... and with thoughtful cross-breeding between RB's and RR's, with attention and emphasis on RR's and seedling evaluation for performance over time, a helpful variety of genetics is preserved and kept available in the tool kit useful against present and future rust strains. I sometimes find that partially resistant breeding parentage has resulted in sustained and remarkable improvements to resistance in a number of generations of offspring. Just my own take on practical observational information, and my own "secret recipe" for what to cross with what, but similar to what is found in other breeding programs where a super parent may still show some slight lack, but where offspring invariable are found to have picked up a more helpful mix of genes.
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