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Differential Interactions of Pratylenchus crenatus, P. penetrans, and P. scribneri with Verticillium dahliae in Potato Early Dying Disease. R. M. Riedel, Professor, Department of Plant Pathology, The Ohio State University (OSU), Columbus 43210; R. C. Rowe(2), and M. J. Martin(3). (2)Ohio Agricultural Research and Development Center (OARDC), Wooster 44691; (3)Research biologist, Agricultural Chemicals Department, E. I. du Pont de Nemours & Co., Inc., P.O. Box 30, Newark, DE 19714. Phytopathology 75:419-422. Accepted for publication 15 October 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/Phyto-75-419.

The interaction of Verticillium dahliae with Pratylenchus crenatus, P. penetrans, and P. scribneri in plants of potato cultivar Superior was tested in field microplots established on fumigated organic soil. Interactions of lesion nematodes and V. dahliae in potato early dying (PED) disease varied with nematode species. In 1982 and 1983, the highest tested population levels of P. penetrans and V. dahliae reduced tuber fresh weight 20 and 39%, respectively, and caused severe PED symptoms. P. crenatus did not interact with V. dahliae in either year of the tests. In 1982, P. scribneri did not interact with the fungus, but in 1983, this species and V. dahliae at high population levels caused PED symptoms and lowered tuber yield. The interaction of P. scribneri and V. dahliae in 1983 was correlated with high temperature stress during tuberization.