Rice leaf roller - Rice leaf roller

Japanese: コブノメイガ - こぶのめいが

An insect of the Lepidoptera order, Pyralidae family. This moth has a span of about 17 mm, and the leading edge of the male's forewings is covered with black scales, which look like a lump, hence the Japanese name. The larvae are pests of Poaceae plants such as rice, wheat, and barnyard millet, and appear four times a year in warm regions and twice a year in cold regions. In warm regions, they overwinter as mature larvae in the form of pupae, but in cold regions, they overwinter as larvae. They live in rice and other plant leaves by stitching them together, and eat the outer epidermis and mesophyll, causing the affected leaves to become translucent. Damage can be seen from the nursery stage, but the damage is greatest during the heading stage in summer, and if they occur frequently, rice yields can decrease.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

鱗翅目メイガ科の昆虫。開張17mm内外のガで，雄の前翅前縁には黒鱗の塊があり，これが瘤のように見えるところから表記の和名がついている。幼虫はイネ，ムギ，ヒエなどイネ科植物の害虫で，温暖地では年4回，寒冷地では年2回発生する。暖地では老熟幼虫かさなぎで越冬するが，寒地では幼虫で越冬する。イネなどの葉をつづり合わせてその中にすみ，表面の表皮と葉肉を食べるので，被害を受けた葉は半透明となる。苗代期から被害が見られるが，夏の出穂期に被害が大きく，多発するとイネの収量が減少することがある。

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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