经过１９９４～１９９７年对匍茎剪股颖草坪禾草云斑病（Ｒｈｙｎｃｈｏｓｐｏｒｉｕｍｓｅｃａｌｉｓ）田间病情的定点调查研究，摸清了禾草云斑病的发生规律。结果表明，病菌以休眠菌丝体在病株及病残体上越冬。在贵州南部地区，匍茎剪股颖草坪禾草云斑病可于４月下旬始见发生，全年病情有两次高峰。第１高峰期出现在５月下旬至７月上旬，第２高峰期山现在９月。病害程度的轻重主要与当年４～１０月份的气温及降水有密切关系。 After the field investigation of the disease of Rhynchosporium secalis from 1994 to 1997, we found out the law of the occurrence of cloudy spot disease in grass. The results showed that the pathogenic bacteria dormant mycelium overwintering in diseased plants and disease residues. In the southern region of Guizhou, the stoloniferous gramineous lawn grass cloud disease can begin to occur in late April, with two peaks throughout the year. The first peak appears in late May to early July, and the second peak is now in September. The severity of the disease is mainly related to the temperature and precipitation from April to October of that year.