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Effects of Spray Droplet Size, Dosage, and Solution per ha Rates on Mortality of Twospotted Spider Mite

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Controlled sizes of droplets were combined with dosages of formetanate at various solution rates per ha to evaluate effects on the mortality of Tetranychus urticae Koch in the laboratory, An experimental uniform droplet generator produced uniform droplets of 100, 150, 200, 250, and 300 m diam. An equation was developed to show the effect of droplet size, dosage, and solution application rates on mite mortality. Dosage could be reduced, if the solution rate were reduced, without decreasing the mortality. When all other factors were equal, different droplet sizes had little ellect on the mortality rate.

Document Type: Research Article

Publication date: April 1, 1978

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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.
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