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EFFECT OF THE RESIDUAL OF SELECTED INSECTICIDES AGAINST ADULT SHARPSHOOTERS, SUMMER 2004

EFFECT OF THE RESIDUAL OF SELECTED INSECTICIDES AGAINST ADULT SHARPSHOOTERS, SUMMER 2004 (G26) CHRYSANTHEMUM: Chrysanthemum x morifolium Ramat, ‘White Diamond’ EFFECT OF THE RESIDUAL OF SELECTED INSECTICIDES AGAINST ADULT SHARPSHOOTERS, SUMMER 2004 James A. Bethke Department of Entomology University of California Riverside, CA 92521 Phone: (909) 787-4733 Fax: (909) 787-3086 E-mail: bethke@citrus.ucr.edu Oliver F. Z. Siapno E-mail: richard.redak@ucr.edu Richard A. Redak E-mail: richard.redak@ucr.edu Glassy-winged sharpshooter (GWS): Homalodisca coagulata (Say) The efficacy of selected pesticides for control of GWS adults were compared with a water check in the summer of 2004 on potted chrysanthemum plants in greenhouses at the University of California Riverside campus. Plants were potted in 15 cm pots, placed on raised greenhouse benches, fertilized once with approximately 7 g of Osmocote (14-14-14), and irrigated every other day. Treatments (Table 1) were applied to runoff on 14 Jul 2004 using a backpack sprayer with a standard flat fan nozzle at 30-40 psi. Cages (40-cm diameter × 70-cm high) were placed over the plants after treatment applications had air- dried. Cages consisted of an acetate cylinder covered with screening material (32 × 32, product no. 5006104, Chicopee Lumite, Gainesville, GA, USA) glued to the top of the cylinder for ventilation. A RCB design was used with five single-plant replicates per treatment. GWS adults were collected from citrus at the University of California Agricultural Operations, Riverside. Ten adults were released in each cage covering the treated chrysanthemum 1 DAT and mortality was observed in 24 h. Additional groups of field collected GWS were released onto each plant 7, 14 and 21 DAT, and mortality was again assessed in 24 h for each group. Those products that did not cause greater than 50% mortality 14 DAT were removed from the last assessment. Data were transformed arcsine √x and analyzed using ANOVA. Fishers protected LSD was used to separate means following a significant F test (P ≤ 0.05). No phytotoxicity was observed in any treatment during the length of the trial. Azatin 4.5 WP was removed from the trial 14 DAT because it did not cause greater than 50% mortality at either rate. Residuals of DeltaGard SC, Tempo WP, and Tempo Ultra WP caused 100% mortality of GWS adults during all four assessments. The carbamates Mesurol and Sevin caused 100% mortality of GWS up until 14 DAT and 21 DAT respectively. Thereafter, efficacy declined rapidly. Mean percent mortality Treatment/ Rate formulation amt/100 gal 1 DAT 7 DAT 14 DAT 21 DAT Untreated check --- 2.0c 6.0b 2.0d 0.0d Azatin 4.5WP 8.0 oz 8.0b 8.0b 2.0d --- Azatin 4.5WP 10.0 oz 2.0c 12.0b 8.0c --- DeltaGard GC 5SC 8.0 fl oz 100.0a 100.0a 100.0a 100.0a Mesurol 75W 0.5 oz 100.0a 100.0a 54.0b 32.0c Sevin SL 30.0 fl oz 100.0a 100.0a 100.0a 68.0b Tempo 20WP 6.7 oz 100.0a 100.0a 100.0a 100.0a Tempo Ultra 1SC 5.4 fl oz 100.0a 100.0a 100.0a 100.0a Means within a column followed by a different letter are significantly different (P < 0.05, Fisher’s Protected LSD). Data were transformed arcsine√x prior to analysis; non-transformed data are presented. Products that did not cause more then 50% mortality 14 DAT were removed from further assessment. A separate set of insects was assessed on all three dates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFECT OF THE RESIDUAL OF SELECTED INSECTICIDES AGAINST ADULT SHARPSHOOTERS, SUMMER 2004

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10.1093/amt/30.1.G26
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Abstract

(G26) CHRYSANTHEMUM: Chrysanthemum x morifolium Ramat, ‘White Diamond’ EFFECT OF THE RESIDUAL OF SELECTED INSECTICIDES AGAINST ADULT SHARPSHOOTERS, SUMMER 2004 James A. Bethke Department of Entomology University of California Riverside, CA 92521 Phone: (909) 787-4733 Fax: (909) 787-3086 E-mail: bethke@citrus.ucr.edu Oliver F. Z. Siapno E-mail: richard.redak@ucr.edu Richard A. Redak E-mail: richard.redak@ucr.edu Glassy-winged sharpshooter (GWS): Homalodisca coagulata (Say) The efficacy of selected pesticides for control of GWS adults were compared with a water check in the summer of 2004 on potted chrysanthemum plants in greenhouses at the University of California Riverside campus. Plants were potted in 15 cm pots, placed on raised greenhouse benches, fertilized once with approximately 7 g of Osmocote (14-14-14), and irrigated every other day. Treatments (Table 1) were applied to runoff on 14 Jul 2004 using a backpack sprayer with a standard flat fan nozzle at 30-40 psi. Cages (40-cm diameter × 70-cm high) were placed over the plants after treatment applications had air- dried. Cages consisted of an acetate cylinder covered with screening material (32 × 32, product no. 5006104, Chicopee Lumite, Gainesville, GA, USA) glued to the top of the cylinder for ventilation. A RCB design was used with five single-plant replicates per treatment. GWS adults were collected from citrus at the University of California Agricultural Operations, Riverside. Ten adults were released in each cage covering the treated chrysanthemum 1 DAT and mortality was observed in 24 h. Additional groups of field collected GWS were released onto each plant 7, 14 and 21 DAT, and mortality was again assessed in 24 h for each group. Those products that did not cause greater than 50% mortality 14 DAT were removed from the last assessment. Data were transformed arcsine √x and analyzed using ANOVA. Fishers protected LSD was used to separate means following a significant F test (P ≤ 0.05). No phytotoxicity was observed in any treatment during the length of the trial. Azatin 4.5 WP was removed from the trial 14 DAT because it did not cause greater than 50% mortality at either rate. Residuals of DeltaGard SC, Tempo WP, and Tempo Ultra WP caused 100% mortality of GWS adults during all four assessments. The carbamates Mesurol and Sevin caused 100% mortality of GWS up until 14 DAT and 21 DAT respectively. Thereafter, efficacy declined rapidly. Mean percent mortality Treatment/ Rate formulation amt/100 gal 1 DAT 7 DAT 14 DAT 21 DAT Untreated check --- 2.0c 6.0b 2.0d 0.0d Azatin 4.5WP 8.0 oz 8.0b 8.0b 2.0d --- Azatin 4.5WP 10.0 oz 2.0c 12.0b 8.0c --- DeltaGard GC 5SC 8.0 fl oz 100.0a 100.0a 100.0a 100.0a Mesurol 75W 0.5 oz 100.0a 100.0a 54.0b 32.0c Sevin SL 30.0 fl oz 100.0a 100.0a 100.0a 68.0b Tempo 20WP 6.7 oz 100.0a 100.0a 100.0a 100.0a Tempo Ultra 1SC 5.4 fl oz 100.0a 100.0a 100.0a 100.0a Means within a column followed by a different letter are significantly different (P < 0.05, Fisher’s Protected LSD). Data were transformed arcsine√x prior to analysis; non-transformed data are presented. Products that did not cause more then 50% mortality 14 DAT were removed from further assessment. A separate set of insects was assessed on all three dates.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2005

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