Based on several years of study on cereal aphids infesting winter wheat in the Southern Plains, when the percentage of aphids parasitized exceeds 20% (a parasitism threshold), aphid populations do not continue to increase and are quickly reduced. This research led to the development of a binomial sequential sampling procedure that determines whether the parasitism threshold has been reached by counting the frequency of wheat tillers with one or more mummified (parasitized) aphids. In this initial study, aphid intensity as estimated by existing binomial sequential sampling procedures, exceeded economic thresholds in only one field (by 1 aphid per tiller) when predicted to remain below. This presence-absence method of classifying levels of parasitism was deemed effective for predicting population suppression of aphids in winter wheat, however, the sampling plan was initially evaluated on a small number of fields in Oklahoma. Because of the potential usefulness of this sampling method for preventing unnecessary insecticide applications, it is very important that the plan is validated on a larger number of wheat fields throughout the region. We discuss additional validation data and error rates associated with this sampling approach. Additionally, data on the efficiency of this sampling approach and profitability of using curative insecticides will be discussed.