Question
i understand that this, on my tulip tree in st. louis, is because of aphids.

but i cannot reach the top of the tree, even with a hose, and don't know how to rid the tree, now that it's august...buy some lacewings???

thanks
chris collins

Answer
The best control is the use of an insecticide to spray the foliage and kill the aphids. There is a system that is used that injects the insecticide into the bark and the tree takes the insecticide up into the leaves. The spraying of a large tree will take a pressure sprayer but on a smaller tree can be done by a homeowner. The injection will take a professional. I would suggest you contact the St. Louis Urban (city) Forester and ask his advice on local controls and he should be able to give you some names of applicators. The phone number I have is   952/924-2565 and the name is Jim Vaughan. I do not know if he is still with St. Louis but the city should know.