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Failure of Root-knot Nematode to Affect Fusarium Wilt Resistance of Tomato. John Paul Jones, Professor of Plant Pathology, Agricultural Research and Education Center, Bradenton, FL 33505; A. J. Overman(2), and P. Crill(3). (2)Professor of Nematology, Agricultural Research and Education Center, Bradenton, FL 33505; (3)Senior Plant Breeder, Petoseed Research Center, Saticoy, CA 93003. Phytopathology 66:1339-1341. Accepted for publication 30 April 1976. Copyright © 1976 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-66-1339.

Manapal (resistant to race 1 and susceptible to race 2 of Fusarium oxysporum f. sp. lycopersici) and Florida MH-1 (resistant to both races) tomato seedlings were either (i) root-dip-inoculated with either race 1 or 2 and transplanted into soil infested with root-knot nematode larvae (Meloidogyne incognita), or (ii) inoculated first with root-knot nematodes and 2 weeks later with either race 1 or 2. All nematode-inoculated plants were moderately galled. Manapal seedlings inoculated with race 1 and nematodes did not succumb to Fusarium wilt, but developed severe wilt when inoculated with race 2 with or without nematodes. Florida MH-1 seedlings did not develop Fusarium wilt whether inoculated with race 1 or 2 either with or without nematodes. Therefore, it was concluded that root-knot nematodes, whether applied simultaneously with the Fusarium inoculum or 2 weeks prior to the Fusarium inoculum, did not reduce the resistance of Manapal to race 1, nor the resistance of Florida MH-1 to race 1 or 2.

Additional keywords: Fusarium oxysporum f. sp. lycopersici, Lycopersicon esculentum, Meloidogyne incognita.