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worms on river birch


Question
how do i get rid of worms on a river birch

Answer
This sounds like birch sawfly. They feed in groups and can defoliate a tree. For small trees you can just pick the caterpillars off and destroy them. For larger trees I would spray the foliage with an insecticide called Orthene. This will kill the caterpillars . Check with your local nursery/garden type store for this product.

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