Browsing Cotton Report 1991 by Authors
Effect of Plant-Derived Oils on Sweetpotato Whitefly on CottonButler, G. D. Jr.; Coudriet, D. L.; Henneberry, T. J.; Silvertooth, Jeff; Bantlin, Marguerite; USDA-ARS-Western Cotton Research Laboratory, Phoenix AZ (College of Agriculture, University of Arizona (Tucson, AZ), 1991)Cottonseed oil applied to cotton repelled sweetpotato whitefly (SPW) adults up to 8 days in greenhouse tests. Soybean oil (5 %) resulted in reduced numbers of adults and numbers of eggs laid. SPW egg hatch was reduced 84% after treatment with 10% crude cottonseed oil solutions as measured by the number of first instar larval emergence. Also, numbers of whitefly larvae were reduced 99, 91 and 83% on day 6 following treatment with 10% cottonseed oil, S and 1.5% soybean oil, respectively. Negligible plant leaf phytotoxicity occurred from the plant-derived oil treatments.
Microplitis sp. From Australia (Hymenoptera: Braconidae): Development in the Beet Armyworm and Adult Longevity in Relation to TemperatureButler, G. D. Jr.; Henneberry, T. J.; Silvertooth, Jeff; Bantlin, Marguerite; USDA ARS- Western Cotton Research Laboratory, Phoenix AZ (College of Agriculture, University of Arizona (Tucson, AZ), 1991)The effects of temperature on development and longevity of a Microplitis sp. from Australia on the beet armyworm, Spodoptera erigua (Hübner) was studied in the laboratory. Time of development ranged from 25 days at 15°C to 6.2 days at 27.5 °C. The parasite developed twice as fast as its beet armyworm host. Average longevities of male and female parasites were not significantly different.