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How do bark beetles affect pine trees?
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pine
A stand of stone pines (Pinus pinea) in Doñana National Park near Seville, Spain.
Bark beetles, particularly species within the genera Dendroctonus and Ips, are among the most destructive insects affecting pine trees.12
These beetles impact trees through the following process:
- Boring and Feeding: Adult beetles bore into the tree and feed just beneath the bark.1
- Gallery Formation: They create egg chambers and tunnels, known as galleries, where females deposit eggs. After hatching, the larvae continue to bore away from the chamber, creating a characteristic series of tunnels.2
- Disruption of Nutrients: These tunnels disrupt the tree's ability to transport food to its roots.1
- Tree Mortality: The cumulative damage from these activities often kills the tree.1
While healthy forests are generally more resistant to infestation, overmature, weak, or damaged trees are particularly susceptible. In some cases, these beetles may also transmit plant diseases to the trees they attack.12