Do not install foam board insulation or wall sidings below grade during construction. Make thorough inspections for evidence of termite activity at least once a year, preferably more. A pest control professional who has experience with subterranean termites should perform the inspection. Fumigation Generally, fumigation is not recommended to control Formosan subterranean termites. However, it may be necessary to apply fumigant gas to kill nests that are trapped within structures.
Fumigation is only effective if the soil has been properly treated first.
If a house is fumigated and the soil is not treated, there is nothing to prevent reentry of the termites from the soil. An understanding of termite biology and behavior is necessary for successful baiting. Some pest control professionals have had extensive authorization training in order to use the baits. The baits can be installed belowground or aboveground. The baits use significantly less chemical than traditional methods of control with good results.