Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 14:594-595 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Mutual Balance Between Tester Resistance and Isolate Virulence in the Evaluation of Corn Inbreds for Diplodia Stalk Rot1

James D. Maxwell and D. L. Thompson2

Fifty inbred lines of corn (Zea mays L.) in crosses with two single-cross testers (one relatively resistant, the other susceptible) were inoculated with two isolates of Diplodia zeae (Schw.) Lev. (one highly virulent, the other weakly virulent) and rated for stalk rot. Significant differences among testcrosses were obtained for two combinations: resistant tester-highly virulent isolate and susceptible tester-weakly virulent isolate. The results indicate that mutual balance between genotype resistance and isolate virulence can be important for proper discrimination among genotypes.

Key Words: Stalk lodging • Stalk quality

1 Cooperative investigations of the Southern Region, ARSUSDA and the North Carolina Agricultural Experiment Station, Raleigh, North Carolina. Published with the approval of the Director of Research as Paper No. 3981 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, North Carolina. (Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree).

2 Formerly, Graduate Research Assistant, Department of Crop Science, North Carolina State University (now Associate Professor of Agronomy and Soils, Clemson University, Clemson, SC29631); and Research Agronomist, ARS-USDA, Raleigh, NC27607.

Received for publication June 15, 1973.




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Environmental Quality		 The Plant Genome
Copyright © 1974 by the Crop Science Society of America.