Method for controlling cowpea pests by releasing natural enemies in insect-proof net

The invention discloses a method for controlling cowpea pests by releasing natural enemies in an insect-proof net, which comprises the following steps of: starting to release the natural enemies in a cowpea vine growing period, uniformly releasing the natural enemies in a field with the insect-proof net once every 7-10 days, continuously releasing the natural enemies for 4 times, and controlling the release amount of the natural enemies to be 200,000 per mu. According to the insect-proof net, the optimal release period, the release frequency and the release times of natural enemies of crops in the insect-proof net are limited, and the release amount is also limited, so that the natural enemies achieve the optimal effect on pests. 本发明公开了一种防虫网内释放天敌防治豇豆害虫的方法，包括以下步骤：在豇豆抽蔓期开始释放天敌，于具有防虫网的田地内均匀释放，每隔7-10天释放一次，连续释放4次，天敌释放量为20万头/亩。本发明限定了防虫网内作物天敌的最佳释放时期以及释放频率和次数，还限定了释放量，使天敌对害虫的作用达到最佳的效果。