Next spray insecticide in the bag and close it up. Throw this away in the garbage.
As for myself, I would never go to such an extreme. Why would one need to spray a pesticide inside a sealed bag if is going to be taken away anyway? These are not chewing insects, and they are not going to escape. Yes, I would dispose of the bag, but no, I would not apply a chemical.
When the debate is lost, slander becomes the tool of the losers. - Socrates