Diamondback moth (Plutella xylostella)

Japanese: コナガ(小菜蛾) - コナガ（英語表記）Plutella xylostella

An insect of the Lepidoptera family, Yponomeutidae. Found almost worldwide, its larvae are well known as pests of radishes, Chinese cabbage, turnips, and other Brassicaceae crops. The adult is a small moth with a spread of about 1.5 cm, with white markings on the bottom of its forewings. When it folds its wings and stands still, the white markings on the left and right forewings come together, giving it the appearance of a diamond, hence the name diamond-back moth. Eggs are laid one by one on the leaves. The larvae are caterpillars about 10 mm long that spin threads on the undersides of leaves and feed, leaving only the epidermis.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

鱗翅目スガ科の昆虫。ほとんど全世界に分布し，幼虫はダイコン，ハクサイ，カブなどアブラナ科の害虫として有名。成虫は開張1.5cmくらいの小さいガで，前翅翅底部に白紋があり，翅をたたんで静止したとき左右前翅の白紋がいっしょになり，ダイヤモンドの形に見えるところからdiamond‐back mothという英名がある。卵は葉上に1個ずつ産みつけられる。幼虫は体長10mmくらいの青虫で，葉裏に糸を張って食害し表皮だけを残す。

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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