除治棉铃虫三字诀“查、看、定”一、查蛾峰，看卵色，定防治适期棉铃虫在河北省一般一年发生四代。其中二、三、四代主要危害棉花。但不论哪代都有始、盛、末三期。为确切把握防治适期，就必须掌握正确的田间测报方法。一般做法是，选择现蕾早（二代）、蕾铃多（三代）和... In addition to the three-word formula bollworm “investigation, look, set” First, check the moth peak, look at the egg color, set the appropriate period of control Cotton bollworm in Hebei Province in general occurs four generations a year. Two, three, four major hazards of cotton. But no matter what generation have the beginning, Sheng, the last three. In order to accurately grasp the appropriate period, we must master the correct method of measuring the field. The general approach is to choose early bud (second generation), Lei Ling more (three generations) and ...