Rice stem borer (bivoltine moth)

Japanese: ニカメイガ(二化螟蛾) - ニカメイガ（英語表記）rice stem borer

An insect of the Lepidoptera family, Pyralidae (illustration). Wingspan is 1.9-3cm. Males are generally small and have dark forewings. The forewings are straw-colored with many thin black-brown stripes, and the hindwings are white. Individuals with black-brown forewings are also common. They are found throughout most of Japan, the Korean peninsula, China, Southeast Asia, and southern Europe. The larvae, along with planthoppers, are considered the most important pests of rice cultivation in Japan, and parasitize various grasses such as upland rice, corn, millet, cattails, and wild rice. Both the larvae and adults of those raised on wild rice are large, with a wingspan of up to 3.5cm.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

鱗翅目メイガ科の昆虫（イラスト）。翅の開張1.9～3cm。一般に雄は小型で，前翅の色が暗い。前翅はわら色で，黒褐色の細い条が多数あり，後翅は白色。前翅が黒褐色の個体もよく見られる。ほとんど日本全国，朝鮮半島，中国から東南アジア，南ヨーロッパに分布する。幼虫は，ウンカとともに日本で稲作の最重要な害虫とされ，陸稲，トウモロコシ，キビ，ガマ，マコモなど，種々のイネ科植物に寄生する。マコモで育ったものは，幼虫も成虫も大きく，翅の開張3.5cmに達することがある。

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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