Abstract
The effectiveness of 24 alleles from four Rp loci that condition race-specific resistance to common rust (Puccinia sorghi) in corn (Zea mays) was evaluated in field trials from 1987 to 1991 at many locations in eastern United States and one in central Mexico. In natural and/or inoculated epidemics, near-isogenic lines containing each gene were scored for the presence of susceptible-type uredinia. Only two genes (Rp 1 d and Rp 3 c ) were totally effective, with no large uredinia observed in any trial. Also, an unnamed gene from M165sel was totally effective during the 3 yr it was tested in St. Paul, Minnesota (.)
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