Keep watch for sprigs to show down near the base of the tree trunk (next to the graft area). You will be able to identify the graft area because of the bulge where the variety is grafted to the root stock.
While these shoots are natural we want to get rid of the so that we keep the tree variety that we purchased. With young shoots simply snap it off with your fingers. If you have older ones use a pair of hand clippers and trim it off right close to the trunk.