Cankerworms have been a problem in spots around Virginia for the past several years.  In most instances no control is needed unless the trees are severely or entirely defoliated for multiple years in a row. 

Your orange powdery “hills” could be a couple of things – one possibility is some type of fungus infection; another possibility is infestation by some sort of wood boring insect (wood peckers can find these insects and do damage going after them under the bark). 

I would suggest you arrange to have a certified arborist visit and evaluate your trees.  They will charge a fee for the evaluation and they can give you recommendations for how to manage the problem.  To find a certified arborist for your area, go to www.goodtreecare.com.

Debbie