Interrelations Between Potato Virus X,Verticillium dahliae,andColletotrichum atramentariumin Potato

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Abstract
The association between potato virus X (PVX), V. dahliae and C. atramentarium in potato was examined in 2 center-pivot-irrigated fields in the Columbia River Basin of north central Oregon [USA]. 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 in the incidence of infection by V. dahliae, but in 2 of the 3 ''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.