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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.