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What causes holes in the trunk of my aspen tree?
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Borers. Many kinds of boring beetles attack aspen trees. Trees that are stressed are more susceptible to borer infestation. Developing larvae burrow into the trunk and feed sometimes for several years. Borer wounds often bleed and their tunneling weakens the trunk of the tree and may cause the invasion of fungi. Maintain your trees’ health to prevent borer infestation. Once the borer larvae is inside the heartwood, insecticide applications are futile.
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