Zone 7 seems kinda warm for a birch tree (they are northern temperate /
sub-arctic trees.) So maybe that's the problem.
Have you seriously disturbed the soil near the tree (eg, rebuilt a
driveway or walkway)? Birch trees do not like have their toes stepped on.
Mine are only several years old. They are whitespire birch only about 12'
tall. I checked trunk & every branch for those D shaped bb size areas but
found nothing. I'm a little concerned about someone mentioning they are
not for full sun. When planted, the instructions given were to plant in
full sun. Hence they have sun from about 9 am on. No little caterpillers or
bugs on the leaves. I'm spraying with a fungicide to see if that will help?
Any other ideas?
Thank you for your thoughts.
On Mon, 20 Jun 2005 13:53:40 -0400, J. Davidson wrote:
Good day J. Not seeing a photo of the infected leaves or tree makes it a
bit difficult assess the cause. With that said, I would suspect Birch Rust
A photo of Birch rust:
Birch rust ( Melampsoridium betulinum ) starts to show up in early summer
as small, yellow spots on leaves. These then turn in to brown spots with
Check out this page and see what you think:
Click Ornamentals> Birch> Rust>
Or you can follow this huge link:
A more common problem around here for birch is aphids. With heavy
infestations, the leaves can become yellow and drop. Along with an aphid
infestation you generaly find black sooty mold on the tops of leaves and
you may notice many ants climbing your tree. The ants are farming the
aphids for honeydew and they tend to protect them from predators. If you
find aphids, I would suggest that you hose the tree off with a garden hose
every few days for a couple of weeks. Take aim for the underside of the
leaves where the aphids live. After they get washed off, their good as
dead but aphids have many generations of eggs that hatch over a few weeks.
Generally the ladybug nymphs will keep the tree clean after the ladybug
populations get large enough.
Yard Works Gardening Co.
I'm in zone 7 too and noticed same problem in the neighborhood. I
think it due to the rain here in Charlotte a couple weeks ago. We got
5 inches in about one day and it may have killed off some roots. I've
similar problems with red maple but the silver maple is doing better.
I've a large oak that leaves on the ends of some branches died off.
I think it due to the rain. Hold off the watering and they will
likely come back.
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