利用稻田田水中噬菌体的消长预测水稻白叶枯病的发生发展,经1974～1975年两年的试验研究,初步得出一些结果。一、当田水中噬菌体数含量上升到500个/毫升以上出现第一个高峰时,大约10天以后,白叶枯病的发生也将出现高峰,发展速度很快。二、在不同田块之间,田水中噬菌体的多少与田间病害的轻重有一定相关性。如据今年早稻八块田测定,其中四块田水中噬菌体数量一直很低,一般都在每毫升几十个噬菌体,八 Prediction of the occurrence and development of bacterial leaf blight in paddy field water using phages, the pilot study from 1974 to 1975, some preliminary results. First, when the number of phage in the field water increased to more than 500 cells / ml, the first peak appeared. After about 10 days, the occurrence of bacterial blight will also peak and develop rapidly. Second, between different plots, the number of phage in field water and the severity of disease in the field have some relevance. According to this year’s eight rice fields in early rice determination, of which four field water phage number has been very low, usually in dozens of phages per milliliter, eight