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Disease Reaction of Thirty Sources of Cytoplasmiic Male-Sterile Corn to Helminthosporium Maydis Race T¹

Thirty source of cytoplasmic male sterile (cms) corn (Zea mays L.) were evaluated for their disease reaction to H. maydis race T. Plants with cms-B, -C, -CA, -D, -EK, -F, -G, .H, -I, -IA, "J, -K, -L, -M, -ME, -ML, -MY, -PS, -R, -RB, -S, -SD, -TA, -VG, and -W designations were resistant. Four sources, cms-HA, -P, -Q, and -T, were susceptible. Differences in disease reaction were observed on seedlings in the form of lesion type and on field-grown adult plants in the form of lesion type and lesion number.

Key Words: Southern corn blight

² Assistant Plant Pathologist, Professor, Research Associate, University of Illino;is, Champaign-Urbana;n d Geneticist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, University of Missouri, Columbia, respectively.

Received for publication April 14, 1971.