To apply Termidor for drywood termites, inject the product into infested wood using a foam or liquid formulation. Drill small holes into the wood, targeting areas where termite activity is detected, such as near frass or exit holes. Inject Termidor into these holes to reach the termites within. Follow the manufacturer’s instructions for application rates and safety precautions. Termidor is typically used for subterranean termites in soil treatments, but its foam formulation can be effective for spot treating drywood termites. For extensive infestations, consult a professional pest control service.