On August 16, 2001 at about 1030 eastern daylight time, a Cessna 152, N69120, registered to Kissimmee Air Center and operated by Orlando Flight Training, Inc., collided with a fence during a precautionary landing in the cow pasture near Summerfield, Florida. Visual meteorological conditions prevailed at the time and no flight plan was filed for the 14 CFR Part 91 instructional flight. The airplane was substantially damaged and the student pilot, the sole occupant, was not injured. The flight originated about 0855, from the Hernando County Airport, Brooksville, Florida. According to the pilot, he was on a cross-country flight in preparation for a checkride that was scheduled for August 20, 2001. The first leg from Kissimmee to Brooksville was uneventful. The flight departed for the second leg and while en route, the cloud base decreased, resulting in his flying at a lower altitude. The flight continued and when it was near the destination, the weather became increasingly worse. The flight encountered instrument meteorological conditions (IMC) and he elected to continue flying in IMC due to deteriorating weather behind his position. He then elected to turn to get out of the IMC conditions but momentarily lost control of the airplane. He recovered from the loss of control and descended to just above the treetops, then elected to get on top of the cloud layer and climbed into IMC conditions. He again descended and reversed course to back track. He was unable to locate landmarks and obtain assistance from air traffic control to his "Pan" calls on 121.5. With a thunderstorm moving from west to east he elected to land in a field and flew downwind, base, and final leg. He landed the airplane in the field but during the landing roll, the airplane collided with a fence collapsing the nose landing gear. He secured the airplane and waited for further assistance. According to the Operations Manager for the operator, examination of the accident site revealed that the airplane touched down in a first field then rolled approximately 1,000 feet before colliding with the barbed wire fence. During recovery of the airplane from the field, each fuel tank had 5+ gallons of fuel; the left wing fuel tank had slightly less fuel when recovered.