Life Cycle of the Willow Leaf Beetle, Plagiodera versicolora (Coleoptera : Chrysomelidae) in Ishikari (Hokkaido, Japan)

概要

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Life cycle of the willow leaf beetle, Plagiodera versicolora, was studied at Ishikari (43°N, 141°E ; Hokkaido, Japan). The field censuses of adults, egg clutches and pupae on the host-plant, Salix sachalinensis, in 1996 illustrated that P. versicolora showed bivoltine life cycle at Ishikari. The field census of adults in 1997 also illustrated the same dynamic pattern as bivoltine cycle. The overwintering-generation adults began to colonize on the host-plant trees from late May and laid egg clutches from early June. The first generation began to pupate from early July and emerged as adult from mid-July. The first-generation adults had oviposited from late July to end-August. The second generation pupated from mid-August and emerged as adult from late August. All adults disappeared from the host-plant trees by mid-September. In addition, a census on three willow species (S. sachalinensis, S. miyabeana and S. integra) was conducted in 1997. Both adults and egg clutches tended to be observed more on S. sachalinensis than on other species, though S. sachalinensis was not the most abundant willow species at Ishikari. This suggests that the bivoltine life cycle of P. versicolora is maintained on S. sachalinensis.
日本昆虫学会の論文
1999-03-25