Pros are making a dent with integrated pest management. The best professional exterminators now stage and pre-plan their services. Stage one doesn't even wait for your call. The pros are on site as a new home is being built. They treat all exposed wood before walls and floors are closed up. Part two of stage one calls for using better pesticides such as new reduced-risk d-limonene, an oil found in the skin of citrus fruits that penetrates and lingers on raw wood and later attacks termite shells and their eggs. For follow-up inspections, technicians run in lengths of fiber-optic cable that lets them "see" deep into dark nooks and crannies before opening walls and spraying insecticides.