Voted Best Answer
Apr 16, 2013 - 07:36 AM
Subterranean termite control has evolved over the last 15 years from a "chemical barrier" treatment method, to a "chemical contact" treatment. This means that instead of simply treating all readily accessible areas of the home with chemicals, that only strategic areas can be treated, and ones that are most conducive to termite infestation. HOWEVER, this depends on the chemical being used.
In the case of Termidor SC or any of the fipronyl products, an outer perimeter treatment (trenching/soil treatment) combined with an indoor spot treatment where the termites are active is generally the most recommended treatment.
Baiting with Termite Bait Stations when used in combination with Termidor, is not generally recommended. The reason is that studies have shown Termidor to "affect" termites up to 25 feet from the treated area. So if the perimeter was trenched and treated, and then a bait station placed only a couple of feet away, the chances of termites ever hitting that bait station are very low, practically zero.
In the case of Premise (non-repellent), or Dragnet (repellent), or any of the repellent Termiticides, It is possible that the termites could find the bait station and begin a feeding process. These products have limited "outer band" effects on foraging termites. Usually, the affect is limited to the area of treatment, nothing more.
Your question really depends on what chemical was used for trenching and treating. My opinion of placing 2 termite bait stations on the foundation, is that this was primarily for "show". This was done to make you think that you got your moneys worth. I don't recommend termite spot baiting, and don't think that any of the manufacturers recommend it either. A complete perimeter baiting system in my opinion is the only way to go. However, my advice would be to use a baiting system as the primary means of treatment, install a complete baiting system, and then use chemicals to spot treat the termite activity. Not the other way around.
Hope this makes sense.