Birch > Trunk/Branches > Holes in stem or branches
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Bronze birch borer
- D-shaped exit holes can eventually be observed on the trunk
- S-shaped galleries can be seen under the bark
- Foliage at top of the canopy first becomes sparse
- Eventually twigs and then branches dieback starting at the
top of the canopy and progressively working its way down
- Raised lumps or ridges can be seen on the trunk and branches
- Preferred hosts are European white birch and whitebarked Himalayan birch; paper birch, gray birch are also attacked; river birch is rarely infested
- More information on Bronze birch borer...
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- Evenly spaced holes in main stem, approximately ¼ inch, arranged in a linear or columnar pattern
- More information on Sapsuckers...