Turnip moth (Agrotis segetum)

Japanese: カブラヤガ(蕪夜蛾) - カブラヤガ（英語表記）Agrotis segetum

An insect of the Noctuidae family in the Lepidoptera order. Its English name is turnip moth, and its Japanese name Kaburayaga is derived from this. The larvae are well known as pests of various vegetables, flowers, and other plants in farms and gardens. They span about 4cm. The color of the forewings varies considerably, but males are pale gray-brown and females are slightly darker. The hindwings are also nearly white in males and gray with dark wing veins in females. The larvae hide on the ground during the day and climb up to low plants at night to eat the leaves. The larvae of this moth are called root-cutting insects because they have a habit of cutting the roots of flowers and crop seedlings, causing them to fall.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

鱗翅目ヤガ科の昆虫。英名をturnip mothといい，和名カブラヤガはこれに由来するが，幼虫は各種の蔬菜（そさい）類や草花など，圃場（ほじよう），庭園の害虫として著名である。開張4cm内外。前翅の色彩にはかなり変異があるが，雄では淡い灰褐色，雌ではやや暗色を帯びる。後翅も雄では白色に近く，雌では灰色を帯び翅脈が暗色を呈する。幼虫は昼間は地表に潜み，夜間低い植物上に上って葉を食べる。このガの幼虫がネキリムシ(根切虫)と呼ばれるのは，草花や作物の苗の根際に加害切断して茎を倒す習性があるためである。

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