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1发病原因玉米青枯病是由多种病原菌侵染造成根系和茎基腐烂,主要由腐霉菌和镰刀菌侵染引起。其中腐霉菌生长的最适温度为24～26℃,镰刀菌生长的最适温度为26～27℃,在土壤中腐霉菌生长要求湿度条件较镰刀菌高。因此,不同生态区病原菌分离频率不同,同一生态区内病原菌分离频率在年度间、区域间存在明显差异。多雨地区以腐霉菌型茎基腐为主,而在干旱地区以镰刀菌型茎基腐为主。
1 causes corn bacterial wilt is caused by a variety of pathogen infection root and stem-based decay, mainly caused by Pythium and Fusarium infection. The optimum temperature for growth of Pythium was 24 ~ 26 ℃ and the optimal temperature for Fusarium growth was 26 ~ 27 ℃. Humidity requirements of Pythium growth in soil were higher than those of Fusarium. Therefore, the frequency of pathogenic bacteria isolation in different ecological zones is different, and the frequency of pathogenic bacteria isolation in the same ecological zone varies significantly between years and regions. In the rainy areas, the stem rot of Humicola was dominant, while in the arid areas, the main stem rot was Fusarium.