Spot treatments can be effective in many cases. But, there are limitations. The key to a successful spot treatment is to have access to all the active sites. The problem is finding all of them and having access to all of them.
Spot treatments can be also effective in stalling their progression by lowering the population in the known areas. Since Drywood termite damage is relatively slow and spot treatments are relatively inexpensive, they should be considered first.
A newer method being promoted, which we don't recommend, is "tentless" whole house treatments using a variation of boric acid or the newest of the new procedures, orange oil treatments. Both of these are really spot treatments with whole house guarantees. In the case of the boric acid treatments, there is no way the whole house will be treated. They are priced very high because you'll be calling them back, year after year.
The orange oil treatments are worse. They are very expensive and you'll be calling them back year after year. They are being sold as organic, which they are, but it is the acid that does the killing. The product label says all active sites need to be drilled and injected on a 1 inch staggared pattern. First, there is no way this can be done to a home once it is built. Secondly, the data shows the killing lasts only about 4 days with a successful kill rate of only 78%. Lastly, the oil left in the wood makes it more flammable.
Fumigation: Once the population has reached a certain stage, such as annual swarming, spot treatments are no longer an option. Fumigation is the only viable option once it reaches this stage.
Beware of fumigation games. A fumigation requires the correct amount of fumigant, based on cubic feet and for a specific amount of time. We see in the Tampa, Florida area, homes deliberately measured smaller to reduce the price to the customer. The result... a fumigation look and hassle without a full kill. Coincidentally, they guarantee to spot treat, if the fumigation fails! :)
Emergency Pest Patrol, LLC.