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麦圆叶爪螨对小麦的为害有秋、冬季和春季两个明显时期。秋、冬季为害和春季为害均随着麦圆叶爪螨发生数量的增加,而使小麦产量下降。产量损失率(秋、冬季为害产量损失率y4′,春季为害产量损失率y8)与麦圆叶爪螨发生数量(秋、冬季为x1;春季为x2)均呈极显著的回归关系。其关系式分别为y4′=0.030 0x1-0.882 5,y8=0.016 2x2-0.275 7。拟定350 kg/667m2产量水平下,小麦越冬期和春季麦圆叶爪螨的防治指标分别为33cm单行长小麦上螨口112头和170头。
Wheat leaf mite mite damage to autumn, winter and spring two distinct periods. Autumn and winter damage and spring damage are as the number of wheat leaf mite mites increase, leaving the wheat yield decreased. The yield loss rate (autumn and winter yield loss rate y4 ’, spring damage yield y8) and the number of occurrence of wheat leaf mite mites (autumn, winter is x1; spring x2) showed a very significant regression relationship. The relations are respectively y4 ’= 0.030 0x1-0.882 5, y8 = 0.016 2x2-0.275 7. When the yield of 350 kg / 667m2 was drawn, the control index of wheat leaf mite over winter and spring were 112 cm and 170 respectively.