oup or a trifluoromethyl group, and Z is a hydrogen atom, a halogen atom or a trifluoromethyl group, as an active ingredient; an effective amount of a nonionic surfactant as a dispersant; and an effective amount of at least one member selected from the group consisting of a cellulose, silicic anhydride, a sucrose fatty acid ester and polyoxyethylene polyoxypropylene glycol, as a distintegrator and