Two Lined Chestnut borer effects the oak trees of Minnesota. While the name often confuses homeowners when diagnosing oak trees, this insect has ran out of food supply. The Two Lined Chestnut borer was found in chestnut trees as the name suggests. When they took out chestnut trees they adapted and are now working on all oak varieties. Oak trees are an easy transistion as they are hard wooded just like chestnut trees.
These insects are very similar to the famous emerald ash borer. They are both flat headed borers. They make the same exit wounds out of a tree as they exit. The wound is shaped like a "D" and has the flat end on the bottom like the picture on the left hand side. Also similar to the emerald ash borer this insect lays eggs in the living layer of the tree and the larvae are hatched and eat the trees veins that supply the tree with nutients and water.
This insect emeres from oak trees in June to July and can be treated against with the same chemical as Emerald Ash Borer. This is a much more current problem to the trees of Minnesota. It can be found in almost every city in the metro area. Sadly enough, the oaks that are around are a hundred years old or more in most cases.
Since oak trees get oak wilt as well it is important to know the differences between these two harmful diseases. Learn more about the difference between the two problems on the fungus or insect page.
Two Lined Chestnut Borer
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Two Lined Chestnut borer can be diagnosed if your oak tree has hanging brown leaves in clumps. It is usually too late once you see a bunch of holes around the trunk like the picture on the left shows. It is easy to notice some things around your yard though. These insects like many start on smaller branches. Usually they are about an inch in diameter. Good thing is that this insect will not kill your tree in the first year so you can see its progression through your tree and call Arbor Doctor to help you out getting rid of this pest.
Noticing the holes on little branches that fall to the ground can be very important in diagnosing problems with oak tree and many other insects. Also noticing die back in sporatic nature instead of sections dying in your tree will help diagnose a problem. If you have an oak tree and you live in the Twin Cities it would be important to have someone check out your tree. Our initial consultation is free and we check every tree in your yard.
