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Frequency distribution of disease severity classes in populations 41 (A), 51 (B), 81 (C), and 91 (D) from 2013 greenhouse evaluations. The resistant parent line W04–1002 showed a highly resistant rating of 0.1 while the average rating of other parental lines was 3.0 for W04–571, 4.0 for W04–680, 3.5 for L84–5873, and 3.8 for LN89–5717.
