Orange Oil like other termiticides such as Termidor SC or Altriset SC can have close to 100% elimination rate when applied locally to detected or proposed drywood termite infestation areas. The problem is that localized treatments almost always are ineffective and they will need to be redone in the future by a complete drywood termite treatment anyway. Orange Oil does not even have a residual effect as opposed to other chemicals, and especially borates (Timbor Professional and BoraCare) so that people would think “oh well, now I have to tent my house, but when I spent $2,000 last year on an “Orange Oil Green Job” applied to my bedroom wall, at least that part of the house is now protected against drywood termite infestation since fumigation will not prevent at all”.
Since local treatments do not require any significant use of a termiticide, discussing about its toxicity is meaningless. For example, treating a rafter tail infestation with Termidor SC will require very miniscule amount of it to be injected inside the wood on exterior of the house. Merely common sense hints that from a drop of that chemical to an outside or even inside wood member of the house no significant vapors will arise so that the homeowner will breath them and get exposed to a toxic chemical application. However, Orange Oil is not being applied in form of foam neither. It is being applied on detected drywood termite infested areas and may be applied to adjacent areas too. For Orange Oil to be applied to the entire house all wood members should be drilled about 6 inch, and even if it was possible considering the fact that many wood members are merely unreachable, then rebuilding the entire house would be much easier than drilling every single piece of wood of it.
So, for a material or method of termite treatment to be a complete treatment it has to have two features:
a. close to 100% elimination rate at the area applied
b. be able to be introduced to every single wood member in a house or property in a way to achieve its close to 100% elimination rate on all wood members.
While Orange Oil has the first attribute, it lacks the second one.
On the other hand, recently pest control operators gained access to a very sophisticated chemical called Altriset. It has been recently approved for drywood termite control use. Rumors even spread that DuPont spent around $500 million in the USA to get it tested and registered by EPA. While effectiveness of Altriset is close to that of Termidor SC, it does not have significant adverse effects to applicators and residents, but only to insects due to its mode of action. While during applying Orange Oil one has to wear special clothing and personal protective equipment, none of this applies to Altriset.