Repairing a pitch mark is permitted under Rule 13-2 as long as it does not include enhancing your line of play, the region of planned stance or swing, or the position or lie of the ball. In stroke play, any of these faults would result in a two-stroke penalty or a hole loss in match play. In general, a divot can be fixed by filling it in with dirt from around the plantings or by using a special repair plug. Make sure that you do not use grass from elsewhere on the golf course or else you might get disease infecting the roots of your plants. If you are worried about someone cutting down a tree on which your ball is resting, ask the club house keeper if there is somewhere on the course where you could put up a warning sign. They may even help out by putting one up for you. Finally, remember that the people who work at the club house are not allowed to make decisions on whether your repair is acceptable. If you have doubts about whether your work has been done properly, then you will need to find another way to fix the problem.