Adaptability of Strains of Subclover to Alabama Conditions

OLLOWELLI reported that about 15 varieties of subclover have H been tested in the Southeastern states and Mt. Barker and Tallarook were found best adapted to this region. Rampton2 described strain adaptions in Oregon, but no reports were found of strain differences in susceptibility to mildew. Reseeding ability, comparative earliness, and disease resistance of four strains of subclover, Trifolium subterraneum L., were studied in plantings on Susquehanna Clay on the Tuskegee Experiment Field in central Alabama. These seedings were made in September, 1945, and a marked difference in resistance to powdery mildew was observed the following spring. The Dwalganup strain matured early and died in April. The Bacchus Marsh strain approached maturity and was white with mildew about May I, while the Mt. Barker strain showed only slight mildew. At that time Tallarook was growing vigorously and appeared completely resistant to the disease. There did not appear to be much difference in time of maturity of the Mt. Barker and Tallarook strains.