Seasonal Distribution of Mites on Texas Grapefruit 1

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The important species of mites on grapefruit in Texas were found to f1uctuate considerably during the year. Eutetranychus banksi (McG) was found to have its greatest increase in population during May-July. Increases were associated with periods of very little mill fall, lower relative humidity and 8 to 10 hours per day of average temperatures above 80. Rainfall appeared to be a regulatory factor. Populations of the citrus rust mite, Phyllocoptruta oleivora (Ashm.), increased particularly during periods of high relative humidity while periods of low relative humidity and very windy weather seemed unfavorable. Rust mites increased generally following periods of greater precipitation, and increases in winter occurred each year.

Typhlodromus spp. increased during .May and numbers were greater during the summer and fall months. Tydeid and Brevipalpus mites were more numerous during the latter half of the year.

Document Type: Research Article

Publication date: April 1, 1959

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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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