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Population studies and greenhouse experiments were conducted in 1971 and 1972 to determine the status and reproductive factors of Empoasca fabae (Harris) on centra1 Iowa soybeans. Analyses showed that potato leafhopper numbers varied significantly between years and among soybean stages within years. There were no significant differences among fields sampled, and the proximity of alfalfa to soybeans had no significant effect on potato leafhopper numbers collected in the soybean fields. When natural population densities were plotted against economic-injury levels (EIL), the densities did not reach the EIL throughout the soybean growing seasons. A major factor contributing to low potato leafhopper numbers in these pubescent soybeans was low ovipositional rates, as indicated by experimental greenhouse infestations.
Document Type: Research Article
Publication date: April 1, 1974
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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.