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Influence of Endogone Mycorrhiza on Phytophthora Rot of Soybean. J. P. Ross, Plant Pathologist, Plant Science Research Division, ARS, USDA, P. O. Box 5397, Raleigh, North Carolina 27607; Phytopathology 62:896-897. Accepted for publication 18 February 1972. DOI: 10.1094/Phyto-62-896.

Internal stem discoloration developed on 88% of Phytophthora rot-susceptible soybean plants growing in a sandy loam soil infested with Phytophthora megasperma var. sojae and a chlamydosporic species of Endogone, and 33% of the plants died. In plots infested with Phytophthora alone, 17% of the plants developed internal stem discoloration, but none died. Endogone had no effect on Phytophthora rot symptoms on a more disease-tolerant cultivar.