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Criconemoides xenoplax Experimentally Associated with a Disease of Peach. B. F. Lownsbery, Department of Nematology and Plant Pathology, University of California, Davis 95616; Harley English(2), E. H. Moody(3), and F. J. Shick(4). (2)(3)(4)Departments of Nematology and Plant Pathology, University of California, Davis 95616. Phytopathology 63:994-997. Accepted for publication 15 February 1973. DOI: 10.1094/Phyto-63-994.

Ring nematodes, Criconemoides xenoplax, added to ‘Carolyn’ peach on ‘Lovell’ rootstock at planting time, reduced growth of the trees and increased susceptibility to both Pseudomonas syringae and waterlogging. The full effect of the nematodes was evident only after three growing seasons. Addition of Pythium spp. at planting time increased susceptibility to P. syringae less than did inoculation with C. xenoplax. Pythium spp. did not reduce growth of peach trees significantly. No interaction between C. xenoplax and Pythium spp. was noted.

Additional keywords: bacterial canker, Prunus persica.