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Committee recommends monitoring pin oak with galls at 139 Upper Main; treatment only if health declines

Nantucket Tree Committee · February 18, 2026
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Summary

Committee examined a pin oak at 139 Upper Main that has oak galls. Members said galls are usually cosmetic and the tree appears healthy; they recommended waiting until leaf-out to reassess and exploring injections or third-party treatment if needed.

Committee members reviewed a citizen concern about a pin oak at 139 Upper Main that is exhibiting oak galls.

Ben, a committee member, said galls are typically cosmetic and suggested the tree's health did not warrant removal or immediate invasive treatment: "They're typically cosmetic if the tree is healthy," he said. Members recommended waiting until leaf-out to reassess and, if treatment is needed, to consider systemic injections or hiring a contractor to treat the tree rather than removing it.

The committee concluded the oak is healthy overall and that observation into the growing season is the appropriate next step; Dale (not present) had previously discussed the tree and was not inclined to remove it solely because of galls.