Localized Treatment vs. Fumigation

For the Control of Drywood Termite Infestation
by Tony Angelo

Unless conducted regularly in conjunction with a preventive maintenance program, drywood termite inspections almost invariably result in recommendations for fumigation (tenting) of the structure. This, in turn, leads to both inconvenience and expense, as temporary accommodations must be provided for homeowners, pets, plants, and food. Roof damage may occur when workmen drag heavy tarps across wood shake, or tile roofs.

A common misconception is that during the swarming periods, the alates, or winged termites, fly from one area to another. In fact, they transport themselves through thermal guidance provided by prevailing air currents. This explains why existing colonies will swarm and re-infest within the same attic area, and tend to re-locate in the same susceptible areas of adjoining structures.

While fumigation is an initial solution, it leaves no residue to combat re-infestation. Localized treatments, on the other hand, are performed by opening the channels created by the termites themselves, and injecting an EPA approved toxin. This is commonly known as the drill and treat method. The toxin is absorbed by the wood and provides an inhibitive barrier against re-infestation in the specific area.

It is important to point out that localized treatment may have certain limitations in certain situations. As stated by the Structural Pest Control Board's definition of localized treatment; accessible areas are those able to be physically reached for hand treatment. Known infestations, noted on termite reports as "IA" (inaccessible), will upon appropriate approval, be exposed for further inspection if practical. Then a supplemental report will be issued to the Structural Pest Control Board with findings and recommendations.

In a study conducted by Dr. Atkinson at U.C. Riverside, twenty thousand reports were pulled at random to determine trends in control methods. Seventy percent (14,000) used spot chemical treatment as as the control method of choice.

When deciding how to best handle a termite problem, it is imperative that all identifications, recommendations, and corrections are provided by a licensed pest control operator. Work performed by unlicensed and unqualified personnel will not be acknowledged under the State's Health and Safety Act. It may also lead to potential liability exposure for the responsible parties.