Aspen Tree Troubles

Does anyone else have as many problems with Aspen trees as I do? I thought they were easy to grow . . .
Answer: Aspens are a unique tree. When we see beautiful groves of them growing wild in the mountains,

Controlling Aphids and Other Pests

I found sticky residue on my car parked under my aspen trees. When I looked up I found little green bugs which I found out are aphids. Will they get on other plants too?