Incidence of Aphanomyces euteiches and Phytophthora medicaginis in Kentucky Alfalfa Fields. P. VINCELLI, Department of Plant Pathology, University of Kentucky, Lexington 40546-0091. W. C. NESMITH, and B. C. ESHENAUR, Department of Plant Pathology, University of Kentucky, Lexington 40546-0091. Plant Dis. 78:645-647. Accepted for publication 4 February 1994. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1994. DOI: 10.1094/PD-78-0645.

Aphanomyces euteiches was detected in soil or root samples from fields cropped to alfalfa in 47 counties from most major alfalfa-producing regions in Kentucky. Soil samples from 121 fields in 30 counties were tested for the presence of A. euteiches and Phytophthora medicaginis using a baiting technique. A. euteiches and P. medicaginis were detected in 57 and 9.9%, respectively, of samples collected. Given the prevalence of alfalfas-infecting strains of A. euteiches, studies are needed to determine whether the use of Aphanomyces-resistant cultivars will result in enhanced performance of alfalfa in Kentucky.