Question
This year our tulip poplars have been attacked by some insect that sucks the juice and secretes a sticky substance which fall onto anything below. The leaves have died all the way to the top and the trees are practically bare. My question is this: will these trees be able to survive or should they be destroyed?

Answer
Hello:

It sounds like you are dealing with a bad Aphid infestation. Provided that the the trees are in the right location and otherwise free of disease problems, you should be able to control this pest.

Systemic Insect Control products are effective in this area. One product that is available OTC can be purchased by anyone. Here is the product link:

http://www.bayeradvanced.com/tree-shrub-care/products/12-month-tree-shrub-insect