it is probably due to some kind of sucking insect. we saved a newly planted river
birch from an infestation by using systemic insecticide, spreading it out over the
root zone and watering it in so the tree takes up the systemic into all the leaves.
It does take a while, but it knocks the suckers down over several weeks. we had to
buy a couple cans of it for an 8-10 foot tree, but now that river birch is really big
and thriving 10 years later. only had to use the stuff once. Ingrid


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