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(...) Sporulation in leaflets and tuber disks was poorly correlated, while infection frequency was correlated (r=0.56) with sporulation in leaflets. The MR group of isolates had a significantly higher compound fitness index compared with the MS group of isolates in foliage of the potato cultivars tested. This higher fitness, however, did not render the foliage resistance of some cultivars ineffective
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David Kadish (1990) studied this question.
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