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Citrus Thrips (Thysanoptera: Thripidae) Phenology and Sampling in the San Joaquin Valley

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Citrus thrips, Scirtothrips citri (Moulton), was monitored over a 3-year period in San Joaquin Valley, Calif., navel orange groves to compare population trends observed using alternative sampling methodologies and to determine thermal accumulations required for development. Citrus foliage monitoring did not indicate a direct relationship between timing of the end of shoot growth, petal fall, and the level of citrus thrips fruit scarring. Over the first three spring generations, citrus thrips were found in greatest numbers in the northeast quadrant, although first-generation larvae in the south developed more rapidly than larvae in the north. Comparisons among sampling techniques (D-Vac, pupation papers, ground traps, yellow cards, and fruit counts) and their ability to predict scarring were inconclusive. The period between the first and second citrus thrips generations measured from the peak of a particular life stage to the next peak was 156 degree-days above a lower threshold of 14.59°C. The period between the second and third generations was not consistently related to heat units based on this lower threshold.

Document Type: Research Article

Publication date: December 1, 1986

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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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