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What type of borer is attacking this ash tree? (Image Album)

Posted by AxAbtAsh SD (My Page) on
Wed, Jun 20, 12 at 17:51

It’s in really bad shape, and has been for a while. I took down a couple large branches (4-5”) that were completely dead two years ago.

The last four pictures are of the base of one of those branches that I finally sawed off this year. There’s no apparent damage to the core of the branches, and none of the bore holes seem to go much deeper than just beneath the bark.

About half the branches on the tree altogether are now bare. The other ash trees around it have some dead branches as well, and the bark looks like it is coming off on some of the higher branches.

This is in Sioux Falls, SD, which should be out of the range of EAB and some of the other common borers.

Follow-Up Postings:

RE: What type of borer is attacking this ash tree? (Image Album)

it is imperative that you call your county extension office and inform them of this ....

a quick google search says EAB may or may not have hit SD ... which means the extension office might be very interested in your tree ...

but if they arent.. contact the state forestry division.. or whatever they call it ...

the large stripes almost make me think of a lightening strike some time back ...


Here is a link that might be useful: pdf link --- many borer types discussed

RE: What type of borer is attacking this ash tree? (Image Album)

Something is boring it. don't know what.

Need to have knowledgeable person look at it. Perhaps Certified Arborist if ken's suggestions don't work for you.

RE: What type of borer is attacking this ash tree? (Image Album)

Where are the trees dying? Most often with the Emerald Ash Borer the trees atart dying at the top. As a just in case, because people are the way the EAB moves around I would get someone from your South Dakota State university come out to look.
The borer has been seen and is known to be in Minnesots and Iowa, so it is possible they have been brought into South Dakota.

RE: What type of borer is attacking this ash tree? (Image Album)

EABs are notorious for doing their boring just under the cambium, they do not go deep. They kill by girdling. Also their tunnels are very serpentine. Many native borers go deeper, and don't have as much 'travel' in their tunneling. EABs also leave their frass behind them, packing the tunnels solid with sawdust. The segments on the larvae are rather distinctive.

How one disposes of EAB infected trees are different than how one disposes of trees killed by native borers. EAB wood here must be burnt to prevent spreading. In all cases, suspected activity by EABs should be reported to your forestry or extension department, especially if it's not known if they are active in your state or county. If an identification is positive, then the red flags go up to try to lessen the impact and speed of their spread. Just had an ash downed last week, massive sigh of relief when it was found to not be EAB.

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