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

Learn More →

FOLIAR APPLIED INSECTICIDES FOR CONTROL OF MELON APHID IN STRAWBERRY, 2011

FOLIAR APPLIED INSECTICIDES FOR CONTROL OF MELON APHID IN STRAWBERRY, 2011 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.C24 (C24) STRAWBERRY: Fragaria × ananassa Duchesne, ‘Strawberry Festival’ James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 14625 CR 672 Wimauma, FL 33598 Phone: (813) 633-4123 Fax: (813) 634-0001 Email: jfprice@ufl.edu Curtis A. Nagle Email: cnagle@ufl.edu Melon aphid (MA): Aphis gossypii Glover The efficacies of four foliar applied insecticides were evaluated compared to a non-treated check for MA control in strawberry at the Gulf Coast Research and Education Center, Wimauma, Fla. late in the season of 2010-11. ‘Strawberry Festival’ transplants were set in the field in mid-Oct 2010 in plastic mulched beds, 13 inches high and 27 inches across the top, and with 4-ft bed spacing. Overhead irrigation was applied for 10 days after setting to aid in transplant establishment. Trickle irrigation was used for the remainder of the experiment. Plots were 12.5 ft long and consisted of 20 plants in two ten-plant rows per bed. MA populations developed naturally in late Mar. Treatments were replicated four times in a RCB design. Treatments were applied on 24 Mar using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45-degree core and a number four disc. The sprayer was pressurized by CO to 40 psi and calibrated to deliver 100 gpa. Pre-treatment samples were taken on 22 Mar and sampling continued weekly through 6 Apr. Sampling consisted of searching strawberry leaves for 5 min per plot with the aid of a 5x hand lens. Numbers of live aphids (juveniles, winged and non-winged adults) were recorded in a single category. Data were transformed using √(x+0.5) prior to ANOVA and means were separated by Fisher’s Protected LSD test (P≤0.05). Means were reported in the original scale. Average MA densities ranged from 5.8 to 25.8 per 5 min 2 days prior to treatment applications and there were no significant differences among treatments. Six and 13 days after treatment applications (30 Mar and 6 Apr), lowest densities of MA occurred in all chemically treated plots (Table 1). On 6 Apr there were no aphids found among any of the chemical treatments. No phytotoxicity was observed. This research was supported by industry gift(s) of pesticides and/or research funding. TABLE 1. No. melon aphids/5 min of observation Treatment/ Rate Formulation amt/acre 22 Mar 30 Mar 6 Apr Non-treated -- 15.0a 11.0a 7.0a Assail 30SG 4 oz. 16.5a 0.0b 0.0b Movento 2SC + NIS 5 fl. oz. 5.8a 1.3b 0.0b Movento 2SC + NIS 8 fl. oz. 14.3a 0.3b 0.0b NAI-2302 15% EC + NIS 21 fl. oz. 25.8a 2.8b 0.0b NNI-0101 20% SC + NIS 3.2 oz. 13.5a 0.0b 0.0b F 0.42 5.20 3.22 5,15 P-value 0.8253 0.0057 0.0358 Data were transformed √(x+0.5) prior to ANOVA; non-transformed means are reported. Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P≤0.05). A ‘+’ sign indicates the products were combined; all treatments were applied on 24 Mar. b ® NIS non-ionic surfactant, Induce , applied at 32 fl. oz./acre. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

FOLIAR APPLIED INSECTICIDES FOR CONTROL OF MELON APHID IN STRAWBERRY, 2011

Loading next page...
 
/lp/oxford-university-press/foliar-applied-insecticides-for-control-of-melon-aphid-in-strawberry-91FJ2QnqMk
Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.4182/amt.2012.C24
Publisher site
See Article on Publisher Site

Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.C24 (C24) STRAWBERRY: Fragaria × ananassa Duchesne, ‘Strawberry Festival’ James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 14625 CR 672 Wimauma, FL 33598 Phone: (813) 633-4123 Fax: (813) 634-0001 Email: jfprice@ufl.edu Curtis A. Nagle Email: cnagle@ufl.edu Melon aphid (MA): Aphis gossypii Glover The efficacies of four foliar applied insecticides were evaluated compared to a non-treated check for MA control in strawberry at the Gulf Coast Research and Education Center, Wimauma, Fla. late in the season of 2010-11. ‘Strawberry Festival’ transplants were set in the field in mid-Oct 2010 in plastic mulched beds, 13 inches high and 27 inches across the top, and with 4-ft bed spacing. Overhead irrigation was applied for 10 days after setting to aid in transplant establishment. Trickle irrigation was used for the remainder of the experiment. Plots were 12.5 ft long and consisted of 20 plants in two ten-plant rows per bed. MA populations developed naturally in late Mar. Treatments were replicated four times in a RCB design. Treatments were applied on 24 Mar using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45-degree core and a number four disc. The sprayer was pressurized by CO to 40 psi and calibrated to deliver 100 gpa. Pre-treatment samples were taken on 22 Mar and sampling continued weekly through 6 Apr. Sampling consisted of searching strawberry leaves for 5 min per plot with the aid of a 5x hand lens. Numbers of live aphids (juveniles, winged and non-winged adults) were recorded in a single category. Data were transformed using √(x+0.5) prior to ANOVA and means were separated by Fisher’s Protected LSD test (P≤0.05). Means were reported in the original scale. Average MA densities ranged from 5.8 to 25.8 per 5 min 2 days prior to treatment applications and there were no significant differences among treatments. Six and 13 days after treatment applications (30 Mar and 6 Apr), lowest densities of MA occurred in all chemically treated plots (Table 1). On 6 Apr there were no aphids found among any of the chemical treatments. No phytotoxicity was observed. This research was supported by industry gift(s) of pesticides and/or research funding. TABLE 1. No. melon aphids/5 min of observation Treatment/ Rate Formulation amt/acre 22 Mar 30 Mar 6 Apr Non-treated -- 15.0a 11.0a 7.0a Assail 30SG 4 oz. 16.5a 0.0b 0.0b Movento 2SC + NIS 5 fl. oz. 5.8a 1.3b 0.0b Movento 2SC + NIS 8 fl. oz. 14.3a 0.3b 0.0b NAI-2302 15% EC + NIS 21 fl. oz. 25.8a 2.8b 0.0b NNI-0101 20% SC + NIS 3.2 oz. 13.5a 0.0b 0.0b F 0.42 5.20 3.22 5,15 P-value 0.8253 0.0057 0.0358 Data were transformed √(x+0.5) prior to ANOVA; non-transformed means are reported. Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P≤0.05). A ‘+’ sign indicates the products were combined; all treatments were applied on 24 Mar. b ® NIS non-ionic surfactant, Induce , applied at 32 fl. oz./acre.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

There are no references for this article.