Immigration, Sex Ratio, and Local Movement of the Potato Leafhopper (Homoptera: Cicadellidae) in a Pennsylvania Alfalfa Field
Authors: FLINN, PAUL W.; HOWER, ARTHUR A.; TAYLOR, ROBIN A. J.
Source: Journal of Economic Entomology, Volume 83, Number 5, October 1990 , pp. 1858-1862(5)
Publisher: Entomological Society of America
Abstract:The distribution and immigration trends of Empoasca fabae (Harris) in a managed alfalfa, Medicago sativa L., field were studied over a 3-yr period. In the second alfalfa growth cycle, E. fabae immigration into the field usually began after the alfalfa reached a height of 5 em. The rate of immigration into the field was constant until halfway into the crop growth cycle, after which it usually decreased. Sex ratios of adult E. fabae were 80% female in the second growth cycle and 50% female in the third growth cycle. In two of the three years, the sex ratios were 44% female at the end of the third growth cycle. This may have been due to a greater tendency for female than for male E. fabae to leave the field at this time of the year. During the second and third growth cycles of 1980, E. fabae density was about 76% higher in exterior plots than in interior plots. This difference in density did not change appreciably during the second or third growth cycles. Aggregations of adult E. fabae in the exterior plots were probably caused by an accumulation of immigrants from other locations outside of the field.
Document Type: Research Article
Publication date: October 1990
- 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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