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草原毛虫(Orgyia sp)系鳞翅目毒蛾科害虫。在青海境内一年发生一代,以一龄幼虫在茧内、土缝或草根下越冬,至翌春4月中下旬开始活动为害,7月中下旬老熟结茧化蛹,8月初羽化成成虫,8月中下旬为产卵盛期,9月初开始孵化出新一代幼虫,然后进入越冬期。幼虫有六个龄期,以越冬的一龄幼虫的生活期最长,其余各龄约13天左右。每龄更替之间多数钻入草丛或石块、牛粪,凤毛菊叶下,停止活动,不取食,经6天左右开始脱皮,脱皮后经过24—48小时,才外出活动与取食。
Orgyia sp. Department of lepidopteran moth family pests. One generation a year in Qinghai, with the first instar larvae in the cocoons, soil seams or grass winter, to the next spring in mid to late start activities in mid-late July mature cocoon pupation, mature in early August adult , In late August for the spawning peak, beginning in early September hatch a new generation of larvae, and then enter the winter. The larvae have six instars, with the longest winter wintering larvae longest life expectancy, the remaining age about 13 days. Most of the change between the age of each drill into the grass or stones, cow dung, Feng Mao chrysanthemum leaves, stop activities, do not feed, after about 6 days peeling, peeling after 24-48 hours before going out activities and feeding .