Disease Progress and Yield Loss in Aphanomyces Root Rot of Peas

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Abstract
The epidemiology of Aphanomyces root rot of pea was studied in field plots on sandy soil. The pathogen, Aphanomyces euteiches f. sp. pisi, can spread from an infected plant to a limited number of neighboring plants in the pea stand. In small field plots with soil infested at various inoculum levels, the disease incidence (percentage of plants infected) increased rapidly early in the season at high inoculum levels; at lower inoculum levels, the increase in disease incidence was similarly rapid, but occurred later in the season. Yield varied inversely with logarithm of soil inoculum level. The inoculum level of A. euteiches f. sp. pisi in soil decreased 50%/yr in the absence of a pea crop.