Mar 10, 2015 - 06:57 AM
D-limonene kills insects on contact. It does not leave much if any residual for future control. Basically, once it is applied, it either kills them, or it doesn't. The commercial applications for D-limonene and Drywood termite control, involve injecting it into the wood into which the drywood termites are living. This involves drilling many, sometimes hundreds of holes into the wood, and potentially into the chambers where the termites are living inside the wood. It is a very time consuming and labor intensive process, and not as simple as just spraying the wood. That won't work.
A better product although not organic is either Termidor Foam or Termidor Dry. Fipronyl, the active ingredient, has a transfer effect on the termites. Once termites are exposed to it, they pass it off to other termites and it will eventually work back to the colony. D-limonene won't do this. Honestly, for drywood termite control, there is nothing organic or non-chemical that I have found to work. D-limonene treatments are hit and miss, Electrogun treatments using electricity, and Cryo Gun treatments using freezing temperatures are the same. All treatments are expensive and only marginal in control.
Tent fumigation is always my #1 recommendation. The gas (Vikane) does not leave any residue whatsoever. Once the house is fumed, and then cleared for reentry, the gas is gone. It's the most efficient treatment in my book.
Hope this helps.