PROBLEM TO BE SOLVED: To obtain a blight exterminating agent for laver cultivation, capable of exterminating blight of cultivated laver and miscellaneous seaweeds including diatom, and scarcely having adverse effects on the surrounding environment, nor on leaf bodies of the laver. SOLUTION: The blight exterminating agent for the laver cultivation contains one or more kinds selected from the group consisting of (A) a carboxylic acid expressed by formula 1 (R1is a 4C or 14-16C straight-chain alkyl, a 3-9C branched-chain alkyl, a 6-8C alkyl which contains a cycloalkane ring, a 3-15C straight-chain alkenyl, a 4-9C branched-chain alkenyl, a 6-9C alkenyl which contains a cycloalkene ring, a 3-5C acyl, a 3-8C alkoxymethylene, a 4-10C hydroxyalkyl or a 1-3C alkyl in which at least one hydrogen atom is substituted with mercapto or an alkylmercapto) and its salt, (B) a thiocarboxylic acid expressed by formula 2 (R2is a 1-2C alkyl) and its salt, and (C) an aromatic carboxylic acid and its salt, and further contains a pH adjusting agent. COPYRIGHT: (C)2005,JPO&NCIPI
