Barclay, Hugh J.van den Driessche, P.2009-08-202009-08-2019882009-08-20http://hdl.handle.net/1828/1561A model is presented in which sterile pests are released into a system consisting of a pest species with two life stages and a predator species. The release of steriles affects mainly predators and as the release rate is increased the predator equilibrium is eventually reduced to zero. In one case, however, a bifurcation exists and the system will collapse before the predators are eliminated.entechnical reports (mathematics and statistics)Technical ReportDepartment of MathematicsDepartment of Mathematics and Statistics