Population Injury Levels and Sampling of the Pear Rust Mite on Pears in Southern Oregon
Author: Westigard, P. H.
Source: Journal of Economic Entomology, Volume 68, Number 6, 15 December 1975 , pp. 786-790(5)
Publisher: Entomological Society of America
Abstract:Epitrimerus pyri (Nalepa) overwinters in sheltered areas, primarily on 2- to 3-yr-old pear wood. A very small percentage of the population was found on l-yr-old wood, probably reflecting lack of protected sites on this area. Emergence from overwintering sites was followed by movement to the developing fruit buds. Basal portions of the fruit cluster are invaded 1st with pear rust mites reaching the fruit during the bloom period. Though the mite was found on the fruit during the entire growing season, the proportion of the population on this site decreased, whereas that on fruit cluster leaf tissue increased through the summer. Pear rust mite densities were higher through the entire season on fruit taken from the upper sections of trees than those selected from lower portions. In June or July, a pear rust mite density of 5 or more/fruit was sufficient to cause economic damage, but there was an indication that higher populations could be tolerated earlier in the growing season.
Document Type: Research Article
Publication date: 1975-12-15
- 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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