Various microencapsulatedinsecticide formulations for the control ofpests such as aphids and beet army worm.These formulations exhibit excellent knock-downactivity towards both chewing andnon-chewing pests as LD50 values for toxicityin female rats in the range of about2,500mgKg-1. Some of these formulationsinclude a wall comprised of a polymerformed, for example, by an interfacial poly-condensationof a water soluble monomerand a water insoluble monomer, which atleast partially surround an organophosphateinsecticide. In some aspects theorganophosphate in the microcapsule ischlorpyrifos. The microcapsule have a diameterin the range of about 2 to about 25micron and the wall has a thickness in therange of about 5 to about 25 nanometers.
