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Aeroponics Chambers for Evaluating Resistance to Aphanomyces Root Rot of Peas (Pisum sativum). A. RAO, Graduate Research Assistant, University of Wisconsin-Madison, Madison 53706. E. T. GRITTON, Professor, Department of Agronomy; C. R. GRAU, Professor, Department of Plant Pathology; and L. A. PETERSON, Professor, Department of Horticulture, University of Wisconsin-Madison, Madison 53706. Plant Dis. 79:128-132. Accepted for publication 4 November 1994. Copyright 1995 The American Phytopathological Society. DOI: 10.1094/PD-79-0128.

An aeroponics system was used for evaluating resistance of peas to Aphanomyces euteiches. Five pea genotypes were tested for resistance to two isolates of A. euteiches at concentrations of 0 to 10,000 zoospores per milliter. Pea genotypes reacted differently to isolates of A. euteiches. Genotype 86-2231 demonstrated the lowest amount of disease and Dark Skin Perfection the highest. Isolate 467 produced consistently higher disease scores than isolate FBI. Inoculum concentration and isolate x concentration effects were significant. This study provides evidence that an aeroponics system can be useful in evaluating the reaction of peas to A. euteiches.