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系统观察结果表明，四代棉铃虫卵及低龄幼虫主要分布于棉株上部３台果枝的外围３个果节内。在不同器官上，蕾上卵量最多，其次为嫩叶正面，第三为幼铃。一龄幼虫以蕾上最多，二龄幼虫蕾和幼铃上各占一半左右，三龄幼虫大部分转移到铃上。由蕾及其它有关部位上卵量可推算出全株总卵量，这可用于简化测报手段。低龄虫在蕾、嫩叶及幼铃等棉花幼嫩部位存活率较高，在中老叶及大铃上存活率低。用药时应把上部果枝及外围果节上的蕾、嫩叶及幼铃作为重点喷药对象。
The results of systematic observation showed that the four generations of cotton bollworm eggs and young larvae were mainly distributed in the outer 3 fruit nodes of 3 fruit branches in the upper part of the cotton plant. In different organs, buds on the largest amount of leaves, followed by young leaves positive, the third for the young bell. The first instar larvae in the bud up to the second instar larvae and young bell on about half of each, most of the third instar larvae transferred to the bell. By bud and other relevant parts of the amount of eggs can be calculated from the total amount of eggs, which can be used to simplify the means of measurement. Low-age insects in buds, young leaves and young bell cotton and other parts of the survival rate is high, in the old leaves and large bell low survival rate. Medication should be the upper fruit branch and the outer fruit buds, young leaves and young bell as a key object of spraying.