Western Corn Rootworm (Coleoptera: Chrysomelidae) Larval Injury to Corn Grown for Seed Production Following Soybeans Grown for Seed Production
JOURNAL OF ECONOMIC ENTOMOLOGY(1996)
摘要
In late June 1987, severe western corn rootworm, Diabrotica virgifera virgifera LeConte, larval injury to corn grown for seed production (inbred corn) was observed within a 3-km(2) 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 corn 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 corn 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 corn rootworm eggs are laid in weed-free soybean fields. Pyrethroid insecticides are routinely used in seed corn for corn earworm, Helicoverpa zea (Boddie), control. In laboratory bioassays, the pyrethroid insecticide, permethrin, repelled western corn rootworm female beetles from treated corn to lay eggs in untreated soybeans and demonstrated that western corn rootworm damage to 1st-yr seed corn could have been caused by pyrethroid use the previous summer in adjacent cornfields.
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关键词
Diabrotica virgifera virgifera,root injury,oviposition,permethrin,repellency,seed corn
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