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冬麦地老虎为暴发性害虫,主要在北疆沿天山一带早春为害麦苗,1963,1973和1983年乌鲁木齐、昌吉和呼图壁县曾大面积发生,其中1983年发生面积达7万多亩,发生重的地块每平方米有虫百头以上,轻的只有十几头.为了对它进行经济有效的防治,我们于1984—1986年连续三年进行小麦产量损失估计试验,确定其防治指标为每平方米有虫32头,即当查得田间虫口密度达此指标时即应防治,否则可不防治.但通常采用的五点式、棋盘式等取样调查法较为费工费时,且所得结果误差较大.而近年国内外推
Winter wheat tiger is an outbreak of pests, mainly in the northern part of the Tianshan area along the northern frontier wheat seedlings malnutrition, 1963,1973 and 1983 Urumqi, Changji and Hutubi County had a large area, of which occurred in 1983 an area of 70,000 mu, In a heavy plot, there are more than a hundred insects per square meter and only a dozen light ones.In order to economically and effectively control it, we conducted a three-year wheat yield loss estimation test in 1984-1986 to determine its control index There are 32 insects per square meter, that is, when the investigation field insect population density of this indicator should be prevention, or may not control .But the commonly used five-point, checkerboard and other sampling method is more time-consuming and cost-effective, and the results The error is larger, while pushing at home and abroad in recent years