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Attacks and kills large numbers of pine trees, altering forest composition and impacting the lumber industry.

Feeds on fir trees' sap, causing defoliation, reduced tree growth and eventually tree death, with impacts on forestry.

Causes widespread ash tree mortality, leading to economic losses in timber and reduced biodiversity.

Destroys pine forests by boring into the bark, leading to loss of timber resources and habitat.

Feeds on sap, weakening and potentially killing hemlock trees and impacting ecosystems reliant on hemlocks.

Defoliates a wide variety of trees, which can lead to tree death and affect forest health and lumber production.

Borers tunnel into eucalyptus, weakening the trees, increasing susceptibility to fall, and reducing timber value.

Damages a wide range of hardwood trees by boring into the wood, disrupting water and nutrient transport.

Stunts growth by boring into new shoots; widespread infestations can reduce wood quality and vigor of trees.

Feeds on the leaves and bark of a variety of trees, resulting in defoliation, growth reduction, and aesthetic damage.

Introduces a symbiotic fungus as it lays eggs, which can kill pine trees and has economic implications on forestry.

Destroys Douglas-fir trees by tunneling under the bark, disrupting nutrient flow and causing death of the trees.

Defoliates spruces and firs leading to growth loss and tree mortality, affecting timber and pulp industries.

Kills birch trees by disrupting water and nutrient transport, affecting ornamental value and ecosystem health.