Embark Environmental
What is Emerald Ash Borer (EAB)
The emerald ash borer is a native boring beetle to South East Asia, and was first reported in the Great Lakes region during the summer of 2002.(Muirhead et al. 2006)
At this time researchers didn't know the large scale impact this invasive beetle would have across the united states.
Now in 2025, the emerald ash borer is an invader of the whole Untied States.
Picture of Bark
Research has shown soil drenches or Tree injections of imidacloprid provide tremendous EAB protection for smaller ash trees [six inches or less diameter at breast height (DBH)] in the first year after initial treatments. Larger trees could require two continuous years of treatment before the trees are effectively protected. Treatment of larger trees should begin before the trees become infested.(Liesch and Williamson 2025)
Feeding emerald ash borer larvae lead to the girdling of the host ash tree, and this causes millions of ash tress to parish.(Marshall et al. 2013)
infestation level of EAB is rather difficult to determine at premature stages of an infestation, insecticide treatments may be warranted to prevent and mitigate damage by EAB.(Liesch and Williamson 2025)
What to Look For
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Thinning Canopy
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D-shape holes in bark
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extensive woodpecker damage
Resent Spread
Map created by US Department of Agriculture in 2020, showing United States by county where EAB infections are along with where biocontrol's have been released to control
Learn More About biocontrols :
Image: USDA's Emerald Ash Borer Program Report Update 2020
Source: https://content.govdelivery.com/accounts/USDAAPHIS/bulletins/2b1d871
Extensive Range
Emerald Ash Borer is in 35 states and the District of Columbia
States where insect is found includes Alabama, Arkansas, Colorado, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, West Virginia, and Wisconsin.
Impacts To Forest
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Inject Now as a Preventive Measure,
Preserve Tree Health and Native Species Genetics
Liesch, P., and R.C. Williamson. 2025. Professional Guide to Emerald Ash Borer Insecticide Treatments. Wisconsin Horticulture. Available online at https://hort.extension.wisc.edu/articles/professional-guide-emerald-ash-borer-insecticide-treatments/. Accessed January 3, 2025.
Marshall, J.M., E.L. Smith, R. Mech, and A.J. Storer. 2013. Estimates of Agrilus planipennis Infestation Rates and Potential Survival of Ash. American Midland Naturalist 169:179–193. The University of Notre Dame.
Muirhead, J.R., B. Leung, C. van Overdijk, D.W. Kelly, K. Nandakumar, K.R. Marchant, and H.J. MacIsaac. 2006. Modelling Local and Long-Distance Dispersal of Invasive Emerald Ash Borer Agrilus planipennis (Coleoptera) in North America. Diversity and Distributions 12:71–79. Wiley.