Abstract
(...) Both pathogens caused root discoloration and chlorosis of cotyledons, followed by advancing stem necrosis. Disease incidence was equivalent for seedlings incubated at 16-18 C. However, optimal temperatures for disease were 24-28 C and 16-28 C for A.e. and P. m. medicaginis, respectively. Alfalfa cultivars Vernal and Apollo II are susceptible to A.e., and Apollo II is resistant to P. m. medicaginis. Vernal reacted with higher disease ratings and greater area under a mortality progress curve than Apollo II when inoculated with either pathogen. However, the difference between cultivars was greatest against P. m. medicaginis at 16 and 20 C
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