ヘリグロテントウノミハムシの生活史に関する研究　Ｉ　種々の寄主植物上での加害様相と発生経過

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  • Studies on the life history of the fleabeetle, Argopistes coccinelliformis Csiki (Coleoptera: Chrysomelidae). I. Feeding habits and seasonal development on various trees of oleaceae.
  • ヘリグロテントウノミハムシ ノ セイカツシ ニ カンスル ケンキュウ 1 シュ
  • I. Feeding Habits and Seasonal Development on Various Trees of Oleaceae
  • I. 種々の寄主植物上での加害様相と発生経過

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Among many ornamental trees, the Fortune Osmanthus, Osmanthus×Fortunei CARR., has been known as a tree with little infestation by insect pests. In recent years, however, injury by the fleabeetle Argopistes coccinelliformis on this tree has become conspicuous. Research was therefore conducted to investigate fleabeetle feeding habits and seasonal development in Chiba Prefecture and the city of Tokyo. Overwintered adults appeared on host trees from mid-March with a peak in mid-April to early May. Females started to deposit eggs in tissues of new sprouts and leaves from mid-to late April. Number of eggs and larvae on the tree increased until May. Leaf-mining larvae could develop only in new leaves. They passed 3 instars on the plant and became pupae in the soil. Egg period was about 10 days, and both larval and pupal periods were about 20-30 days. New adults started to emerge in mid-June with a peak in late June to early July. They mainly injured early stages of mature leaves. In cases of severe damage, trees shed their leaves. Number of adults on the trees and their feeding activity decreased in mid- to late July, and this low level continued until autumn. Adults moved to the hibernating sites between October and December. Developmental success of the beetle varied on different host plants. Overall results suggest that the life cycle of this beetle harmonizes well with the phenological aspects of Osmanthus×Fortunei, O. heterophyllus and Ligustrum japonicum and thus is abundant on these species.

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