FREQUENCY AND DISTRIBUTION OF SEEDBORNE FUNGI INFECTING CANOLA SEED FROM ONTARIO AND WESTERN CANADA - 1989 TO 1993

摘要

From 1989 to 1993, composite samples of canola from crop districts in western Canada and, from 1991 to 1993, individual producer samples of canola from Ontario were tested for the presence of seedborne fungi. Each year, 600 seeds from each western crop district and between 150 and 300 seeds from each Ontario sample were surface disinfected before plating onto 20% V-8 agar. Seventy species representing 36 genera were recovered. Alternaria alternata was the most common species recovered, followed by Alternaria brassicae and Alternaria raphani. The frequency with which Alternaria alternata was recovered from seed was higher in samples from the more easterly provinces, whereas that of Alternaria brassicae and Alternaria raphani were highest in samples from the more westerly ones.