SOIL TREATMENT AGENT OR SEED TREATMENT AGENT UNDERSTANDING QUINOLINE COMPOUNDS OR SALTS OF THESE AS ACTIVE INGREDIENT, OR METHOD FOR PREVENTION OF PLANT DISEASES THROUGH THEIR USE.
A soil treating agent or a seed treating agent having excellent prevention effects against various plant pathogens (particularly against rice blast) is provided. A soil treating agent or seed treating agent, comprising one or more compounds of the general formula (Ia), (Ib) or (Ic): (wherein R 1 , R 2 : C 1 -C 6 alkyl (may be substituted), aryl (may be substituted), heteroaryl (may be substituted), aralkyl (may be substituted) and the like； R 3 , R 4 : H, C 1 -C 6 alkyl (may be substituted), halogen, C 1 -C 6 alkoxy and the like； X: halogen, C 1 -C 6 alkyl (may be substituted), C 2 -C 6 alkenyl (may be substituted), C 2 -C 6 alkynyl (may be substituted), aryl (may be substituted), heteroaryl (may be substituted), C 1 -C 6 alkoxy and the like； Y: halogen, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, OH； n: 0 to 4； m: 0 to 6) or salts thereof as an active ingredient.
