Effects of Timing of Diapause Induction on Winter Survival and Reproductive Success in Hyphantria cunea in a Transition Area of Voltinism

概要

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Pupae of the fall webworm, Hyphantria cunea, entered diapause either as the second or third generation in Tsukuba, Japan. In the second generation, the incidence of diapause increased with the progress of season from early to late August, whereas all individuals of the third generation entered diapause in late autumn. Pupae in the two different generations overwintered and emerged as adults almost synchronously in the next spring. When diapause pupae were kept outdoors, the weight loss before overwintering was larger in pupae of the second generation than in those of the third generation. However, the weight loss during the winter was not different between the two generations. The rates of winter survival and egg production were higher in individuals from the third generation than in those from the second generation. Weight loss before overwintering and egg production were negatively correlated in females of the second generation, but not in those of the third generation. These results suggest that a reduction of energy reserves for overwintering and subsequent reproduction during the pre-hibernation period was larger in individuals entering diapause in the second generation than in those entering diapause in the third generation.
日本昆虫学会の論文
2000-09-25