For about a month now, I’ve been getting queries about oak trees exfoliating. That’s science talk for “the bark’s coming off.” Last year I had lots of calls on this and went with two specialists from the Forest Service to visit several sites. We were concerned about Hypoxylon canker, a fungal disease of trees and all trees were fine except one. Sometimes the shedding has been associated with a large number of caterpillars on the trunk, and I surmised woodpeckers were flaking off the bark to get to the lunch line. But caterpillars are not always involved.
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