Abstract

Screening in the seedling and first clonal generations is a potentially cost-effective and efficient way to incorporate resistance to important diseases and reduce large breeding populations to manageable size. In practice, however, early screening is often limited by the need to maintain clean seedstocks of promising clones, unreliability of single-plant evaluations, associations of disease resistance with undesirable horticultural characteristics, or the higher priority placed on traits other than disease resistance. Possible methods to overcome these limitations are discussed. Examples of early generation screening for resistance to several diseases are given.

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