Abstract
Twenty clones showed nonhost reactions (R=<0.1) for race 1, and 13 were poor hosts (0.1<R<1.0) for race 2. Two clones were nonhosts to both races. The host reactions of excised roots of potato, tomato, and 13 clones of S. bulbocastanum to races of M. chitwoodi were also tested in monoxenic culture. The reproductive efficiencies of both races on host genotypes in pot vs. root culture were significantly correlated
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