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Emerald Ash Borer Update: Should Iowans Start Treating Their Ash Trees?
This article was published originally on 4/9/2008
At this time, there is no need for insecticide treatments for emerald ash borer anywhere in Iowa. The emerald ash borer (EAB), Agrilus planipennis, has been found 85 miles from Iowa in Peru, IL. As EAB moves closer to, and into Iowa, this recommendation may change as we learn more about the known infestation areas and the ever-changing status of control options. But for now, any application of insecticides to ash trees for EAB control is a waste of time, money and resources. The rationale behind this position is as follows:
Should Iowans Remove Ash Trees? We do not recommend removing healthy ash trees to prepare for the EAB infestation. Instead, enjoy the ash resource while you can. We do advise checking the condition of ash trees and note those that are declining or otherwise in poor health. If more than 50% of the ash tree crown is dead or if the trunk has large wounds or areas of dead bark the tree is at high-risk for potential infestation by EAB. Such trees should be considered for removal and replacement. For these high-risk trees replacement may be a better use of money than treating. When replacing ash trees consider species diversity and site conditions. Click here for a list of recommended trees for the Iowa landscape:If you have questions about your ash tree or insect pests of trees please contact ISU Extension Entomology, the Iowa Department of Agriculture and Land Stewardship, the Iowa Department of Natural Resources, your local nursery dealer or certified arborist. Emerald Ash Borer, adult beetle. Photo by David Cappaert, Michigan State University.
Year of Publication:
IC-499( 6) -- April 9, 2008