I would like to make use of some of the fantastic lichen and moss covered fallen wood laying about in the forest surrounding my condo as orchid mounting branches in my new vivarium. Since I wish to keep the living stuff on the wood alive I was wondering what would be a good precautionary measure to kill any critters or bad stuff on it on it without baking it. The outside temps 30-40*F should be enough to have killed most insects for this year. I thought about spraying it with pyrethium spray but if I am to be successful with the hatching of the Phylllium giganteum (armored leaf insects) what will they think of crawling on wood which had at one time been sprayed with that and then rinsed several times even if it was months before they were born and had plenty of water misted on it since?