Patent ID: 7837988
Filing Date: 2010-11-23
Classification: A01N

Abstract:
1. A controlled slow release microbial pest control composition in the form of a briquette that can be applied to an aqueous pest breeding site, the composition comprising a slow release matrix comprising a plaster slow release agent, hardened by the addition of a sufficient hydrating amount of water, and an effective amount of gypsum accelerator, the plaster having a compressive strength of 1,000 to 18,000 lbs. per square inch, the composition having dispersed in the matrix a particulate comprising an effective pest population controlling amount of a microbial pest control agent and a powdered polymeric buoyant agent a specific gravity of 0.99 to 0.85, the powdered polymeric buoyant agent having void space; wherein the powdered polymeric buoyant agent comprises the microbial pest control agent present within the void spaces of the polymeric buoyant agent; wherein said composition can be used in the form of a sinking pest control briquette that when immersed in water of an aqueous pest breeding site, the slow release briquette sinks in the aqueous pest breeding site, and as the plaster dissolves, the particulate is released to the surface of the aqueous pest breeding site; wherein the mechanism of slow release is the dissolution of the plaster; and wherein the particulate releases at the water surface an effective pest control in the amount of a microbial pest control agent for greater than 154 days, and that when dry the composition does not release the agent.