Emerald ash borer, or EAB, is an invasive beetle that infests and kills ash trees. EAB has killed hundreds of millions of ash trees in the eastern United States. In 2022, EAB was confirmed in Oregon.
EAB threatens whole habitat types that are dominated by Oregon ash, including sensitive riparian zones. This pest has proven deadly to all ash species in North America and Europe.
Oregon can't eradicate emerald ash borers, but we are working to slow their spread by removing infested trees before larvae emerge.
OSU Extension gathered key emerald ash borer resources below.
Latest information
Recommendations
Identification resources
Oregon State University Extension Service
Oregon ash: Insects, pathogens and tree health
© 2023 Oregon State University. Extension work is a cooperative program of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)
Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.
Oregon State University Extension Service
Monitoreo y Detección de Plagas Forestales en Oregon: El barrenador esmeralda del fresno (EAB)
© 2017 Oregon State University. Extension work is a cooperative program of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)
Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.
Prevention and planning
Oregon State University Extension Service
Monitoring Oregon ash forests in the face of the emerald ash borer: A guide for small woodland owners and managers
© 2025 Oregon State University. Extension work is a cooperative program of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)
Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.
Oregon State University Extension Service
Alternatives to Ash in Western Oregon: With a Critical Tree Under Threat, These Options Can Help Fill Habitat Niche
© 2023 Oregon State University. Extension work is a cooperative program of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)
Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.
Oregon State University Extension Service
The hidden threat In firewood: Invasive forest pests
© 2016 Oregon State University. Extension work is a cooperative program of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)
Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.
Contact your local Extension forester if you have further questions, or submit questions through Ask Extension (see below).
