Ash Trees On Your Property

What is Emerald Ash Borer
Emerald Ash Borer (EAB) is an exotic beetle discovered in southeastern Michigan in 2002. This larva feeds on the inner bark of ash trees, disrupting the ability to transport water and nutrients. Most trees remain relatively stable after they die, but ash trees lose moisture internally and begin to fall apart relatively quickly. The trees' instability creates a public nuisance and can cause a hazardous situation.

There are absolutely no restrictions on how you may handle treating (or not treating) an ash tree on your private property. The Johnston Parks Department, however, is happy to assist you in preparing for EAB with guidance from the experts at Iowa State University Extension & Outreach.

Trunk Injections
The City of Johnston recommends trunk injections in healthy ash trees because injections are absorbed and distributed throughout the tree quickly (typically in 1 to 4 weeks) and are very effective. Research has shown that tree injections are tolerated in healthy green ash trees, especially if treatments are applied once every two years, small volumes of product are injected, and injection holes are small and shallow. Rotate annual trunk injections with other management options to decrease the possibility of long-term damage.

Tree Removal
Removal of your ash tree may be necessary if it appears damaged, unhealthy or susceptible to EAB. Determine if your ash tree has EAB signs and symptoms by calling a trusted tree and landscaping contractor.

Need Help
A great resource in figuring out what to do is Iowa State University Extension and Outreach. Visit their website for more information.

You may also reach out to the City of Johnston's Forest Crew Leader Tracy Irwin for help. He may be reached at 515-727-8091.

These links also offer good guidance:

How to treat an ash tree in the public right-of-way near your property (PDF)
EAB Treatment Options
EAB Insecticide Label Guidance (PDF)
Protect Bees from Pesticides (PDF)