在“农业学大寨”群众运动推动下,馆陶县测报站和广大贫下中农,根据棉铃虫产卵特点和幼虫为害习性,从1974年开始利用毒土防治,取得了较好的效果。使用面积至1976年已推广到七万亩,占全县棉花种植面积的70%。实践证明,利用毒土防治棉铃虫具有:1方法简便、省工、省药;2.药量集中,防治效果较高;3不受工具限制,便于打人民战争;4.对天敌杀伤少等优点,受到群众普遍欢迎。 棉铃虫在我区一年发生四代,一般以第二代发生较重,有的年份第三代也较重。经多年观察,二代棉铃虫在棉株着卵量:生长点占11.3%,顶叶占47%,顶部果枝群尖和中层以上的大叶占32.9%,其它部位仅占8.8%。卵孵化后,幼虫首先取食卵壳,随即爬到叶正面啃食叶肉,继而为害生长点,嫩叶和幼蕾,三龄后活动 Driven by the mass movement of “Learning Agriculture in Dazhai”, the Guantao County survey station and the vast majority of poor and middle peasants have made good use of toxic soil control since 1974 according to the spawning characteristics and larval habit of the cotton bollworm. Use area to 1976 has been extended to 70,000 mu, accounting for 70% of the county cotton acreage. Practice has proved that the use of toxic soil control bollworm has: 1 the method is simple, labor-saving, provincial medicine; 2 concentration of drugs, prevention and control of high; 3 not subject to tools, easy to fight the people’s war; Advantages, generally welcomed by the masses. The occurrence of four generations of cotton bollworm in our district a year, generally heavier than the second generation, and some third generation of the year also heavier. After years of observation, the second-generation cotton bollworm lay eggs in cotton plants: the growth point accounted for 11.3%, the top leaves accounted for 47%, the top branches and mid-above the large leaves accounted for 32.9%, other parts accounted for only 8.8%. After hatching eggs, larvae first eat eggshell, then climb to the front of the leaf eating necks, and then damage the growth point, young leaves and young buds, after the third age activity