i cut some live elm this spring, went to cut it up this fall and its peppered with holes and under the bark is full of the worms .suppose the duch elm bug..so i removed most of the bark and worms but some remain..can i cover this pile early next spring with a tarp and let a few bug bombs in the cans go off under the tarp to kill the ones that make it throu the winter..dont want any more in my trees...