A bit late to ask this if the answer is "no," but my wife's parents just had their house tented and fumigated for termites. Is the wine under the house safe?
Given what Stuart has told us about intact corks (1 headspace exchange per decade) I'm pretty confident that the insecticide is not getting into well-sealed bottles. There's going to be a lot more residue in the house itself than the wine. However for leaky bottles, might there be some cause for worry? Obviously insecticides are often pretty nasty nerve poisons...
Walt