Evaluation of a Pest Advisory for Corn Earworm (Lepidoptera: Noctuidae) Infestations in Soybean
1991; Oxford University Press; Volume: 84; Issue: 2 Linguagem: Inglês
10.1093/jee/84.2.515
ISSN1938-291X
AutoresD. A. Herbert, G. W. Zehnder, Eric R. Day,
Tópico(s)Weed Control and Herbicide Applications
ResumoLarval surveys of second-generation corn earworm, Heliothis zea (Boddie). taken in field corn in mid-July from 1976 to 1989 were used in a pest advisory program to predict potential for later infestations in Virginia soybeans. Estimates of statewide soybean. Glycine max (L.) Merrill. acreage treated for corn earworm were used to evaluate survey predictions. Blacklight-trap and pheromone-trap moth catches from 1983 to 1989 were plotted to study trends in moth activity around soybean fields and to evaluate their use in the pest advisory. Total soybean acreage treated for corn earworm increased linearly with an increase in percent corn ears infested with corn earworm. Generally, <20% corn infestation resulted in 35% infestation resulted in ≈50% or more acreage treated. Corn earworm moth activity around soybean fields increased in late July to early August, peaked one time each season from 15 to 24 August. and ceased by mid- to late September. Pheromone traps provided timely detection of moths in individual fields; however. blacklight-trap catch was a better area-wide indicator of corn earworm infestation severity in soybeans.
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