Early selection

The accumulation of horizontal resistance in the African maizes clearly involved early selection (see 7.7), and we conclude that early selection is effective in open-pollinated crops that are cultivated in a heterozygous condition. This comment involves crops such as maize, rye, millets, and sorghum, and crops of the onion, cucumber, and cruciferous families. It also includes crops that are normally cultivated as clones. But self-pollinated crops, cultivated as pure lines, should usually be subjected to late selection (i.e., selection in a near-homozygous state).

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