Abstract
In Pennsylvania apple orchards, control of Panonychus ulmi (Koch) is achieved by dinocap and the predator Stethorus punctum (LeConte). A decision-making table is proposed for determining the minimum number of S. punctum necessary to control a given sized European red mite population. This table is based on a mathematical model of the relationship between S. punctum populations and mite populations necessary for successful European red mite control. The parameters utilized in constructing this model were: the rate at which dinocap suppresses a mite population; the S. punctum predation rate; temperature and its effect on the rate of mite population growth; and the rate at which S. punctum populations increase.
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