Peter C. Ellsworth

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Previous researchers using between-subjects comparisons have found eyewitness confidence and accuracy to be only negligibly correlated. In this study, we examined the predictive power of confidence in within-subject terms. Ninety-six subjects answered, and made confidence ratings for, a series of questions about a crime they witnessed. The average(More)
Fifty years ago, Stern, Smith, van den Bosch and Hagen outlined a simple but sophisticated idea of pest control predicated on the complementary action of chemical and biological control. This integrated control concept has since been a driving force and conceptual foundation for all integrated pest management (IPM) programs. The four basic elements include(More)
Until 1994, testing of 'Bt' cotton varieties was confined to the variety, Coker 312. This variety is not particularly suitable for low desert cotton production. Over the past 4 years, we have demonstrated the performance of the 'Bt' gene (i.e., Bollgard™ gene by Monsanto) in this cotton variety under Arizona conditions. Recommendations on how to scout and(More)
BACKGROUND Many polyphagous pests sequentially use crops and uncultivated habitats in landscapes dominated by annual crops. As these habitats may contribute in increasing or decreasing pest density in fields of a specific crop, understanding the scale and temporal variability of source and sink effects is critical for managing landscapes to enhance pest(More)
The three keys to whitefly management are sampling, effective chemical use, and avoidance. This study examines factors relevant to the latter two keys in the context of Arizona's cotton pest spectrum. Insect growth regulators (IGRs) are central to Arizona's success in whitefly management. The basic usage guidelines developed for the IGRs—initial treatment(More)
Changes in insecticide use, available pest control technologies, and local crop ecology together with severely depressed cotton prices place a renewed premium on Lygus control decision aids for Arizona cotton. As part of an ongoing program to develop research-based Lygus management recommendations, we investigated the impact of various timings of chemical(More)
Direct-observation studies were conducted in replicated experimental plots to identify causes and estimate rates of mortality of whiteflies in cotton over the course of six generations from late June through late October. In plots receiving no whitefly or Lygus insecticides, predation and dislodgment were major sources of egg and nymphal mortality, and(More)