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.
                            揭示了一类新颖的5H-1,3,4-
噻二唑并[3,2-a]
嘧啶-5-酮衍
生物。这些化合物对黄瓜灰霉病、黄瓜霜霉病、芥菜黑粉病、苹果
交链孢病、梨黑斑病、稻瘟病、番茄晚疫病等病原真菌表现出显著的杀菌活性。