Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

EVALUATION OF SOIL INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN CABBAGE IN VIRGINIA, 2009

EVALUATION OF SOIL INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN CABBAGE IN VIRGINIA, 2009 Arthropod Management Tests 2010, Vol. 35 doi: 10.4182/amt.2010.E3 E3 CABBAGE: Brassica Oleracea, ‘Late flat dutch’ EVALUATION OF SOIL INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN CABBAGE IN VIRGINIA, Thomas P. Kuhar Department of Entomology Virginia Tech Eastern Shore Agricultural Research & Extension Center 33446 Research Drive Painter, VA 23420 Phone: (757) 414-0724 ext. 14 E-mail: tkuhar@vt.edu Hélène Doughty Cabbage Webworm (CWW): Hellula rogatalis (Hulst) Green peach aphids (GPA): Myzus persicae The objective of this experiment was to assess the efficacy of various soil insecticides to control lepidopteran larvae and green peach aphids in cabbage. The trial consisted of 6 treatments arranged in a RCB design with four replicates. Cabbage plants were transplanted 12 inches (0.23 m) apart on 3 Sep at the Virginia Tech Eastern Shore AREC near Painter, VA. Plots were 1 row wide and 20 ft (6.1 m) long. Rows were planted on a 3 ft row center (0.9 m) in a 6 tier field design with 8 ft (2.4 m) alleys between tiers and a 16 ft (4.8 m) center alley. All plots were maintained according to standard commercial practices. Soil treatments were applied on 3 Sep using a one-nozzle boom without spray tip, directed at the base of each plant. The boom was powered by a CO backpack sprayer at 40 psi delivering 125 ml of water per plant. On 6 Oct (33 DAT) and 14 Oct (41 DAT), the number of GPA was recorded per 20 leaves. On 6 Oct (33 DAT) and 14 Oct (41 DAT), the number of CWW infested plants was also recorded per plot. All data were analyzed using ANOVA. Proportion data were arcsine square root transformed prior to analysis. Means were separated using Fisher’s Protected LSD at the 0.05 level of significance. Cabbage plots were subject to standing water for a period of 4-5 days following rains that occurred from Sep 7 to 11 (soon after transplanting and applying the drench treatments). These conditions may have impacted the leaching and efficacy of the soil insecticides. At 33 DAT, all insecticide treatments except the lowest rate of HGW86 provided significant control of GPA. Durivo provided the best control of aphids. At 41 DAT, only Durivo and the highest rate of HGW86 had significantly fewer GPA than the untreated check. CWW pressure was moderately high with 26.8% and 24.3% infested plants in the untreated control plots on each sample date, respectively. All treatments except Venom significantly controlled CWW. No signs of phytotoxicity were observed. Table 1. % CWW infested plants Mean no. GPA 6-Oct 14-Oct 6 Oct / 20 14 Oct / 10 leaves leaves Treatment Rate / acre (33 DAT) (41 DAT) (33 DAT) (41 DAT) Untreated Control 26.8a 24.3a 63.3a 50.3a HGW86 20SC 6.75 fl oz 1.6bc 0.0c 35.3ab 38.0ab HGW86 20SC 13.5 fl oz 2.5bc 3.4bc 27.3bc 38.3ab HGW86 20SC 20.25 fl oz 3.1bc 4.7bc 18.8bc 16.5bc Venom 5.6 oz 10.4b 15.5ab 21.3bc 21.5abc Durivo 12 fl oz 0.0c 2.4bc 1.3c 3.5c P-Value from ANOVA 0.0038 0.0106 0.0247 0.059 All data were analyzed using analysis of variance procedures. 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). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF SOIL INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN CABBAGE IN VIRGINIA, 2009

Loading next page...
 
/lp/oxford-university-press/evaluation-of-soil-insecticides-for-the-control-of-foliar-insects-in-2fBLSLqQ7R

References (0)

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.4182/amt.2010.E3
Publisher site
See Article on Publisher Site

Abstract

Arthropod Management Tests 2010, Vol. 35 doi: 10.4182/amt.2010.E3 E3 CABBAGE: Brassica Oleracea, ‘Late flat dutch’ EVALUATION OF SOIL INSECTICIDES FOR THE CONTROL OF FOLIAR INSECTS IN CABBAGE IN VIRGINIA, Thomas P. Kuhar Department of Entomology Virginia Tech Eastern Shore Agricultural Research & Extension Center 33446 Research Drive Painter, VA 23420 Phone: (757) 414-0724 ext. 14 E-mail: tkuhar@vt.edu Hélène Doughty Cabbage Webworm (CWW): Hellula rogatalis (Hulst) Green peach aphids (GPA): Myzus persicae The objective of this experiment was to assess the efficacy of various soil insecticides to control lepidopteran larvae and green peach aphids in cabbage. The trial consisted of 6 treatments arranged in a RCB design with four replicates. Cabbage plants were transplanted 12 inches (0.23 m) apart on 3 Sep at the Virginia Tech Eastern Shore AREC near Painter, VA. Plots were 1 row wide and 20 ft (6.1 m) long. Rows were planted on a 3 ft row center (0.9 m) in a 6 tier field design with 8 ft (2.4 m) alleys between tiers and a 16 ft (4.8 m) center alley. All plots were maintained according to standard commercial practices. Soil treatments were applied on 3 Sep using a one-nozzle boom without spray tip, directed at the base of each plant. The boom was powered by a CO backpack sprayer at 40 psi delivering 125 ml of water per plant. On 6 Oct (33 DAT) and 14 Oct (41 DAT), the number of GPA was recorded per 20 leaves. On 6 Oct (33 DAT) and 14 Oct (41 DAT), the number of CWW infested plants was also recorded per plot. All data were analyzed using ANOVA. Proportion data were arcsine square root transformed prior to analysis. Means were separated using Fisher’s Protected LSD at the 0.05 level of significance. Cabbage plots were subject to standing water for a period of 4-5 days following rains that occurred from Sep 7 to 11 (soon after transplanting and applying the drench treatments). These conditions may have impacted the leaching and efficacy of the soil insecticides. At 33 DAT, all insecticide treatments except the lowest rate of HGW86 provided significant control of GPA. Durivo provided the best control of aphids. At 41 DAT, only Durivo and the highest rate of HGW86 had significantly fewer GPA than the untreated check. CWW pressure was moderately high with 26.8% and 24.3% infested plants in the untreated control plots on each sample date, respectively. All treatments except Venom significantly controlled CWW. No signs of phytotoxicity were observed. Table 1. % CWW infested plants Mean no. GPA 6-Oct 14-Oct 6 Oct / 20 14 Oct / 10 leaves leaves Treatment Rate / acre (33 DAT) (41 DAT) (33 DAT) (41 DAT) Untreated Control 26.8a 24.3a 63.3a 50.3a HGW86 20SC 6.75 fl oz 1.6bc 0.0c 35.3ab 38.0ab HGW86 20SC 13.5 fl oz 2.5bc 3.4bc 27.3bc 38.3ab HGW86 20SC 20.25 fl oz 3.1bc 4.7bc 18.8bc 16.5bc Venom 5.6 oz 10.4b 15.5ab 21.3bc 21.5abc Durivo 12 fl oz 0.0c 2.4bc 1.3c 3.5c P-Value from ANOVA 0.0038 0.0106 0.0247 0.059 All data were analyzed using analysis of variance procedures. 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).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2010

There are no references for this article.