Shortly before noon eastern time, the ATP-rated pilot attempted to land the Diamond DA-40 at a private field. Neither the pilot nor his passenger were injured. The pilot said he circled the field twice before setting up for a full-flap landing to the south. Despite flying as close as possible to trees on final and performing a slip to lose altitude, the airplane landed half-way down the 2,500 foot-long turf runway. The pilot retracted the flaps, applied maximum braking and then lost directional control during the landing rollout. Both wings were substantially damaged when the airplane impacted a knoll during the runway excursion.