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Frequency of Progenies Resistant to Corn Stunt and Maize Dwarf Mosaic in Maize Populations¹

S₁ progenies from 10 maize (Zea mays L.) populations were evaluated for reaction to maize dwarf mosaic virus following manual inoculation and to the corn stunt agent(s) under conditions of natural infection, respectively. All populations except one had at least some progenies showing some resistance to maize dwarf mosaic (MDM), but there were differences among the populations. ‘Kenya Composite’ and ‘PR-Mpl’ had the greatest frequency of progenies highly resistant to MDM. Heritability estimates for MDM resistance within the populations tested ranged from 0.21 to 0.85. ‘Corn Belt’ x ‘Brazilian Synthetic No. 1,’ ‘Corn Belt x Mexican Synthetic No. 1,’. and PR-Mpl had higher numbers of progenies resistant to corn stunt (CS) than the other populations tested. Heritability estimates for CS resistance within the populations tested ranged from 0.03 to 0.59. The greatest expected progress for improvement of CS resistance would be in Kenya Composite. Index selection based on the "total score" for both diseases was an efficient method of selecting parents to be used for population improvement for resistance to both diseases.

Key Words: Corn • Zea mays L. • Insect-transmitted diseases • Recurrent selection

² Research agronomist and research plant pathologist, respectively, ARS, USDA.

Received for publication July 1, 1974.