Abstract
SummarySix hypovirulent (H) strains of Cryphonectria parasitica collected in Italy were tested for dsRNA content, virulence, and conversion ability. Nine converts were also checked for dsRNA. In inoculation trials, H and converted (C) strains showed reduced pathogenicity. Most H and C strains were able to convert strains from various v‐c groups. DsRNA banding patterns were similar in five of the H strains and in their converts, while the last one and its converts showed no evidence of dsRNA. The broad conversion ability of H strains seems to be responsible for the natural recovery of Italian chestnut trees.
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