Since 1976, the Predictive Extension Timing Estimator (PETE) model has been applied to 12 deciduous tree fruit pests and evaluated or used in 10 states in the United States. Applications for pests of other crops both nationally and internationally are under development. Estimated current benefits in using PETE models are 1.2 million per year in the 10 states, but benefits in the future are projected at 31 million/per year. Aspects of computer implementation, biological and environmental monitoring, personnel use, and future needs for PETE model developments and improvements are discussed.
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Croft et al. (1983) studied this question.