Environmental Entomology (1983) 12, 1459-1463

M.R. Jeffords, C.G. Helm and M. Kogan (1983)
Overwintering behavior and spring colonization of soybean by the bean leaf beetle (Coleoptera: Chrysomelidae) in Illinois
Environmental Entomology 12 (5), 1459-1463
Abstract: Adult bean leaf beetles, Cerotoma trifurcata (Forster), were trapped as they entered Illinois woodlots during October 1979 and 1980. Soil litter samples and emergence traps detected the presence and distribution of overwintering beetles within woodlands. Spring beetle emergence from overwintering sites began in April and extended through May. In 1980 the majority of beetles emerged in May, but in 1981 the majority emerged during April. Beetle emergence and soybean planting dates were well synchronized in 1980, and poorly synchronized in 1981, resulting in a population crash. A simple predictive model for beetle emergence based on degree-day accumulation was developed. This proved superior to simple calendar date predictions of peak colonization flights.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
thresholds/decision-support systems

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cerotoma trifurcata	Soybean (Glycine max)	U.S.A. (mid N)