Tailwheel instructor with trainee reported a wing tip strike during landing. Instructor regained control and continued to landing.

Narrative

Student evaluation flight in tailwheel aircraft; staying in pattern for landing evaluations. I was evaluating the students ability to conduct a three point landing in a tailwheel aircraft. On approach; I noticed that the student was bringing the nose back too high above the ground and reducing power; so I stopped their reduction of power and began adding throttle to recover from the low energy state. However; the nose kept coming back and the left quartering crosswind began to pick up the left wing; causing the right wing to drop. The right wing made contact with the ground as power was allowing the aircraft to become airborne again. I heard the wing come into contact with the ground and once I had gotten the aircraft in a stable position to land; I set the aircraft down and taxied back to the ramp. The low energy state with a left quartering crosswind is what I believe led to this incident. Keeping the aircraft on the ground after contact was not my choice of action because when the wing touched the ground the aircraft was not in a controllable state to land.