The Q&A Archives: Arborvitae Leaves Turning Black

Question: I have been told that this is called scale, and to spray the tree with an oil spray called: ORTHO VOLCK or ORTHO Horticultural spray oil. Is this the best way to treat my tree?

Answer: Unfortunately, based on your description I am unable to identify the exact cause of your tree's problem.However, your County Extension (433-6731) should be able to make a positive identification and advise you of the most up to date chemical controls, if any.

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