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Interactions between fusarium oxysporum f sp tracheiphilum and meloidogyne spp in vigna unguiculata 3. pathogenesis by fusarium oxysporum tracheiphilum as affected by meloidogyne javanica and host cultivar

Interactions between fusarium oxysporum f sp tracheiphilum and meloidogyne spp in vigna unguiculata 3. pathogenesis by fusarium oxysporum tracheiphilum as affected by meloidogyne javanica and host cultivar

Plant Pathology (Oxford) 40(3): 465-475

ISSN/ISBN: 0032-0862

Experiments were conducted to determine the temporal and spatial effects of Meloidogyne javanica and host cultivar on pathogenesis by Fusarium oxysporum f. sp. tracheiphilum in cowpea. In the wilt-susceptible cowpea cultivar California Blackeye No. 5 (CB5), F. o. tracheiphilum proliferated rapidly in both the hypocotyl and first internode 6 weeks after inoculation. The fungus spread quickly upward as plants grew, colonized most tissues within 6 weeks and caused severe wilt. In wilt-resistant cultivar CB3, there was little proliferation of F. oxysporum in any tissue, whether or not plants were infected by M. javanica. The fungus was found above the primary internode in 15% of all CB3 plants, but did not continue to spread upward after 4 weeks. Vascular discoloration was greatest when M. javanica was added 4 weeks before F. o. tracheiphilum, but simultaneous inoculation also increased wilt symptoms. Root wounding did not increase wilt. Split-root experiments provided no evidence that infection by M. javanica results in a translocatable factor that reduces wilt resistance. When hypocotyls were inoculated with F. o. tracheiphilum at different intervals after roots infected by M. javanica were removed, there was no evidence that the effect of the nematode on wilt susceptibility was translocated or persistent.

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Interactions between Fusarium oxysporum f.sp. tracheiphilum and Meloidogyne spp. in Vigna unguiculata. 3. Pathogenesis by F. o. tracheiphilum as affected by M. javanica and host cultivar. Plant Pathology 40(3): 465-475, 1991

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