Environmental Entomology (1985) 14, 850-854

M.A. Quinn and A.A. Hower (1985)
Determination of overwintering survivorship and predicting time of eclosion for eggs of Sitona hispidulus (Coleoptera: Curculionidae)
Environmental Entomology 14 (6), 850-854
Abstract: Overwintering survivorship of Sitona hispidulus (F.) eggs in alfalfa during the winters of 1982-1983 and 1983-1984 was greater than 91%. Approximately 50 and 100% of the eggs recovered in the springs of 1983 and 1984, respectively, were oviposited the previous fall, indicating that fall egg population contributes significantly to spring populations of clover root curculio larvae in Pennsylvania. A temperature-dependent sine-wave model was used to predict time of eclosion and to separate spring egg populations into the two cohorts of eggs oviposited in fall and spring. Estimates of egg densities determined in 1983 and 1984 verified predicted time of eclosion in the spring.
(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:
general biology - morphology - evolution
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sitona hispidulus		U.S.A. (NE)