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Field Tolerance in Alfalfa to Sclerotinia Crown and Stem Rot¹

Alfalfa (Medicago sativa L.) cultivars and experimental lines were evaluated in two replicated field tests for Sclerotinia crown and stem damage caused by natural infection. In both experiments the amount of damage that occurred in the entries differed significantly. When the disease was most severe, the amount of damage among entries ranged from 2 to 30%. The results of the two field experiments were consistent (r = 0.87, 11 d.f.). A diseasetolerance reaction that was observed in the field was not found in greenhouse experiments. Differences in field tolerance may have been related to the degree of general adaptation of the cultivars and lines to the test location and to subtle differences in susceptibility to initial infection.

Key Words: Sclerotinia sclerotiorum • Sclerotinia trifoliorum • Forages

² Research plant pathologist and research geneticist, respectively, Southern Region, USDA-ARS, and the departments of Plant Pathology and Crop Science, respectively, North Carolina State Univ., Raleigh, NC 27607.

Received for publication October 19, 1977.