The pilot reported the flight was conducted on an instrument flight rules flight plan. The initial portion of the flight was in visual meteorological conditions. However, as the flight neared the intended destination airport, the weather conditions had deteriorated and an instrument approach was required. While on the final approach segment, the airplane drifted left of course. As the pilot was correcting and looking for the runway, he did not notice the airplane had descended below the minimum descent altitude. He initiated a missed approach but was unable to avoid trees in the airplane flight path. Since the runway was not in sight, he decided to divert to a nearby airport with visual conditions. The remainder of the flight was uneventful. The airplane sustained substantial damage to the right wing and stabilator from the tree impact. The pilot stated there were no failures or malfunctions related to the airplane before the accident.