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Breeding Low-Tannin Sericea. II. Effects of Rhizoctonia Foliar Blight on V1 igor and Seed Yields¹

Some low-tannin sericea lespedeza [Lespedeza cuneata (Dumont) G. Don] genotypes are highly susceptible to a foliar disease caused by Rhizoctonia sp., but effects of the disease on vigor and seed production have not been determined. Low-tannin lines were evaluated in field tests at three locations, and these varied from highly susceptible to highly resistant at each location. Some lines were rated as resistant at one location but susceptible at another, which suggests there may be multiple strains of the fungus. Disease severity was negatively correlated with vigor ratings, hay weights, and seed yields. Results indicated disease severity accounted for 27 to 30% of the variation in vigor and 22 to 29% of the variation in seed yields among locations. Resistant low-tannin germplasm was developed by crossing low-tannin plants with high-tannin plants that havea gene or genes for resistance.

Key Words: Lespedeza cuneata (Dumont) G. Don • Susceptibility • Resistance • Epiphytotic • High-tannin

² Professor of Crop.

Received for publication September 25, 1981.