Population Models on the Release of Chemosterilants for Pest Control

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Abstract
Models are presented for determining the feasibility of population control by releasing sterilants and pesticides, singly or in combination, into the environment. Only the effects on the population equilibria were determined. For a single species with a simple life-cycle, the release of sterilants or pesticides would reduce population size, singly or in combination. For a single species with a 2-stage life-cycle, the release of sterilants or pesticides would usually reduce numbers, but their effects could be antagonistic. A pest species in competition with another species would usually decrease in response to sterilant or pesticide releases unless the competitor species is numerically dominant and competes strongly with the pests. A pest species limited mainly by predation will usually increase with sterilant or pesticide releases unless the predators are strongly crowded. A pest species limited by both predation and competition is unlikely to decrease with the release of pesticides or sterilant release if its birth rate is lower than that of the competitors or if the competitors exert little depressing effect on the pests.