Anastomosis group identity and virulence of Rhizoctonia solani isolates collected from potato plants in Alberta, Canada
1995
Bains, P.S. | Bisht, V.S.
Of 64 isolates of Rhizoctonia solani collected from potato plants grown in central and southern Alberta, 49 belonged to AG-3, and seven each to AG-4 and AG-5. One isolate did not anastomose with any of the tester cultures (AG-2-1, AG-3, AG-4, AG-5, and AG-9) used. In vitro radial growth rate of AG-3 isolates, as a group, was significantly slower than that of AG-4 and AG-5 isolates. Growth rates of AG-4 and AG-5 were similar. Members of AG-3, AG-4, and AG-5 were not restricted to any particular geographical region of the province, and occurred on infected plants growing in the same field. As a group, AG-3 isolates were significantly more virulent than AG-4 and AG-5 isolates, whereas virulence of AG-4 and AG-5 isolates was similar. The high incidence and virulence of AG-3 isolates indicate that AG-3 is the major cause of Rhizoctonia disease of potato in Alberta, whereas AG-4 and AG-5 are of minor importance.
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