Preliminary study on damping-off of cicer milkvetch in Southern Alberta.
Fungal isolates collected from cicer milkvetch (Astragalus cicer) with damping-off symptoms in Alberta, Canada, included Pythium group G, Pythium ultimum var. ultimum, P. salpingophorum and Fusarium spp. In inoculation tests, some isolates of Pythium group G and P. irregulare were highly virulent to A. cicer, and isolates of P. salpingophorum were weakly virulent. Some of Pythium group G and P. irregulare isolates which were virulent to A. cicer were also virulent on lucerne. Pythium group G from A. cicer was also virulent on A. adsurgens, safflower and peas. None of the Fusarium isolates was highly virulent to A. cicer. It is concluded that the predominant pathogen causing damping-off of A. cicer was Pythium group G.