Agrochemical compositions are described which contain a carboxylic acid salt of dodecylguanidine and a compatibility agent for slowing down the dissociation reaction of the carboxylic acid salt of dodecylguanidine in an aqueous medium. Also, the formation of anionic dodecylguanidine is suppressed or prevented. The ratio of the dodecylguanidine acetate to that of the compatibility agent in the agricultural compositions is below 5.0, preferably between 3.0 and 0.5, more preferably equals 1.4.