Emerald Ash Borer

The Emerald Ash Borer (EAB), an invasive pest that kills ash trees and has been confirmed in a number of Iowa counties. The Pleasant Hill Parks Department is happy to assist you in preparing for EAB with guidance from the experts at Iowa State University Extension & Outreach. For EAB treatment options, the City of Pleasant Hill recommends you contact a licensed professional.

It is estimated that there are nearly 1,000 ash trees on private property within Pleasant Hill. We advise owners of ash trees to take action and plan for either removal or treatment.

Chemical Treatment Options

Trunk Injections - Of the three chemical options, trunk injections are generally the preferred option within the industry. Professionals recommend treating healthy ash trees because injections are absorbed and distributed throughout the tree quickly (typically 1 to 4 weeks), and are very effective. Research has shown that tree injections are tolerated in healthy ash trees, especially if treatments are applied once every two years. Experts advise rotating the annual trunk injections with other management options to decrease long-term damage.

Soil Injections - Also commonly known as basal drenches should start when trees are still healthy, because large trees are not protected well in the first year after basal soil drenches. Basal drenches typically take 4 to 8 weeks to absorb and should be done beneath the soil surface 2 to 4 inches and 12 to 18 inches from the trunk. These injections are not as readily used as trunk injections because of excessively wet or frozen soil, compacted sites, or restricted surface areas.

Canopy Sprays - Not recommended due to the effectiveness, the need for special equipment, and possible adverse effects to non-target organisms.

Tree Removal

Tree Removal
- Removing ash trees may be necessary, if it appears damaged, unhealthy, or susceptible to EAB. Click here to compare local costs of treatment options or tree removal.

For more specific information, refer to the links below.

Signs and symptoms of EAB

Treatment options

Frequently asked questions