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What is Two-lined Chestnut Borer?

Two-lined chestnut borer (Agrilus bilineatus), is an insect that attacks oaks, beech, hornbeam and chestnuts. Generally these trees are stressed by drought, compacted soils or other insects or diseases, as the borer takes advantage of compromised trees mostly easily. Trees may be killed in the first year of attack but in most cases death usually occurs after 2 to 3 successive years of heavy infestation. Typically, the crown is attacked during the first year, while the remaining portions of the branches and trunk are infested during the second and third years.

Diagnosis: What Two Lined Chestnut Borer Looks Like

Look for small and discolored foliage, which and die back of branches in the crown. Leaves of infested branches turn uniformly red-brown and remain attached to the tree. The leaves on non-infested branches remain green. Infested oaks have a distinct pattern of dead and live leaves on them. These symptoms are more evident in hot, dry weather.


If you suspect your tree is sick, please call us immediately at (608) 609-8777, even if you not sure. We love talking trees!

Once we receive your call Our Certified Arborists spring into action. Here's what our process looks like:

Preventing Two Lined Chestnut Borer

Like many tree diseases, the Two-lined Chestnut Borer is attracted to trees under stress. This is why we always recommend pairing any disease treatment with a stress-reducing course of natural, full-spectrum nutrients.

Since soil compaction is generally contributing factor in all urban environments we have developed a specific soil-building program proven to reduce bulk density and alleviate compaction issues.