if you do go out and collect some from the trees...
Spread it out onto a tarp so that the spanish moss is about an inch high or less.
Next mix equal parts water and ammonia together, and spray over moss.
Let it "bake" in the sun, rake it up, spread again and repeat spray.
After about 2-3 times you should see the dead bugs on the tarp. You can then bag your moss for later use.