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(一)玉米病虫蓟马玉米苗期是玉米蓟马危害最为敏感的时期,一旦为害严重,田间形成缺苗断垄,将影响玉米的产量。山东省大部持续高温干旱的天气,极有利于蓟马的发生为害,全省部分地区发生较重,威胁较大。其中,滨州平均虫田率20%,发生田平均百株虫量260头,平均被害株率15.5%,最高65%;菏泽严重的单株达到30头以上,叶片已出现白色斑;聊城,东阿6月21日调查,虫田率100%,套播地块被害株率85.2%,拧心率17.6%;济南,长清、商河玉米卷叶株率达10～15%,章丘20～25%,最高42%。灰飞虱及其传毒的粗缩病随着小麦的收获,灰飞虱向早春玉米田和套播玉米田大量迁移,
(A) corn pest thrips Corn seedling stage is the most sensitive period of the threat of thrips, once severely damaged, the formation of lack of seedlings broken ridge, will affect the yield of corn. Most of Shandong Province sustained high temperature and drought weather, which is very conducive to the occurrence of thrips harm occurred in some areas of the province heavier and more threatening. Among them, the average rate of insect pests in Binzhou was 20%, average number of insect pests in field was 260, average rate of injured plants was 15.5%, the highest was 65%; severe pests in Heze reached more than 30, white patches appeared in leaves; Liaocheng, A survey on June 21, 100% worm field, set sowing plot victimization rate of 85.2%, screw heart rate 17.6%; Jinan, Changqing, Shanghe corn roll leaf rate of 10 to 15%, Zhangqiu 20 ~ 25%, up 42%. Laodelphax striatellus and its transmission of the crude disease With the harvest of wheat, Laodelphax striatelles to the early spring corn and corn sowing a large number of migration,