I use the same exact screening method as Tree Spud shows in post #18 on page 1. No problems as I plant the screens below soil level to prevent tunneling mice & voles. We've used plastic guards and spiral tree wraps and corrugated black drain pipes for tree protection previously. ALL FAILED. The spiral wraps opened up as the trunks expanded, and the mice chewed a perfect spiral pattern where the wraps exposed the bark. Once the spiral wraps were removed, the chewed bark showed the spiral pattern of where the plastic wraps had been open enough to allow the mice access to the bark. Plastic tubes and drain pipe just made great nesting "hotels" for the mice and voles to set up shop. - - - - - - Aluminum window screen or 1/4" hardware cloth are tops IMO. Good air circulation with them too.