I have Burr Oak trees and I had these short limbs about 1-2 ft. growing out of the main trunk from about 4 feet off the ground all the way up to the first big limbs about 15 feet up. They are old and mature trees. I trimmed these limbs off this year back to the main trunk and now I have new sprouting limbs coming back. Is there something I can spray or put on these to help stop these new limbs from back and not damage or hurt the trees? It is a lot of work to trim these little sap suckers. I do not have a pole saw which would make work a lot easier. Thanks for any help you can offer.