Spruce budworm caterpillars are eating all my trees! Thought the cold winter would have done them in, but not so, back as strong as ever.

I have many trees in my yard, calling in a spray company would be very pricey. Would like to have a go at spraying them myself. Anyone know of an affordable sprayer/fogger to apply malathion far up the tree?

Or know a decently priced tree pest control service?

Any suggestions appreciated!