1975—1979年,鄂北岗地几乎每年都有大面积小麦被麦圆蜘蛛危害。我场受害面积占麦类总面积的50—70％,局部地区猖獗成灾。麦类受害后,一般减产10％左右,严重的减产20％以上。1979年我场考查,当百苗虫量达到750头时小麦减产23.1％,即每亩减产60斤。 From 1975 to 1979, a large area of ​​wheat was harmed by wheat round spiders in almost every year in northern Hubei. My victim area accounted for 50-70% of the total area of ​​wheat, rampant disaster in some areas. Wheat victims, the general reduction of about 10%, a serious reduction of more than 20%. My test in 1979, when a hundred seedlings reached 750 when the first wheat cut 23.1% yield, that is, cut 60 pounds per mu.