当小麦叶蜂幼虫数量相等时，在较干旱的年份（1988）危害较重；而在气候较湿润的年份（1989）危害较轻。虫量与产量损失成正相关（r=0．9821**），其中以25头／m2幼虫危害的产量损失突增，达显著水平，可以认定为防治指标。 When the number of wheat leaf bee larvae is equal, they are more damaging in the drier year (1988), and less damaging in the wetter years (1989). There was a positive correlation between the amount of insects and yield loss (r = 0.9821 **), of which the yield loss of 25 head / m2 larvae suddenly increased to a significant level, which could be considered as the control index.