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Evaluating the Breeding Potential of Inbred Lines of Corn Resistant to the Leaf Blight Caused by Helminthosporium Turcicum¹

Synopsis: Thirty blight resistant inbred lines differed significantly in their blight reaction as lines, in their reaction in crosses with 3 susceptible tester lines, and in the performance of the F₂ progenies from these crosses. There also were highly significant differences in blight reaction among the 3 testers and for the interaction of lines x testers, both for the F₁ crosses and for the F₂ progenies. Lines identified as superior breeding sources of resistance were GE440, CI.90A, CI.93A, and Wh4971, with CI.86A, CI.28A, and Kyll4 also showing good promise.

² Agronomist and Pathologist, CRD-ARS, USDA. The writers are grateful to E. J. Koch and W. D. Hanson, Biometrical Services, ARS, for suggestions and guidance in experimental design and statistical treatment of the data, and to V. E. Green, Jr., Everglades Experiment Station and W. J. Wiser, CRD, ARS, for personally supervising the growing of the experiments in 1956 and 1957, respectively.

Received for publication May 26, 1958.

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