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EFFICACY OF GWN-1718 AS A COMPANION PESTICIDE WITH HEXYGON OR MESUROL FOR CONTROL OF MELON APHID ON GREENHOUSE GROWN CHRYSANTHEMUMS, EXPERIMENT 1, 2006

EFFICACY OF GWN-1718 AS A COMPANION PESTICIDE WITH HEXYGON OR MESUROL FOR CONTROL OF MELON APHID... (G36) CHRYSANTHEMUM: Chrysanthemum x morifolium Ramat, ‘Charm’ EFFICACY OF GWN-1718 AS A COMPANION PESTICIDE WITH HEXYGON OR MESUROL FOR CONTROL OF MELON APHID ON GREENHOUSE GROWN CHRYSANTHEMUMS, EXPERIMENT 1, 2006 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 E-mail: jfprice@.ufl.edu Curtis A. Nagle E-mail: cnagle@ufl.edu Melon aphid: Aphis gossypii (Glover) The efficacy of GWN-1718 as a companion pesticide for control of melon aphid on potted, greenhouse grown, chrysanthemum was evaluated at the Gulf Coast Research and Education Center, Wimauma, FL. during the summer of 2006. Rooted cuttings of ‘Charm’ chrysanthemum were planted one each per 1 gal pot and established RCB design with a factorial arrangement in six replications with two plants per plot on 13 May. The plants were pinched to four nodes on 24 May and about 50 aphids from a laboratory colony were introduced to each plant on 7 Jun. Pre-treatment samples were taken on 13 Jun. There were three levels of primary pesticide (factor A, Table 1): No pesticide, Hexygon, and Mesurol and two levels of companion pesticide (factor B, Table 2): With and without GWN-1718. Treatments were applied on 14 Jun and 29 Jun using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45-degree core and a no. 4 disc, pressurized by CO to 40 psi, and calibrated to treat 1000 plants per 5.87 gal of spray mixture. Sampling was performed weekly by searching the leaves and counting aphids, with the aid of a 5x hand lens, for 2 min per plot (1 min per plant). Numbers of live aphids (juveniles, winged and non-winged adults) were recorded in a single category. Data were transformed log (x + 1) prior to ANOVA and means were separated by Fisher’s Protected LSD (P = 0.05). Non- transformed means are reported. There were no significant differences among aphid densities in any of the plots prior to treatment application. No primary pesticide x companion pesticide interaction was detected 6 days or 12 days after the first application of treatments (20 Jun and 26 Jun), or on 3 Jul, 4 days after the second application of treatments. At those times the lowest densities of aphids occurred in plots treated with the primary pesticide Mesurol (Table 1). On 26 Jun and 3 Jul lowest densities of aphids occurred in plots treated with the companion pesticide GWN-1718 (Table 2). On the remainder of the sample dates there were primary pesticide x companion pesticide interactions (Table 3). Eleven days after the second application of treatments (10 Jul) the lowest densities of aphids occurred in plots treated with Mesurol with or without GWN-1718. At that time there were no significant differences between aphid densities in the untreated checks and in plots treated with Hexygon alone. On 25 Jul the lowest densities of aphids occurred in plots treated with GWN-1718 with or without Hexygon and in plots treated with Mesurol with or without GWN-1718 (Table 3). No phytotoxicity was observed on plants in any of the plots. Table 1. Melon aphid/2 min of searching Treatment / Rate formulation amt/100 gal 13 Jun 20 Jun 26 Jun 3 Jul Untreated check --- 29.6a 29.3a 21.4ab 23.8a Hexygon 50DF 2.0 oz 24.6a 28.2a 32.3a 41.8a Mesurol 75W 16.0 oz 28.8a 15.3b 11.8b 0.9b Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P = 0.05). Data were transformed log (x + 1) prior to analysis; non-transformed means are presented. All treatments contain six replicates with GWN-1718 75 WP (factor B) applied at 6 oz. per 100 gal and six replicates with no application of GWN-1718 75 WP. Applied at the rate of 5.87 gal per 1000 plants. Table 2. Melon aphid/2 min of searching Treatment / Rate formulation amt/100 gal 13 Jun 20 Jun 26 Jun 3 Jul Untreated check --- 27.0a 27.1a 29.6a 29.6a GWN-1718 75 WP 6.0 oz 28.3a 21.3a 14.0b 14.8b Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P = 0.05). Data were transformed log (x + 1) prior to analysis; non-transformed means are presented. All treatments contain six replicates of each of the following: No treatment, Hexygon 50 DF applied at 2 oz. per 100 gal, or Mesurol 75 W applied at 16 oz. per 100 gal (factor A). Applied at the rate of 5.87 gal per 1000 plants. Table 3. Melon aphid/2 min of searching Treatment / Rate formulation amt/100 gal 10 Jul 19 Jul 25 Jul Untreated check --- 56.0ab 102.0a 111.2a GWN-1718 75 WP 6.0 oz 11.7c 21.2b 34.2b Hexygon 50 DF 2.0 oz 64.0a 132.2a 156.5a Hexygon 50 DF 2.0 oz 29.5bc 40.7b 39.7b + GWN-1718 75 WP + 6.0 oz Mesurol 75 W 16.0 oz 0.8d 5.0c 17.8b Mesurol 75 W 16.0 oz 1.3d 10.0c 28.2b + GWN-1718 75 WP + 6.0 oz Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P = 0.05). Data were transformed log (x + 1) prior to analysis; non-transformed means are presented. A + indicates the products were combined. Applied at the rate of 5.87 gal per 1000 plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF GWN-1718 AS A COMPANION PESTICIDE WITH HEXYGON OR MESUROL FOR CONTROL OF MELON APHID ON GREENHOUSE GROWN CHRYSANTHEMUMS, EXPERIMENT 1, 2006

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
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10.1093/amt/33.1.G36
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Abstract

(G36) CHRYSANTHEMUM: Chrysanthemum x morifolium Ramat, ‘Charm’ EFFICACY OF GWN-1718 AS A COMPANION PESTICIDE WITH HEXYGON OR MESUROL FOR CONTROL OF MELON APHID ON GREENHOUSE GROWN CHRYSANTHEMUMS, EXPERIMENT 1, 2006 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 E-mail: jfprice@.ufl.edu Curtis A. Nagle E-mail: cnagle@ufl.edu Melon aphid: Aphis gossypii (Glover) The efficacy of GWN-1718 as a companion pesticide for control of melon aphid on potted, greenhouse grown, chrysanthemum was evaluated at the Gulf Coast Research and Education Center, Wimauma, FL. during the summer of 2006. Rooted cuttings of ‘Charm’ chrysanthemum were planted one each per 1 gal pot and established RCB design with a factorial arrangement in six replications with two plants per plot on 13 May. The plants were pinched to four nodes on 24 May and about 50 aphids from a laboratory colony were introduced to each plant on 7 Jun. Pre-treatment samples were taken on 13 Jun. There were three levels of primary pesticide (factor A, Table 1): No pesticide, Hexygon, and Mesurol and two levels of companion pesticide (factor B, Table 2): With and without GWN-1718. Treatments were applied on 14 Jun and 29 Jun using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45-degree core and a no. 4 disc, pressurized by CO to 40 psi, and calibrated to treat 1000 plants per 5.87 gal of spray mixture. Sampling was performed weekly by searching the leaves and counting aphids, with the aid of a 5x hand lens, for 2 min per plot (1 min per plant). Numbers of live aphids (juveniles, winged and non-winged adults) were recorded in a single category. Data were transformed log (x + 1) prior to ANOVA and means were separated by Fisher’s Protected LSD (P = 0.05). Non- transformed means are reported. There were no significant differences among aphid densities in any of the plots prior to treatment application. No primary pesticide x companion pesticide interaction was detected 6 days or 12 days after the first application of treatments (20 Jun and 26 Jun), or on 3 Jul, 4 days after the second application of treatments. At those times the lowest densities of aphids occurred in plots treated with the primary pesticide Mesurol (Table 1). On 26 Jun and 3 Jul lowest densities of aphids occurred in plots treated with the companion pesticide GWN-1718 (Table 2). On the remainder of the sample dates there were primary pesticide x companion pesticide interactions (Table 3). Eleven days after the second application of treatments (10 Jul) the lowest densities of aphids occurred in plots treated with Mesurol with or without GWN-1718. At that time there were no significant differences between aphid densities in the untreated checks and in plots treated with Hexygon alone. On 25 Jul the lowest densities of aphids occurred in plots treated with GWN-1718 with or without Hexygon and in plots treated with Mesurol with or without GWN-1718 (Table 3). No phytotoxicity was observed on plants in any of the plots. Table 1. Melon aphid/2 min of searching Treatment / Rate formulation amt/100 gal 13 Jun 20 Jun 26 Jun 3 Jul Untreated check --- 29.6a 29.3a 21.4ab 23.8a Hexygon 50DF 2.0 oz 24.6a 28.2a 32.3a 41.8a Mesurol 75W 16.0 oz 28.8a 15.3b 11.8b 0.9b Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P = 0.05). Data were transformed log (x + 1) prior to analysis; non-transformed means are presented. All treatments contain six replicates with GWN-1718 75 WP (factor B) applied at 6 oz. per 100 gal and six replicates with no application of GWN-1718 75 WP. Applied at the rate of 5.87 gal per 1000 plants. Table 2. Melon aphid/2 min of searching Treatment / Rate formulation amt/100 gal 13 Jun 20 Jun 26 Jun 3 Jul Untreated check --- 27.0a 27.1a 29.6a 29.6a GWN-1718 75 WP 6.0 oz 28.3a 21.3a 14.0b 14.8b Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P = 0.05). Data were transformed log (x + 1) prior to analysis; non-transformed means are presented. All treatments contain six replicates of each of the following: No treatment, Hexygon 50 DF applied at 2 oz. per 100 gal, or Mesurol 75 W applied at 16 oz. per 100 gal (factor A). Applied at the rate of 5.87 gal per 1000 plants. Table 3. Melon aphid/2 min of searching Treatment / Rate formulation amt/100 gal 10 Jul 19 Jul 25 Jul Untreated check --- 56.0ab 102.0a 111.2a GWN-1718 75 WP 6.0 oz 11.7c 21.2b 34.2b Hexygon 50 DF 2.0 oz 64.0a 132.2a 156.5a Hexygon 50 DF 2.0 oz 29.5bc 40.7b 39.7b + GWN-1718 75 WP + 6.0 oz Mesurol 75 W 16.0 oz 0.8d 5.0c 17.8b Mesurol 75 W 16.0 oz 1.3d 10.0c 28.2b + GWN-1718 75 WP + 6.0 oz Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P = 0.05). Data were transformed log (x + 1) prior to analysis; non-transformed means are presented. A + indicates the products were combined. Applied at the rate of 5.87 gal per 1000 plants.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2008

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