Stability of Resistance of Potato to Strains ofVerticillium dahliaefrom Different Vegetative Compatibility Groups

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Abstract
Potato clone A66107-51 was resistant to a range of potato strains of V. dahliae. These included strains from three vegetative compatibility groups, P1, P3, and P4. Resistance was determined by symptom expression and colonization of stems under greenhouse conditions. The wilt-susceptible cultivar Russet Burbank was very susceptible to strains from compatibility group P4, moderately susceptible to a strain from group P3, and not susceptible to a strain from group P1 and an unclassified strain. The Verticillium wilt resistance of clone A66107-51 was not affected by the vegetative compatibility group or geographic origin of V. dahliae strains.

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