Interactions between Meloidogyne incognita, M. hapla, and Pratylenchus brachyurus in Tobacco

Authors

  • A. W. Johnson
  • C. J. Nusbaum

Abstract

I n a greenhouse pot experiment on the pathogenicity and interactions of Meloidogyne incognita, M. hapla and Pratylenchus brachyurus on four cultivars o f tobacco the cultivars 'Hicks' and 'NC 2326' were susceptible to each nematode and "NC 95' and 'NC 2512' resistant only to M. incognita. Mean heights of susceptible plants were depressed but fresh weight of tops did not differ significantly. Meloidogyne spp. increased fresh weight of susceptible (but not the resistant) roots. Reproduction of M. incognita was decreased in the presence of P. brachyurus in one case. M. hapla reproduction was less with either of the other nematodes in five out of eight cases. In 12 combinations involving P. brachyurus, reproduction of this species was depressed in seven, not affected in four and increased in one. Mechanisms involved in associative interactions were not identified but appeared to be indirect and to involve individual host-nematode responses. Key Words: Meloidogyne, Pratylenchus, Root-knot nematode, Lesion nematode, Nicotiana tabacum, Tobacco, Interaction, Mixed populations.

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Published

1970-10-15

Issue

Vol. 2, No. 4 (October 1970)

Section

Articles

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