What is Two-lined Chestnut Borer?

 Two line Chestnut Borer

Two line 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.

 Damage from Two Line Chestnut Borer.

Damage from Two Line Chestnut Borer.

 Tree infested by Two Line Chestnut Borer. Note partial defoliation.

Tree infested by Two Line Chestnut Borer. Note partial defoliation.

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.

Treatment

If you suspect your tree is sick, please call us immediately, 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:

  • You call, we answer!
  • We will schedule a time for our certified arborists to stop in and inspect your tree(s).
  • During our visit, we will take the time to address any worries you may have and do a full inspection and analysis of your yard to make sure everything is healthy and happy.
  • We will provide you with an easy-to-understand write up of what we've discussed.
  • When you give us the okay, we will schedule a time to complete the work.
  • Final step: You are satisfied and your trees are pest free.

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. This program can be found in our Natural Lawn Care page.