Abstract
The pathogenicity of Phoma medicaginis var. medicaginis to crowns of alfalfa was determined by inoculating clonal and seedling plants of the cultivar Iroquois with two isolates of the pathogen. Crowns and stubble were inoculated. Crown inoculations with either isolate of P. m. medicaginis caused a black necrosis that extended up into stem bases through one internode and down into upper taproots and occasionally into lateral roots. Wounding of crowns was necessary for infection. Stem stubble provided a suitable infection court for the pathogen to invade crown tissues (.)
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