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Screening Sainfoin for Resistance to Root and Crown Rot Caused by Fusarium solani (Mart.) Appel and Wr.¹

Root and crown rot drastically decreases persistence and forage yield of sainfoin (Onobrychis viciifolia Scop.). We evaluated four techniques of inoculating sainfoin with Fusarium solani (Mart.) Appel and Wr, a cause of root and crown rot, for the purpose of locating resistant germplasm. Techniques evaluated included the rootcut-soak, crown injection, aerial spray, and toothpick insertion methods of inoculation. The root-cut-soak inoculation technique applied to 6-week-old sainfoin seedlings resulted in 77% seedling infection, produced the most severe disease symptoms, and had low seedling mortality from physical injury to the seedlings. This inoculation technique gave repeatable results and detected differences in disease resistance among genotypes. The root-cut-soak inoculation technique was used to screen 181 accessions of the world collection of Onobrychis for sources of resistance to root and crown rot. The accessions and the 11 species which they represent exhibited differential disease resistance, but none was immune to the disease.

Key Words: Disease resistance • Inoculation techniques • Onobrychis viciifolia Scop.

² Former graduate research assistant, Plant and Soil Science Dep., Montana State Univ., currently assistant professor, Plant and Soil Science Dep., Univ. of Idaho, Moscow, ID 83843. Assistant professor, Plant and Soil Science Dep., and professor, Plant Pathology Dep., Montana State Univ., Bozeman, MT 59715, respectively.

Received for publication May 17, 1976.