Emerald Ash Borer
Emerald Ash Borer (EAB) is an invasive beetle that attacks and kills ash trees. First discovered in the United States in 2002, EAB has spread across much of the country, including Wisconsin, and poses a serious threat to our urban and natural forests. The beetle’s larvae burrow into the tree’s bark, disrupting the tree's ability to transport nutrients, ultimately leading to the tree’s death if left untreated.
How to Identify Emerald Ash Borer
Identifying EAB early can help save ash trees from significant damage. Here’s what to look for:
- The Beetle: The adult beetle is metallic green and about ½ inch long. They are active during the summer months and can be seen on or near ash trees.
- Tree Symptoms:
- Thinning Canopy: One of the first signs of EAB infestation is thinning of the tree’s upper canopy as the beetle disrupts the tree’s vascular system.
- D-Shaped Exit Holes: When adult beetles emerge, they leave distinctive D-shaped exit holes (approximately ⅛ inch wide) on the tree’s bark.
- Suckering (Epicormic Sprouts): Infested ash trees often develop sprouts or "suckers" from the base or along the trunk as a sign of stress.
- Woodpecker Damage: Increased woodpecker activity is another sign, as woodpeckers feed on EAB larvae beneath the bark.
How to Care for Ash Trees
Proactive care and management are essential to preserving ash trees in the wake of EAB infestations.
- Monitor Your Ash Trees: Regularly inspect ash trees on your property for the signs mentioned above. Early detection can make a difference.
- Treatment Options: If an ash tree is still healthy or showing minimal signs of infestation, treatment can prolong its life. Treatment is most effective on healthy trees and should be repeated every 2-3 years, depending on the product.
- Removal: If a tree is heavily infested or poses a risk to people or property, removal may be necessary. .
Planting Alternatives: Diversifying the urban forest is key to maintaining a healthy environment. When replanting, consider selecting a variety of tree species to reduce the risk of future pest invasions.
Sun Prairie’s Management of EAB
The City of Sun Prairie is actively monitoring and managing the spread of Emerald Ash Borer. Our Forestry Division is working to treat, remove, and replace infested ash trees within city parks and public spaces. Residents can learn more about the city’s EAB management plan, including treatment schedules and replacement programs, by contacting the Forestry Division.