I would think it would be extremely deadly. Why are you tenting? There is a company in my part of the world (southern California) who uses an orange oil extract. Can't think of the name of the company and I'm not sure if they are only in So. Cal but there is probably something similar near you. The somhow inject the oil directly into the wood, causing it to weep into the infested areas. I think that would be much safer, IMHO