研究棉花枯萎病的田间分布型,对提高该病普查抽样方法及产量损失估算等的正确性有重要意义。1984年我们在山东聊城县城关,对枯萎病初形成的重病田田间病株和病级分布型进行调查研究,取得初步结果。 调查方法 1984年6月下旬枯萎病发病高峰期,对连作4年棉花的 Studying the field distribution patterns of cotton blight is of great significance to improve the correctness of sampling methods and yield loss estimation of the disease. In 1984 we were in Liaocheng County, Shandong Chengguan, wilt disease formed in the early stage of field sick strains and disease-level distribution were investigated and achieved initial results. Method of investigation Wilt disease peak in late June 1984, even for 4 years of cotton