The study indicated continous corpping for years, planted inresist disease varieties, unusual climate, lacking of scientific methed of prevention and cure, returning maize straw to infield are major factors to creat head smut.

• 研究表明,玉米连年重茬,种植感病品种,气候变化异常,缺乏科学的防治措施及部分地区推广的秸秆还田是诱发丝黑穗病发生的重要因素。