Emerald Ash Borer Pictures from St. Paul Ground Zero!
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Looking at this canopy does it look any different that any other stressed ash tree? |
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Yes, there is dieback from the top down but without seeing galleries would you eliminate ash decline, ash yellows, SGRs, drought effects, poor planting location... |
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Can't you tell that this is an infested tree? |
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Now this tree has a very thin canopy...but it's also the most infested of the trees we looked at along this block. |
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Image of emerald ash borer (EAB) galleries underneath the bark of a green ash tree.
Of course, only obvious now that the bark is gone :). |
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Image of emerald ash borer (EAB) galleries underneath the bark of a green ash tree.
You may know you want to look underneath the bark if you see a lot of wood pecker holes. |
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Image of emerald ash borer (EAB) galleries underneath the bark of a green ash tree. |
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Galleries were found along the stem. Attack begins at the top of the tree so if there are signs this low in the tree it means there's a heavy infestation. |
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Emily Barbeau, City Forester for City of Minnetonka, points to EAB galleries. |
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Image of EAB gallery filled with frass.
Picture of pointer finger for scale. |
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"D" shaped exit hole on bark.
Note- Pinky pink nail used for scale. This exit hole was only found after the two of us spent at least 10 minutes trying to find one!
Lesson and confirmation: "D" shaped exit holes are not easy to find! |
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An individual gallery.
Notice how the gallery enlarges as the larvae gets bigger and bigger. |
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Not a "D" shaped exit hole, instead a wood pecker hole! A hole that's at 5'6" eye level!! I would think, not that common.
Wood pecker holes were all over these trees because, of course, they were after the larvae and this tree was heavily infested! |
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Wood pecker holes all along the main branches and onto the main stem. Obviously this tree has been infested for awhile and it's not new! |
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Epicormic shoots were all along the stem. Not at the base, but along the stem and along other large branches in the canopy. |
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Epicormic shoots were all along the stem. Not at the base, but along the stem and along other large branches in the canopy.
You may notice that someone ripped off the shoots in previous years. |
Other useful links:
Minnesota Department of Agriculture Response Steps
Press release about ash tree treatments
Insecticide Options for Protecting Ash Trees From Emerald Ash Borer
The destructive emerald ash borer: It's here - Star Tribune Article- May 15th, 2009
Video: EAB Tree Removal from MDA YouTube Channel
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