New Holland TC30 Hydro 4x4, Gravely Zero Turn Mower
Thanks, Egon and Bird, both links describe the problem as 'bladder gall.' I did a lot of searching on my for 'maple problems' and didn't find anything that described the problem or had pics. Seems its an unsightly problem, but does'nt harm the tree. Thanks again
Our maple tree at our old house use to do that every year. I never thought much about it as it seem to go away after a while and the tree continued to grow more and more every year.