Bronze birch borer larvae feed under the bark.

• A. Under the bark
• B. In the canopy
• C. In the roots
• D. In the fruit

Answer: (A)

Bronze birch borer larvae feed under the bark, in the layer between the inner bark and the wood where the phloem and cambial tissues are located. This under-bark feeding lets them create winding galleries that disrupt nutrient and water transport, girdling the tree and weakening or killing it over time. You can recognize the problem by symptoms on the birch canopy and by D-shaped exit holes on the bark where adults emerge. They don’t feed in the canopy, roots, or fruit, since the larval stage is specifically a wood-borer living just beneath the bark.