Variation in Pathogenicity of Seventeen Isolates of Meloidogyne incognita

C. J. Southards, M. F. Priest


Pathogenicity of 17 isolates of Meloidogyne incognita collected in Tennessee was studied in the greenhouse on: Rutgers tomato, N.C. 95 tobacco, McNair 1032 cotton, Dixie Queen watermelon, California Wonder pepper and line M57-13N cowpea. Root-knot indices of the isolates on the different hosts differentiated six physiological races. The host reactions of each race are discussed. Key words: host-parasite relations, physiological races.

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