近年来，竹山县南部高山玉米丝黑穗病发生范围迅速扩大，发生程度逐年加重。近日，笔者赴海拔１３００ｍ的顺水坪村调查时发现，该村玉米丝黑穗病目前发病地块己高达１００％，平均发病株率在３０％左右，损失玉米产量３成以上，农户普遍对此表示极为忧虑．据调查，玉米丝黑穗 In recent years, the scope of occurrence of maize head smut in southern mountain of Zhushan County has rapidly expanded, and the degree of occurrence increased year by year. Recently, the author went to an altitude of 1300m Shunshui Pingcun survey found that the village corn smut disease incidence of the block has been as high as 100%, the average incidence of about 30% of the plant, the loss of more than 3 percent of corn production, farmers generally Expressing great concern. According to the survey, corn silk black ears