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去年小麦黄矮病在我县为中度偏重的发生年份。4月中旬气温较高,比历年同期旬均温高1.7℃。4月25日,大面积麦田就出现了麦二叉蚜,比往年提早15天左右。且虫口上升较快,如5月4日观测田的百株蚜量3.5头,10日上升为12.5头,生产队大田竟上升到40～50头。加之5月14～18日连续出现低温(0℃以下),降低了小麦的抗病
Last year, wheat yellow dwarf disease in my county as the emphasis on the year of occurrence. Temperatures were higher in mid-April, 1.7 ℃ higher than the average temperature in the same period of last year. April 25, a large area of wheat appeared wheat aphids, 15 days earlier than usual. And the mouth of the insect population rose rapidly. For example, on May 4, the number of hundred aphids in the field was 3.5 and on the 10th it rose to 12.5. The production team field actually rose to 40-50. Coupled with May 14 to 18 consecutive low temperature (0 ℃ below), reducing wheat disease resistance