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What should I do about the large numbers of black ants living in my mature pin oak tree?

April 26, 2017ants Black large Living Mature Numbers oak Pin tree

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What should I do about the large numbers of black ants living in my mature pin oak tree?

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These are most likely carpenter ants which indicate structural problems in large trees. They often build large nests in dead, rotting wood expelling sawdust near the affected sections. Consult a professional arborist. Removing the dead parts on your tree will probably control the ants.