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Development of a System To Time Scouting for the Lesser Cornstalk Borer (Lepidoptera: Pyralidae) Attacking Peanuts in the Southeastern United States

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We developed a system to time scouting for the lesser cornstalk borer, Elasmopalpus lignosellus (Zeller), in conventionally planted and tilled fields of peanut, Arachis hypogaea (L.). The system used borer-days (BD) to predict when to scout for the damaging larval stage. Borer-days was patterned after degree-days and is a running total of hot and dry weather minus cooler and wetter weather during the growing season. Number of borer-days explained 67% of the variance in the density of E. lignosellus larvae during the 1986 population outbreak in Alabama and Georgia. We calculated the number of borer-days for the past 9 yr and found that borer-days reached >10 in the outbreak years of 1980, 1986, and 1990 but never reached this value in years when E. ligllosellus did not achieve outbreak densities. Applying a granular insecticide at 0 to + 10 BD increased yield compared with yield in untreated plots. Yields did not increase when a granular insecticide was applied at <0 BD. Borer-days can be a valuable tool in predicting when to scout for this insect.

Document Type: Research Article

Publication date: February 1, 1993

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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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