THE PRESENT INVENTION PROVIDES A COMPOSITION FOR CONTROLLING PLANT DISEASE COMPRISING CARBOXAMIDE COMPOUND REPRESENTED BY A FORMULA (I): WHEREIN REPRESENTS A HYDROGEN ATOM OR METHYL GROUP, R2 REPRESENTS A METHYL GROUP,A DIFLUOROMETHYL GROUP OR A TRIFLUOROMETHYL GROUP;AND A COMPOUND REPRESENTED BY A FORMULA (A):WHICH HAS AN EXCELLENT CONTROLLING ACTIVITY ON PLANT DISEASES.