棉田害虫天敌种类很多,它们在田间起着控制害虫发生和危害的效应。棉铃虫是棉花生产中的大敌,我们做了如下实验观察。 (一) 不同种天敌对棉铃虫的卵和幼虫日食量情况。在二代棉铃虫发生期(7月份),从田间捕捉不同种类的天敌带回室内饲养,一律饥饿4h后,并都以100(卵和幼虫)分别作食料,重复3次,观察记载日食量(24h)。平均日食量如表 There are many kinds of natural enemies of cotton pests, which play the role of controlling the occurrence and damage of pests in the field. Cotton bollworm is the enemy of cotton production, we made the following experimental observations. (A) different types of natural enemies of cotton bollworm eggs and larvae daily food intake situation. In the second generation of cotton bollworm (July), captured from the field of different types of natural enemies back to the indoor rearing, all starved 4h, and 100 (eggs and larvae), respectively, for food, repeated 3 times, observing the eclipse (24h). The average daily eclipse volume as the table