ash borer denver

Ash Borer in Denver: What You Need to Know

The Emerald Ash Borer (EAB) is an invasive insect that poses a significant threat to ash trees in Denver. First detected in Colorado in 2013, this beetle has the potential to devastate urban forests and residential landscapes. Understanding the signs, symptoms, and treatment options for EAB is crucial for protecting Denver’s ash tree population.

What is the Emerald Ash Borer?

The Emerald Ash Borer (Agrilus planipennis) is a metallic green beetle native to Asia. It was first discovered in the United States in 2002 and has since spread to numerous states, including Colorado. The larvae of the EAB feed on the inner bark of ash trees, disrupting their ability to transport water and nutrients, ultimately leading to the tree’s death. You can find further comprehensive information on Emerald Ash Borer on Wikipedia.

How Does EAB Affect Denver?

Denver has a significant population of ash trees, making it particularly vulnerable to the EAB. The beetle’s presence poses a threat to the city’s urban canopy, potentially leading to widespread tree loss. This can have several negative consequences, including:

• Reduced shade and cooling effects
• Decreased property values
• Increased stormwater runoff
• Higher costs for tree removal and replacement

Signs and Symptoms of EAB Infestation

Early detection is crucial for managing EAB infestations. Some common signs and symptoms include:

• D-shaped exit holes on the bark (about 1/8 inch in diameter)
• Thinning of the tree canopy, starting at the top
• Increased woodpecker activity, as they search for larvae
• Vertical splits in the bark
• Epicormic sprouts (new shoots) growing from the base of the tree
• S-shaped galleries (tunnels) under the bark

Treatment Options for EAB

Several treatment options are available for protecting ash trees from EAB, including:

• Insecticides: Systemic insecticides can be applied to the soil or injected directly into the tree. These treatments can protect the tree for one to two years.
• Tree Removal: Severely infested trees may need to be removed to prevent the spread of EAB to healthy trees.
• Tree Replacement: Replacing ash trees with other tree species can diversify the urban forest and reduce the overall impact of EAB.

Frequently Asked Questions

How do I know if my ash tree has Emerald Ash Borer?

Look for D-shaped exit holes, canopy thinning, increased woodpecker activity, bark splits, and epicormic sprouts.

What should I do if I think my tree has EAB?

Contact a certified arborist or your local forestry department for an inspection and treatment recommendations.

How can I prevent EAB from attacking my ash trees?

Consider preventative insecticide treatments, especially for high-value trees. Keep your trees healthy with proper watering and fertilization.

Are all ash trees going to die from EAB?

Unfortunately, without intervention, most ash trees will eventually die from EAB. However, proactive treatments can save many trees.

How much does it cost to treat an ash tree for EAB?

The cost depends on the size of the tree and the type of treatment used. Contact a local arborist for a quote.

Summary

The Emerald Ash Borer is a serious threat to ash trees in Denver, but early detection and proactive treatment can help protect these valuable trees. By understanding the signs and symptoms of EAB, and working with qualified professionals, Denver residents can help mitigate the impact of this invasive insect and preserve the health of their urban forest.