The emerald ash borer (EAB), Agrilus planipennis, is an exotic insect pest from Asia. The flattened, creamy white larval stage feeds below the bark and cuts off the living, water and nutrient conducting vessels causing tree death. Adults are small elongated oval beetles that are metallic green in color. This insect colonizes the top of ash trees (Fraxinus species) first, then moves down the tree.
As of February 2014, all 99 counties in Iowa were quarantined by the Iowa Department of Agriculture and Land Stewardship to slow the movement of this destructive pest to non-quarantined areas. EAB has been found in several Iowa counties, as well as in the neighboring states of Illinois, Kansas, Minnesota, Missouri, Nebraska, South Dakota, and Wisconsin.
Iowa State University Extension and Outreach experts encourage Iowa homeowners to evaluate their ash tree’s health and value in the landscape, and their commitment to years of preventive treatments. If an ash tree is within 15 miles of a known EAB infestation, preventive treatments are suggested for individual trees. The current suggested treatment areas in Iowa is provided in the map below. Check out all of the information (including some in Spanish) about this pest that threatens Iowa’s forests.
View one or more of the short video segments about EAB on Emerald Ash Borer Videos YouTube Playlist
Emerald Ash Borer Links
Emerald Ash Borer News Releases
- Emerald ash borer confirmed in Cherokee County (February 24, 2021)
- APHIS Changes Approach to Fight Emerald Ash Borer (EAB) (December 14, 2020)
- Emerald Ash Borer Discovered in Mills and Shelby Counties (October 26, 2020)
- Emerald Ash Borer Discovered in Sac County (August 6, 2020)
- Emerald Ash Borer Discovered in Cerro Gordo and Webster Counties (July 1, 2020)
- Emerald Ash Borer Confirmed in Audubon and Guthrie Counties (January 21, 2020)
- Emerald Ash Borer Discovered in Cass County (February 15, 2019)
- Emerald Ash Borer Discovered in 3 More Iowa Counties (August 13, 2019)
Frequently Asked Questions
- Common Problems of Ash Trees (SUL21)
- Emerald Ash Borer Pest Alert (NA-PR-02-04)
- Frequently Asked Questions on Emerald Ash Borer (script, pdf)
- Frequently Asked Questions on Emerald Ash Border (slides, pptx)
Management of Emerald Ash Borer
- Emerald Ash Borer Management Options - PM2084
- 2019 Multistate Insecticide Options for Protecting Ash Trees from EAB (pdf) (3rd Edition)
- Finding a Certified Pesticide Applicator - PM3074
- Protecting Bees from Pesticides - ENT45
- Finding an International Certified Arborist
- Emerald Ash Borer Insecticides: Label Guidance for Use Limits (pdf)
- Potential Side Effects of EAB Insecticides (pdf)
- Suggestions for Community Preparation for Emerald Ash Borer (pdf)
Ash Identification and Replacement Suggestions
- Ash tree identification (pdf) (E-2942)
- Small stature trees for Iowa – Ash Alternatives (FOR405)
- Shade trees for Iowa – Ash Alternatives (FOR406)
- Street Trees for Iowa Communities (pdf)
Visual Aids for Emerald Ash Borer Identification
- Signs and Symptoms of EAB (pdf) (E-2938)
- EAB Diagnostic Aid (pdf)
- EAB or Native Borer (PM3065)
- Native Borers and EAB Look-alikes (pdf) (E-2939)
- National Emerald Ash Borer
- Iowa Tree Pests - Iowa Department of Agriculture
- EAB-Iowa Department of Natural Resources
- EAB-Purdue University
Información del barrenador verde esmeralda en español
- Opciones de control del barrenador verde esmeralda – PM2084S
- El barrenador del fresno, el barrenador verde esmeralda del fresno o “emerald ash borer” (pdf)
- El barrenador del fresno (pptx)
Do you live in Iowa and have an insect you would like identified?
The Iowa State University Plant & Insect Diagnostic Clinic will identify your insect, provide information on what it eats, life cycle, and if it is a pest the best ways to manage them. Please see our website for current forms, fees, and instructions on preserving and mailing insects.
Contact information for each states diagnostic laboratory for U.S. residents. If you live outside of Iowa please do not submit a sample without contacting the Plant & Insect Diagnostic Clinic.