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CONTROL OF WESTERN FLOWER THRIPS ON TRANSVAAL DAISY, 2001

CONTROL OF WESTERN FLOWER THRIPS ON TRANSVAAL DAISY, 2001 (G23) DAISY (TRANSVAAL): Gerbera jamesonii H. Bolus ex. Hook. f, 'Delight' Raymond A. Cloyd University of Illinois Department of Natural Resources and Environmental Sciences 384 National Soybean Research Laboratory 1101 West Peabody Drive Urbana, IL 61801 Tel: (217) 244-7218 Fax: (217) 333-4777 rcloyd@uiuc.edu Western flower thrips: Frankliniella occidentalis (Pergande) This test was performed to evaluate the efficacy of selected insecticides in controlling western flower thrips. This test was conducted from 1 Mayto 25 Jun. Plants were potted into 6.0-inch plastic containers in a growing medium consisting of 70-80% Canadian sphagnum peat moss, perlite, dolomitic limestone, gypsum, and a wetting agent. Plants were fertilized with 20-20-20 fertilizer at 100 ppm. Plants were grown in a glass greenhouse (35.0 x 26.0 ft = 910 ft ) on a solid raised bench in a CRD with 10 treatments and four replications per treatment for a total of 40 Transvaal daisy plants. Plants were grown until the flowers were fully opened at which point they were artificially infested with 20 western flower thrips. By using a standardized no. of thrips this would allow us to evaluate percent mortality. Only one flower per plant was used. All other flowers and flower buds were removed. Individual flowers were sprayed to run-off with the appropriate treatment on 20 Jun using a 32.0-oz S bottle containing 16.0 oz of S solution. Greenhouse temp ranged from 68 to 70°F. Treatments were evaluated on 25 Jun (5 DAT). Flowers were harvested and emasculated, and the no. of live, dead, and total no. of thrips were counted.Data were analyzed using a two- way analysis of variance (ANOVA). All treatment means were separated using Fisher's protected least significant difference (LSD) mean separation test. Percent mortality for each treatment was calculated by dividing the no. of dead thrips by the total no. of thrips. The combination of Avid and Ornazin was the only treatment that provided over 50% control of western flower thrips. In fact, the combination was significantly better than either treatment by itself in controlling western flower thrips. None of the treatments were phytotoxic to the flowers or foliage. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF WESTERN FLOWER THRIPS ON TRANSVAAL DAISY, 2001

Arthropod Management Tests , Volume 28 (1) – Jan 1, 2003

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Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/28.1.G23
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Abstract

(G23) DAISY (TRANSVAAL): Gerbera jamesonii H. Bolus ex. Hook. f, 'Delight' Raymond A. Cloyd University of Illinois Department of Natural Resources and Environmental Sciences 384 National Soybean Research Laboratory 1101 West Peabody Drive Urbana, IL 61801 Tel: (217) 244-7218 Fax: (217) 333-4777 rcloyd@uiuc.edu Western flower thrips: Frankliniella occidentalis (Pergande) This test was performed to evaluate the efficacy of selected insecticides in controlling western flower thrips. This test was conducted from 1 Mayto 25 Jun. Plants were potted into 6.0-inch plastic containers in a growing medium consisting of 70-80% Canadian sphagnum peat moss, perlite, dolomitic limestone, gypsum, and a wetting agent. Plants were fertilized with 20-20-20 fertilizer at 100 ppm. Plants were grown in a glass greenhouse (35.0 x 26.0 ft = 910 ft ) on a solid raised bench in a CRD with 10 treatments and four replications per treatment for a total of 40 Transvaal daisy plants. Plants were grown until the flowers were fully opened at which point they were artificially infested with 20 western flower thrips. By using a standardized no. of thrips this would allow us to evaluate percent mortality. Only one flower per plant was used. All other flowers and flower buds were removed. Individual flowers were sprayed to run-off with the appropriate treatment on 20 Jun using a 32.0-oz S bottle containing 16.0 oz of S solution. Greenhouse temp ranged from 68 to 70°F. Treatments were evaluated on 25 Jun (5 DAT). Flowers were harvested and emasculated, and the no. of live, dead, and total no. of thrips were counted.Data were analyzed using a two- way analysis of variance (ANOVA). All treatment means were separated using Fisher's protected least significant difference (LSD) mean separation test. Percent mortality for each treatment was calculated by dividing the no. of dead thrips by the total no. of thrips. The combination of Avid and Ornazin was the only treatment that provided over 50% control of western flower thrips. In fact, the combination was significantly better than either treatment by itself in controlling western flower thrips. None of the treatments were phytotoxic to the flowers or foliage.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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