Variation in Pathogenicity of Seventeen Isolates of Meloidogyne incognita.
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.
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