Physicochemical properties and control effect of a pin formulation for controlled release using biodegradable materials as a matrix

摘要

A controlled-release insecticide formulation, PIN formulation, was developed to extend efficacy against aphids, Macrosiphum ibarae, in floriculture. Pin formulations were made by injection-molding in a module with imidacloprid, biodegradable aliphatic polyester resin, starch and calcium carbonate. The incorporation rates of active ingredient (a.i.) into the formulations were recorded at more than 99 percent. The release rate of a.i. from the pin formulation into water under static conditions was about 40 percent even at 70 days after treatment. Degradation of inert materials of the formulation during 5 months under field conditions was more than 70 percent. An excellent control effect against rose aphids by the formulations was maintained over 145days after application under field trial conditions.