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Interaction of Corynebacterium michiganense and Meloidogyne incognita on Tomato. R. M. de Moura, Graduate Student, Department of Plant Pathology, North Carolina State University, Raleigh 27607, Present address of senior author: Escola Superior de Agricultura da Universidade Federal Rural de Pernambuco, Dois Irmaos, Recife, Pernambuco, Brazil; E. Echandi(2), and N. T. Powell(3). (2)(3)Professors, respectively, Department of Plant Pathology, North Carolina State University, Raleigh 27607. Phytopathology 65:1332-1335. Accepted for publication 9 June 1975. DOI: 10.1094/Phyto-65-1332.

An interaction involving Corynebacterium michiganense and root-knot nematode, Meloidogyne incognita, was observed under greenhouse conditions when C. michiganense was inoculated in the stem of tomato plants. M. incognita increased severity of bacterial canker on tomato cultivars Manapal and MR-4, canker-susceptible and resistant cultivars, respectively. No significant difference in bacterial canker severity was observed in Manapal and MR-4 when inoculated with M. incognita simultaneously or 10 days prior to inoculation with C. michiganense. No increase in disease severity was observed on bacterial-canker-resistant Lycopersicon hirsutum (P.I. 251305) when inoculated with both pathogens. C. michiganense had no effect on reproduction of M. incognita.

Additional keywords: bacterial canker, root-knot nematode.