What insects attack Sitka spruce?

Sitka spruce, a valuable tree species in both timber production and ecological systems, is particularly susceptible to a range of insect pests that can cause significant damage. Pinhole borers, which include various species of wood-boring beetles, typically attack the inner layers of the bark and wood, creating small entry holes that can compromise the tree’s structural integrity and health. Jewel beetles, known for their metallic coloration, also have larvae that bore into the wood of the spruce, leading to further degradation of the tree.

Understanding the specific pests that affect Sitka spruce is crucial for implementing effective management strategies. The presence of both pinhole borers and jewel beetles signifies a two-fold threat to the health and longevity of the spruce, highlighting the need for monitoring and potentially controlling these pest populations to protect the trees.

The other options mentioned include various other insect types, but they do not specifically target Sitka spruce in the same manner as pinhole borers and jewel beetles, making the combination of these two pests particularly relevant to the question.