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1959年在山东烟台专区的莱阳、 海阳、蓬莱等县发现棉铃虫为害花生, 第一天检查受害率仅有10％左右,第二天发展到37％,第三天即达100％。有的地块平均有幼虫两头。田间很难找到完整的嫩叶,使花生的生长发育受到了严重的影响。 棉铃虫为害花生的特点是:初龄幼虫啃食叶肉,以后各龄则从叶缘取食或将嫩叶咬穿。幼虫特别喜欢吃花。为害盛期,每天开的花全被吃掉。 我们用5％DDT粉剂每亩3～5斤喷粉和25％的
In 1959, pests of Helicoverpa armigera were found in Laiyang, Haiyang and Penglai counties in Yantai, Shandong Province. The damage rate was only 10% on the first day, 37% on the second day and 100% on the third day. Some plots have an average of two larvae. Field is difficult to find a complete young leaves, peanut growth and development has been seriously affected. Cotton bollworm Peanut pests damage is characterized by: the first instar larvae eating leaf, after all the age from the leaf edge feeding or the young leaves bite through. Larvae particularly like to eat flowers. Harmful period, every day to open the flowers were eaten. We use 5% DDT powder 3 ~ 5 pounds per acre powder and 25% dust