越冬之謎 粘虫是一种为害庄稼很广而又严重的害虫。据调查,粘虫幼虫取食的植物有十字花科、菊科、蔷薇科等16种之多,特別喜欢取食禾本科植物;为害的庄稼有水稻、小麦、玉米、谷子、高粱和甘蔗等,大发生时亦常常为害棉花、亚麻、甜菜、蕃茄、豆类等。粘虫幼虫从卵里孵化出来时,虫体很小,长大后身体顏色变化很多,有青褐色、有灰黑色、藍色等, The mystery of wintering Mythimna separata is a kind of pest that damages a wide and serious crop. According to the survey, the armyworm larvae feed on as many as 16 species, such as Cruciferae, Compositae, and Rosaceae. They particularly like to eat gramineous plants; crops affected include rice, wheat, corn, millet, sorghum and sugar cane. In times of occurrence, it often harms cotton, flax, beets, tomatoes, and beans. When the armyworm larvae hatch from eggs, the body size is very small. After growing up, the color of the body changes a lot. There are greenish-brown, grayish-black, blue, etc.