The downy mildew, Peronospora trifoliorum deBy. of alfalfa, Medicago sativa L., is a widespread disease occurring in almost all countries of the world where alfalfa is grown. This disease assumes importance in the middle-west during wet seasons, particularly in the spring and fall. In Iowa it is most destructive on fall seedings and on the first cutting in the spring. The present studies were undertaken to throw light on the relation of moisture and temperature to spore germination and infection, the possible host range of the downy mildew, and its method of overwintering.
Proceedings of the Iowa Academy of Science
©1929 Iowa Academy of Science, Inc.
Melhus, I. E. and Patel, M. K.
"Study of Peronospora trifolioum Debary on Species of Leguminosae,"
Proceedings of the Iowa Academy of Science, 36(1), 113-119.
Available at: https://scholarworks.uni.edu/pias/vol36/iss1/19