423.0 ab 1.4 bc 2.5 bc 2.8 a 2.3 ab 33.5 cd Venom 70SG 6.0 fl oz Posttransplant soil drench 1.5 b 0.3 d 11.3 c 146.8 d 1.1 d 1.0 d 1.1 c 1.3 d 58.5 a Verimark 1.67SC 6.75 fl oz Posttransplant soil drench 2.0 b 13.0 bcd 558.0 ab 482.5 a 1.2 cd 2.1 c 2.0 b 1.8 bc 40.8 bc Admire Pro 4.6SC 1.3 fl oz Foliar spray 0.8 b 19.3 ab 375.3 ab 394.5 ab 1.5 ab 2.7 ab 2.8 a 2.3 ab 29.3 cd Venom 70SG 1.0 fl oz Foliar spray 1.0 b 9.8 bcd 633.0 a 402.5 ab 1.4 bc 2.4 bc 2.9 a 2.2 ab 27.5 cd Exirel 0.83SOE 13.5 oz Foliar spray 0.0 b 17.8 abc 346.0 b 388.3 ab 1.5 ab 2.4 bc 2.7 a 2.0 b 32.0 cd Brigade 2.1 fl oz Foliar spray 2.0 b 1.0 cd 28.5 c 201.5 cd 1.1 d 1.0 d 1.1 c 1.5 cd 54.3 ab All data were analyzed using ANOVA. Means were separated using Fisher’s LSD at the 0.05 level of significance. Means followed by the same letter within a column are not significantly different (P> 0.05). * This research was conducted with products donated by Bayer Cropscience, Dupont Crop Protection, FMC Corp., and Valent USA. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Evaluation of Insecticides for the Control of Flea Beetles in Cabbage, 2015 *

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© The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America.
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Abstract

Arthropod Management Tests, 2016, 1–1 doi: 10.1093/amt/tsw013 Section E: Vegetable Crops CABBAGE: Brassica oleracea,L. Evaluation of Insecticides for the Control of Flea Beetles in Cabbage, 2015* James A. C. Mason and Thomas P. Kuhar Department of Entomology, Virginia Tech, 216 Price Hall, Blacksburg, VA 24061-0319, Phone: (540)231-2280 (jmason91@vt.edu; tkuhar@vt.edu) and Corresponding author, e-mail: jmason91@vt.edu Subject Editor: Mark Abney Cabbage (red, white, savoy) | Brassica oleracea var. capitata striped flea beetle | Phyllotreta striolata crucifer flea beetle | Phyllotreta cruciferae The objective of this experiment was to assess the efficacy of insecticides and 5¼>60% defoliation. At harvest, the mean weight of cabbage for control of flea beetles (FB) on cabbage in southwestern Virginia. heads per plot was also assessed to determine whether there was a treat- Six-week old “Bravo” cabbage transplants were planted on bare ment effect on yield. All data were analyzed using ANOVA. Means ground soil on 22 May 2015 at the Virginia Tech Kentland Farm in were separated using Fisher’s LSD at the 0.05 level of significance. Whitethorne, VA. The experiment consisted of eight treatments ar- FB pressure was high, peaking at a mean of 633 beetles per 10 ranged in an RCB design with four replicates. Plots consisted of 7.6-m- plants in some plots. FB species roughly comprised 50% striped long rows spaced 0.9 m apart, and cabbage were planted 38 cm apart FB and 50% crucifer FB. On 9, 13, and 23 Jun, there was a signifi- within rows. Insecticide soil drench treatments were applied at planting cant effect of treatment on numbers of FB per 10 plants. On 11, 18, using a ladle and a bucket method. Foliar spray treatments were applied and 25 Jun and 2 Jul, there was a significant effect of treatment in 1wkafter planting usingaCO powered backpack sprayer that defoliation rating. Among the treatments, Venom 70SG (dinote- sprayed 30 gpa through one hollow cone nozzle per row. furan) applied as a soil drench provided the most effective control, To assess the efficacy of treatments on FBs, the number of beetles having the fewest FB, least defoliation, and the highest crop observed on 10 plants per plot was recorded at least once a week for 4 yield among treatments and the untreated check. Of the foliar appli- wk. Leaf feeding injury was also assessed at least once a week for 4 wk, cations, Brigade (bifenthrin) exhibited control and crop yield using the following percent defoliation scale: 1¼ no damage; 2¼ 1– similar to the Venom 70SG soil drench although it was not as 20% defoliation; 3¼ 21–40% defoliation; 4¼ 41–60% defoliation; effective. Table 1 Treatment Rate amt Application No. of FB per 10 plants Defoliation rating Yield: mean product/acre method fresh weight of cabbage heads (lbs) per plot 5 Jun 9 Jun 13 Jun 23 Jun 11 Jun 18 Jun 25 Jun 2 Jul 27 Jul Untreated check — — 16.3 a 35.0 a 374.0 b 310.3 bc 1.8 a 3.1 a 3.1 a 2.7 a 23.0 d Admire Pro 4.6SC 7.3 fl oz Posttransplant soil drench 0.5 b 33.8 a 458.5 ab 423.0 ab 1.4 bc 2.5 bc 2.8 a 2.3 ab 33.5 cd Venom 70SG 6.0 fl oz Posttransplant soil drench 1.5 b 0.3 d 11.3 c 146.8 d 1.1 d 1.0 d 1.1 c 1.3 d 58.5 a Verimark 1.67SC 6.75 fl oz Posttransplant soil drench 2.0 b 13.0 bcd 558.0 ab 482.5 a 1.2 cd 2.1 c 2.0 b 1.8 bc 40.8 bc Admire Pro 4.6SC 1.3 fl oz Foliar spray 0.8 b 19.3 ab 375.3 ab 394.5 ab 1.5 ab 2.7 ab 2.8 a 2.3 ab 29.3 cd Venom 70SG 1.0 fl oz Foliar spray 1.0 b 9.8 bcd 633.0 a 402.5 ab 1.4 bc 2.4 bc 2.9 a 2.2 ab 27.5 cd Exirel 0.83SOE 13.5 oz Foliar spray 0.0 b 17.8 abc 346.0 b 388.3 ab 1.5 ab 2.4 bc 2.7 a 2.0 b 32.0 cd Brigade 2.1 fl oz Foliar spray 2.0 b 1.0 cd 28.5 c 201.5 cd 1.1 d 1.0 d 1.1 c 1.5 cd 54.3 ab All data were analyzed using ANOVA. Means were separated using Fisher’s LSD at the 0.05 level of significance. Means followed by the same letter within a column are not significantly different (P> 0.05). * This research was conducted with products donated by Bayer Cropscience, Dupont Crop Protection, FMC Corp., and Valent USA. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2016

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