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Quadrant Distribution of Mites on Leaves of Texas Grapefruit1

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Populations of three species of mites sampled from terminal-flush grapefrurit leaves differed in the various quadrants from which they were collected. Eutetranychus banksi McG. was most abundant in the south quadrants during the year except for the 2 months following the peak population, which occurred in May 1955 and .Tune 1956. Citrus rust mites, Phyllocoptruta oleivora (Ashm.), were more numerous on the east as well as the north side of the tree during 8 months of the year, and being most numerous in the northeast quadrant. In a sulfur dusted grove, E. Banksimites were more numerous on the north side of the Tree 1 to 2 months later than on the untreated trees, while citrus rust mites were more numerous on the east quadrants. Brevipalpus spp. were more common on leaves in the west quadrants.

Document Type: Research Article

Publication date: August 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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