VIEW ARTICLE

Ecology and Epidemiology

Interrelations Between Potato Virus X, Verticillium dahliae, and Colletotrichum atramentarium in Potato. J. J. Goodell, Graduate research assistant, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331; M. L. Powelson(2), and T. C. Allen(3). (2)(3)Assistant professor, and professor, respectively, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331. Phytopathology 72:631-634. Accepted for publication 27 August 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-631.

The association between potato virus X (PVX), Verticillium dahliae, and Colletotrichum atramentarium in potato was examined in two center-pivot-irrigated fields in the Columbia River Basin of north central Oregon. One field had been cropped to potatoes 4 of the past 5 yr and the other field had not been previously cropped to potatoes. Plant infection levels by PVX, V. dahliae, and C. atramentarium were monitored. PVX had no effect on the incidence of infection by V. dahliae, but in two of the three cultivar Russett Burbank seed sources tested, infection by PVX was associated with high populations of V. dahliae in the potato stems. This association was particularly pronounced in the field previously cropped to potatoes where the early dying disease was severe. Infection and stem colonization by C. atramentarium were inversely correlated with PVX infection.