【摘要】 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。更多还原

【Abstract】 This experiment shows that Dolerus tritici Chu does heavier damage on wheat in the dry seasons than in the wet seasons. Results also indicated that yield losses of wheat were significantly correlated with the larvae densities (r = 0.9821). The economic threshold can be set at 25 larvae per square meter for yield losses of wheat increased sharply when the insect population density reached this point.更多还原