| abstract |
PROBLEM TO BE SOLVED: To provide an isothiazolecarboxylic acid derivative having an activity of inducing resistance to plant pathogenic bacteria and exhibiting excellent activity as a plant disease controlling agent. SOLUTION: Formula: embedded image Wherein R 1 represents a hydrogen atom, methyl or ethyl, R 2 represents a hydrogen atom or C 1-4 alkyl, R 3 represents a hydrogen atom, chloro, methoxy or nitro, and R 4 represents a hydrogen atom or Chloro, provided that when R 1 , R 3 and R 4 represent a hydrogen atom and R 2 represents methyl, the group CO 2 R 2 is bonded to the 3-position of the phenyl group. Carboxylic acid derivatives. |