Nectria canker

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Crystal Floyd

Nectria canker most commonly occurs on maple and honey locust, but can also infect apple, aspen, basswood, birch, elm, oak, walnut, and other hardwood trees. The fungus Nectria galligena causes target-like cankers on many hardwoods (Fig. 1), while N. cinnabarina causes similar cankers on honey locust (Fig. 2).

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