General Information
Why is EAB important?
What does EAB Look Like?
What does an Ash Tree Look Like?
How Do I Know If My Trees Have EAB?
Where has EAB been found?
Firewood Regulations
State and Federal Quarantines
Quick Link for Industry
Management Options, Tips and Tools
For Homeowners
For Woodlot owners
For Communities
For Professionals
What Is Wisconsin Doing About EAB?
Wisconsin's Response Plan
Survey Program
Upcoming Events


Agrilus planipennis
The scientific name for emerald ash borer
Learn more about this destructive, invasive insect.

Fraxinus is the genus name for all true Ash Tree species.
UW Herbarium listing

Bark splits
Vertical splits in the bark are caused due to callus tissue that develops around larval galleries. Read more about this and other symptoms of emerald ash borer.

Crown dieback
A reduction of leaves in the upper and outer branches of a tree. This can occur on many tree species and is a symptom of disease or insect infestations such as the emerald ash borer. Read more about this and other symptoms of emerald ash borer.

D-shaped exit (or emergence) holes
As adult EAB beetles emerge from under the bark they create an exit hole that is ~ 1/8 inch in diameter and D-shaped. This is one sign of the presence of emerald ash borer. Note: other, native, wood-boring beetles also create exit holes that are either much larger or round instead of D-shaped.
Read more about this and other signs of emerald ash borer.

Detection Tree Survey
Used in detection surveys for emerald ash borer. A detection tree is an ash tree (preferably declining in health) that a surveyor girdles, or wounds, causing the tree to release beetle-attracting chemicals. The tree is then cut and peeled of its bark in search of the beetle.
Read more about Wisconsin's detection survey programs.

This is a commonly used abbreviation for emerald ash borer.

Woodpecker damage that looks like strips of bark have been pulled off of the tree, due to large numbers of larvae under the bark.

Fraxinus americana (or F. americana)
White Ash Tree
UW Herbarium listing

Fraxinus nigra (or F. nigra)
Black Ash Tree
UW Herbarium listing

Fraxinus pennsylvanica (or F. pennsylvanica)
Green Ash Tree
UW Herbarium listing

Fraxinus quadrangulata (F. quadrangulata)
Blue Ash Tree
UW Herbarium listing

Immature life stage of emerald ash borer and also the destructive stage. Larvae are cream-colored, slightly flattened (dorso-ventrally) and have pincher-like appendages (urogomphi) at the end of their abdomen. Larvae eat on the tissues of an ash tree, underneath the bark, disrupting the tree's ability to move water and nutrients. Learn more and see pictures of an EAB larva.

Purple Panel Trap
Used as a survey tool to help detect the presence of emerald ash borer.
Read more about Wisconsin's detection survey programs.

A quarantine is a system of rules administered by the USDA Animal and Plant Health Inspection Service and the WI Department of Agriculture, Trade and Consumer Protection. The rules are intended to help prevent the spread of EAB

S-shaped larval galleries
As larvae feed under the bark they wind back and forth, thus creating galleries that are packed with frass and sawdust and follow a serpentine pattern

Epicormic sprouting at the base and/or on the main stem of the tree

Visual Survey
Visual detection surveys for the signs and symptoms of emerald ash borer are conducted from the ground

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