Ecological Races of Helminthosporium maydis Race T

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Abstract
A cool-environment population and a warm-environment population of H. maydis race T [southern corn leaf blight pathogen] were evaluated for virulence, infection efficiency and sporulation efficiency under cool and warm temperature regimes. Each population was superior to the other in an environmental regime comparable to its native habitat. Infection and sporulation efficiencies were greater for the cool-environement population under the cool regime and greater for the warm-environment population under the warm regime. Infection and sporulation efficiencies of the 2 populations were similar after continued exposure to a cool or a warm temperature regime, apparently due to selection for subpopulations that were better able to persist under those regimes.

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