VARIOUS MICROENCAPSULATED INSECTICIDE FORMULATIONS FOR THE CONTROL OF PESTS SUCH AS APHIDS AND BEET ARMY WORM. THESE FORMULATIONS EXHIBIT EXCELLENT KNOCKDOWN ACTIVITY TOWARDS BOTH CHEWING AND NON-CHEWING PESTS AS LD50 VALUES FOR TOXICITY IN FEMALE RATS IN THE RANGE OF ABOUT 2,500MGKG-1. SOME OF THESE FORMULATIONS INCLUDE A WALL COMPRISED OF A POLYMER FORMED, FOR EXAMPLE, BY AN INTERFACIAL POLYCONDENSATION OF A WATER SOLUBLE MONOMER AND WATER INSOLUBLE MONOMER, WHICH AT LEAST PARTIALLY SURROUND AN ORGANOPHOSPHATE INSECTICIDE. IN SOME ASPECTS THE ORGANOPHOSPHATE IN THE MICROCAPSULE IS CHLORPYRIFOS. THE MICROCAPSULE HAVE A DIAMETER IN THE RANGE OF ABOUT 2 TO ABOUT 25 MICRON AND THE WALL HAS A THICKNESS IN THE RANGE OF ABOUT 5 TO ABOUT 25 NANOMETERS.
