3,4-Disubstituted benzoxa(thia)zole-2-one derivatives of the formula: ##STR1## wherein R.sub.1 is a halogen atom or methyl group, R.sub.2 is a methyl or ethyl group and X and Y are individually an oxygen or sulfur atom, and their preparation and use as a fungicide.
该公式中的3,4-二取代苯并
噁唑(
硫)酮衍
生物:其中R.sub.1是卤素原子或甲基基团,R.sub.2是甲基或乙基基团,X和Y分别是氧或
硫原子,并且它们的制备和用作杀真菌剂。