Purdue Landscape Report: The emerald ash borer (EAB), Agrilus planennis, is still one of the most damaging insect pests ever to invade North American forests. Unlike most native boring insects, this beetle can attack and kill relatively healthy ash trees. In Indiana cities we found this insect capable of killing most of the unprotected ash trees within 6 to 10 years. Nearly 20 years after its first detection in Indiana (2004), trees still need to be protected to keep them alive. The benefits of these living ash trees easily justify the cost of monitoring them. We provide answers to common questions people have about the need for continued treatment.
We recently completed a 10-year study in Indianapolis, where large ash trees were treated at 3-year intervals (2013 and 2016), Although they were well-protected through 2019, we saw a slight increase in damage 4 and 5 years after the last injection (2020 and 2021). By the 6th year trees after the last treatment (2022), trees declined to the point that they were a safety hazard. Overall, spring treatments were more effective than fall treatments.
For the full article please visit Purdue Landscape Report: Should ash trees still be protected from emerald ash borer?
New Hope for Fighting Ash Borer, Got Nature? Purdue Extension-FNR
Invasive Pest Species: Tools for Staging and Managing EAB in the Urban Forest, Got Nature?
Emerald Ash Borer, Purdue Extension-Entomology
Emerald Ash Borer Cost Calculator – Purdue Extension Entomology
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Landscape Report Shares Importance of Soil Testing, Purdue FNR Extension
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Bob Bruner, Exotic Forest Pest Educator
Cliff Sadof, Professor, Ornamental, Pest Management
Purdue Entomology Extension Coordinator