CONTROLLING AGENT AGAINST PLANT BLIGHT CONTAINING CLATHRATE COMPOUND AS ACTIVE CONSTITUENT

PURPOSE:A controlling agent against plant blights, containing clathrate compound of 5-methyl-1,2,4-triazolo[3,4-b]benzothiazole (germicide) trapped in beta- cyclodextrin, and having improved residual effect of the above-mentioned germicide. CONSTITUTION:A controlling agent against plant blights containing a clathrate compound of 5-methyl-1,2,4-triazolo[3,4-b]benzothiazole trapped in beta-cyclodextrin as an active constituent in an amount of 0.1-99.9wt%, preferably 0.2-80wt%. The above-mentioned benzothiazole is a germicide, having low toxicity and penetration property, capable of exhibiting remarkable effect on blast of rice plants but causing volatilization of the active constituent on foliar application in field under high temperature and humidity conditions due to its high vapor pressure. Thus, it is difficult to keep the improved effect sufficiently and stably for a long period. The above-mentioned clathrate compound permits the prevention of the volatilization of the active constituent, and the residual effect can be remarkably improved.