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In late June 1987, severe western com rootworm, Diabrotica virgifera virgifera LeConte, larval injury to com grown for seed production (inbred com) was observed within a 3-km2 area near Piper City (Ford County), IL. The rootworm injury occurred in 6 fields that in the prior year had been planted to weed-free soybeans grown for seed production. The severe rootworm injury problem reoccurred in 1st-yr seed com in the same area in 1988 and to varying degrees in the years since (through 1994). Laboratory and field studies were initiated in 1987 to investigate several possible causes of the problem. Under simulated field soil temperature conditions, western com rootworm eggs from the Piper City population did not show evidence of the prolonged diapause trait. Although higher than expected oviposition took place in Piper City soybean fields, a large field study with staggered plantings of soybeans at Urbana, IL, <75 km away, confirmed earlier studies that few western com rootworm eggs are laid in weed-free soybean fields. Pyrethroid insecticides are routinely used in seed corn for com earworm, Helicoverpa zea (Baddie), control. In laboratory bioassays, the pyrethroid insecticide, permethrin, repelled western com rootworm female beetles from treated com to lay eggs in untreated soybeans and demonstrated that western com rootworm damage to 1st-yr seed com could have been caused by pyrethroid use the previous summer in adjacent cornfields.
Document Type: Research Article
Publication date: August 1, 1996
More about this publication?
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.