Oriental corn borer

Japanese: アワノメイガ - あわのめいが(英語表記)oriental corn borer
Oriental corn borer

This moth belongs to the order Lepidoptera and the family Pyralidae. It is widely distributed from Asia to Australia, and is commonly seen throughout Japan. The adult has a wing span of about 30 mm, is nocturnal, and often flies to lights. The larvae are pests that feed on grasses such as corn, foxtail millet, millet, and wheat, and occur once a year in cold regions and three times a year in warm regions, depending on the region. They have the habit of feeding on the stems of the host plants and releasing insect excrement from the feeding opening by stringing it with silk. They attach to ears of corn and other crops that have not yet formed ears, and sometimes enter the kernels. Before 1970, it was considered to be the same species as Osterlinia nubilalis , which is distributed in Europe, but due to morphological differences, the Asian species was considered to be a different species. The host plants and habits of the larvae of the European species are quite similar to those of the Asian species.

[Hiroshi Inoue]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

昆虫綱鱗翅(りんし)目メイガ科に属するガ。アジアからオーストラリアに広く分布し、日本全土にごく普通にみられる。成虫ははねの開張30ミリメートル内外で、夜行性でよく灯火に飛来する。幼虫は、トウモロコシ、アワ、キビ、ムギなどイネ科植物を食べる害虫で、寒地では年1回、暖地では年3回発生するなど、地域によって変化がある。食草の茎の中に食入し、食入口から虫糞(ちゅうふん)を糸でつづって出す習性がある。トウモロコシなどの出穂していない穂についたり、また、実に入ることもある。1970年以前は、ヨーロッパに分布するオステリニア・ヌビラリスO. nubilalisと同一種とされていたが、形態的な違いから、アジアのものは別種とされた。ヨーロッパ産種は、幼虫の食草も習性もアジアのものとかなりよく似ている。

[井上 寛]

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