The pilot was departing from an unimproved, mountain airstrip. During the takeoff ground roll, he moved the airplane to the right in order to miss some rocks that were on the airstrip. In the initial climb, the outboard portion of the right wing then collided with brush-like vegetation that had grown into the departure path. The pilot then flew the airplane to an airport where maintenance personnel examined the airplane. The pilot did not report any mechanical anomalies. The Federal Aviation Administration inspector reported structural damage to the right wing.