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Influence of Pratylenchus brachyurus on the Incidence of Fusarium Wilt in Cotton. R. E. Michell, Graduate Assistant, Department of Plant Pathology, University of Illinois, Urbana 61801; W. M. Powell, Associate Professor, Department of Plant Pathology, University of Georgia, Athens 30601. Phytopathology 62:336-338. Accepted for publication 19 October 1971. DOI: 10.1094/Phyto-62-336.

Inoculation of Fusarium wilt-susceptible and -resistant cotton cultivars with Pratylenchus brachyurus and Fusarium oxysporum f. sp. vasinfectum alone and in combination with each other, resulted in wilting of the susceptible, but not the resistant, cultivar. A greater percentage of the plants wilted when the nematode and fungus were applied simultaneously than when the nematode was added 2 weeks prior to the fungus or when the fungus alone was used. Fusarium was isolated from all plants of both cultivars treated with the fungus, but colonization was most extensive in plants simultaneously treated with the nematode-fungus combination. Pratylenchus brachyurus reproduced on both cultivars of cotton, and populations were significantly higher on the susceptible cultivar when the nematode and fungus were applied at the same time.

Additional keywords: Gossypium hirsutum L., nematode-fungus interaction.