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2011年10月中旬至12月中旬,在河北省中南部地区,对二点委夜蛾越冬虫态及冬前幼虫的田间分布、虫龄、虫量进行了系统调查。结果显示,二点委夜蛾多以老熟幼虫作茧越冬。冬前幼虫主要栖息于有叶片遮蔽或落叶覆盖的地块,普遍为5～6龄。在甘薯地、大豆地、花生地和棉花地虫量较多;果园、蔬菜地、小麦地、玉米地等地块虫量少。幼虫生存与栖息地生态环境关系密切。但室内饲喂显示,幼虫为多食性,喜食多种作物、蔬菜及杂草,甚至可以枯叶为食存活。
From mid-October to mid-December 2011, the field distribution, insect age and insect population of overwintering insect and pre-winter larvae of Plutella xylostella were systematically investigated in central south of Hebei Province. The results showed that the two members of the night-larva more cocoon larvae overwintering. Pre-winter larvae mainly inhabit the leaves covered with leaves or covered plots, generally 5 to 6 years old. In sweet potato, soybean, peanut and cotton, the amount of pests and more; orchards, vegetables, wheat, corn and other places less land masses. The survival of larvae is closely related to habitat ecological environment. However, indoor feeding shows that the larvae are polyphagous and eat a wide variety of crops, vegetables and weeds and can even survive on dead leaves.