Chestnut gall wasp (Dryocosmus kuriphilus)

Japanese: クリタマバチ(栗玉蜂) - クリタマバチ(英語表記)Dryocosmus kuriphilus
Chestnut gall wasp (Dryocosmus kuriphilus)
An insect of the Hymenoptera family, Cynipidae (illustration). A major pest of chestnuts. Only females reproduce; males are rare. Adults are black and about 3 mm long. They emerge once a year in June or July and lay eggs inside the chestnut axillary buds. They overwinter as young larvae, and the following spring, when the larvae begin to develop, the buds swell and become galls. Some galls can reach a diameter of 1 cm or more and contain several larvae. Galled buds prevent leaves from developing, so if there are a large number of infestations, this can affect chestnut production and even cause the entire tree to die.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
膜翅目タマバチ科の昆虫(イラスト)。クリの大害虫。雌だけで繁殖し,雄はまれ。成虫は黒色で体長約3mm。年1回の発生で6~7月に羽化し,クリの腋芽(えきが)の内部に産卵する。若齢幼虫で冬を越し,翌春,幼虫が発育を始めると,その芽は肥大して虫こぶとなる。虫こぶは直径が1cm以上に達するものもあり,中に数匹の幼虫が入っている。虫こぶとなった芽は,葉の展開が妨げられるので,多数寄生された場合はクリの生産に影響し,さらに木全体が枯死することもある。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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