Fig. 2 (a) Rust susceptibility and mean grain yield of 41 maize hybrids and two commercial checks in two tropical highland environments, 1993. Disease rating scale 1 to 5, where 1 = highly resistant and 5 = highly susceptible. (b) Smut susceptibility and mean grain yield of 41 maize hybrids and two commercial checks in two temperate environments, 1993. Disease rating scale 0 to 3, where 0 = no symptoms and 3 = all plants with symptoms on the ear and on the stem

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