ウワミズザクラ樹上におけるクサギカメムシの繁殖

概要

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Oviposition and larval development of Halyomorpha halys on Prunus grayana trees in a coppice were investigated in Akita Prefecture, in the northern part of Japan from 2001 to 2003. Overwintered adults were observed on the trees from early June to late July. Most of the females had mature eggs and egg batches were found on the leaves in early June. Many larvae were observed on the trees from mid-June to mid-September, and progeny adults after mid-August. In 2004, 2nd instar larvae were reared on fruits collected from P. grayana trees in the laboratory; the ratio of developing into 3rd instar (developmental ratio) was 25-40% in June to early July, and increased to more than 80% in late August with fruit maturation. P. grayana trees, which grow widely throughout Akita Prefecture, bear many fruits until mid-September. This suggests that P. grayana is certainly a main food source supporting H. halys reproduction, at least in Akita Prefecture.
2007-08-25