The Emerald Ash Borer (EAB), a small but destructive beetle, has become a significant threat to ash trees in Minnesota. Understanding how to identify EAB and recognize the early signs of infestation is crucial for protecting your ash trees from this invasive pest. This article aims to provide you with essential information to identify EAB and detect early warning signs of its presence, helping you take timely action to safeguard your trees.
What is the Emerald Ash Borer?
The Emerald Ash Borer is a green beetle native to northeastern Asia. It was first discovered in North America in 2002 and has since caused widespread destruction to ash tree populations. Adult EABs are metallic green and about 1/2 inch long, making them visually distinctive but sometimes hard to spot due to their size.
Identifying the Emerald Ash Borer
Adult beetles
- Appearance: Metallic green, slender, and approximately 1/2 inch long.
- Time of year: Most active and visible from late spring to early summer.
Larvae
- Appearance: Creamy white, flat, and segmented, growing up to 1 inch in length.
- Location: Found beneath the bark of ash trees.
Early warning signs of infestation
1. D-Shaped exit holes
- Description: As adult EABs emerge from trees, they leave behind distinct D-shaped exit holes, about 1/8 inch in diameter.
- Location: Typically found on the trunk and branches of ash trees.
2. Canopy thinning and dieback
- Initial signs: Thinning of leaves and branches at the top of the tree.
- Progression: Gradual dieback of the canopy, usually starting at the top and spreading downwards.
3. Epicormic sprouting
- Description: When stressed, ash trees may produce new branches and leaves directly from the trunk.
- Indication: This is often a response to the damage caused by EAB larvae under the bark.
4. Bark damage/splits and galleries
- Bark damage/splits: Vertical splits in the bark can reveal the serpentine tunnels (galleries) made by EAB larvae.
- Galleries: These winding tunnels are under the bark and disrupt the tree’s ability to transport water and nutrients.
5. Increased woodpecker activity
- Observation: Woodpeckers feed on EAB larvae, so increased woodpecker activity on ash trees can be a sign of infestation.
- Visible signs: Look for bark damage or flaking off due to woodpeckers digging for larvae.
What to do if you suspect EAB infestation
If you notice any of these warning signs, it’s crucial to act promptly:
- Confirm the presence: Call us at 651-334-7555 to confirm if your tree is infested with EAB.
- Professional assessment: Seek advice on treatment options or the necessity of tree removal to prevent further spread.
- Report the infestation: Notify local agricultural or forestry authorities to help track and manage EAB spread.
Call today for a consultation and quote
Early detection and prompt action are key in managing Emerald Ash Borer infestations. By familiarizing yourself with these identification tips and warning signs, you can play a crucial role in protecting ash trees in your community. For professional advice and treatment options, contact our expert team. Together, we can combat the spread of EAB and preserve our valuable ash tree populations.