Understanding Tree Pests: Key Threats to Our Forests

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Invasive pests such as the Asian Longhorn Beetle, Emerald Ash Borer, Gypsy Moth, and Western Pine Beetle threaten our forests. The Asian Longhorn Beetle, native to China, infiltrated the U.S. via infested packing materials. The Emerald Ash Borer has decimated over 20 million trees in Michigan, Ohio, and Indiana, leading to firewood quarantines to curb infestations. Gypsy Moths, introduced in 1870, mainly defoliate oaks and aspens, while the Western Pine Beetle targets Ponderosa and Coulter pines, primarily in the western states.

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May 05, 2026

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Understanding Tree Pests: Key Threats to Our Forests

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Tree Pests Creatures That Bug Our Trees Blaine Bottolfson Botany 202
Asian Longhorn Beetle • Native to China • Transported to United States in infested packing material
Emerald Ash Borer • Killed 20 million trees in Michigan, Ohio, and Indiana • Firewood quarantines to prevent new infestations
Gypsy Moth • Spread to U.S. in 1870 • Oaks and Aspens are most common hosts • Larva defoliate trees • Small mammals and birds are predators
Western Pine Beetle • Infest Ponderosa and Coulter pine trees • Mainly Western States • Tree loss considered normal ecological process
Acknowledgements • Photos and information courtesy of the USDA Forest Service • forestry.about.com