The glider collided with a tree during landing, and the right wing was torn from the fuselage. After clearing a set of power lines, the glider was 15 feet agl. The pilot saw a tree, and the glider drifted to the right of the runway centerline. He misjudged the clearance between the tree and the wing, and a collision occurred. The glider spun 270 degrees from its original flight path before coming to rest. The pilot recommended flying a higher approach to prevent future accidents. The pilot noted no mechanical malfunctions with the glider prior to the accident.