5H-1,3,4-thiadiazolo(3,2-A)pyrimidin-5-one derivatives and fungicidal compositions containing the same

摘要

A class of novel 5H-1,3,4-thiadizaolo[3,2-a]pyrimidin-5-one derivatives are disclosed. These compounds exhibit remarkable fungicidal activities for pathogenic fungi of cucumber gray mold, cucumber downy mildew, Alternaria sooty spot of Chinese mustard, apple Alternaria leaf spot, pear black spot, rice blast, tomato late blight, etc.