甘蓝夜盗虫的老龄幼虫(5—6龄),白天都潜伏在植株附近的表土下或大的枯叶下,只在晚上8点以后出来取食。于是,就本着敢想敢干的精神以25％DDT乳剂200倍液破例的在夜间进行了施药防治的尝试。防治的结果令人满意,兹将经过介绍如下: 1.施药前的准备工作:先于白天在田间按每2垧地划分一片,并准备好药剂、喷雾器、标记以及其施 Night larvae of cabbage night larvae (5-6 age), lurking in the daytime under the surface of the plant near the surface or under the dead leaves, only after 20 o’clock in the evening out to eat. So, in the spirit of dare to think and dare to do with 25% DDT emulsion 200 times the case of an example of the night at a drug control attempt. The results of the control are satisfactory and will be described as follows: 1. Pre-application preparation: Prior to daytime use, divide each area by field and prepare the potion, sprayer, marking and application