After receiving dual instruction in a 2 place, training vehicle, the plt took off on a solo flt from a 270 x 25 ft ultralight strip. He reported that after lift-off, the vehicle started drifting toward a tree. He initiated a turn to the right (away from the tree); but the vehicle began losing lift & subsequently crashed in a nose high, slightly right wing low attitude. The plt reported that the eng operated normally & that he did not use the spoilerons. However, witnesses observed the vehicle in an erratic yaw & reported seeing extension on the right spoileron & left rudder deflection, then later saw the left spoileron extend. The plt's instructor called on the radio to retract the spoilerons & increase power, but the plt stated he did not hear the transmission. The plt stated that his dual training, during the preceeding 2 months, consisted of takeoffs & landings only, and that he was not taught to use spoilerons and/or stall & slip maneuvers. The 2 place ultralight, used for dual training, was not equipped with spoilerons.