A range of action thresholds for the control of silverleaf whitefly, Bemisia argentifolii Bellows & Perring [previously b-strain sweetpotato whitefly, Bemisia tabaci (Gennadius)] was evaluated in 2 field experiments, one at Weslaco, TX, with a low population density of B. argentifolii and one at Yuma, AZ, with a high population density. In Texas, action thresholds for whiteflies of 0.5, 1, and 2 large nymphs per 7.6 cm22of leaf area and of 1, 3, and 6 adults per leaf were tested. In Arizona, action thresholds of 3 and 10 adults per leaf were tested. All thresholds were compared with weekly insecticide treatments and an untreated control. The threshold treatment in Texas that resulted in the highest net return (70% increase over the untreated control) was 0.5 large nymphs per 7.6 cm22 of leaf area. The threshold treatment in Arizona that resulted in the highest net return (170% increase over the untreated control) was 3 adults per leaf. Both of these thresholds resulted in 6 applications of insecticide or ≍1/2 of that used in the calendar treatments.
Document Type: Research Article
Publication date: December 1, 1995
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.