Evaluation of Beauveria Bassiana (Mycotrol® WP) for Control of Whitefly in Spring Cantaloupes, 1995

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Abstract
Cantaloupe was planted in slant beds on 80-inch centers 17 March, at the USDA Irrigated Desert Research Station, Brawley CA. Plots were 5 rows by 40 feet long, with end buffers of 5 feet and buffers of two rows between plots, left planted. Design was a randomized complete block with 4 replicate plots per treatment. Treatments were Untreated, Carrier (0.04% Silwet L77) only, and Mycotrol WP at 0.125, 0.25 and 0.5 lbs of formulation (2.5, 5, and 10 X 1012 conidia, resp.) per acre. Applications were initiated 2 May, when whitefly numbers had reached 2.5 per cm2 of leaf, and were continued weekly for 6 weeks, for a total of 7 applications of all materials. Applications were made with a backpack airblast sprayer at 30 gpa (treatments 1-5) or 50 gpa (treatments 6-7), with material and gallonage rates based on a treated acre. Whitefly immatures were counted on 1, 16, 29 May and 20 June using leaves having mixed populations of small and large nymphs (generally Leaf 7-10 from base of plant), 10 leaves per plot. Nymphs were counted in two 1.2 cm or 2.4 cm diameter discs per leaf, depending upon overall numbers. Insect data was subjected to n transformation before ANOVA; means were separated by SNK Test (p=.05). Yields for the Untreated and Vilb Mycotrol treatment plots were determined on 18 June by collecting all fruit developed to net stage and older from one center row of each plot, and determining number and individual weights per 40 row-feet, adjusted for differences in stand count. Treatment means were compared using Student’s T test. Yield data were extrapolated to a per acre value for reporting.

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