I am sure there are ways of stopping a lab from chewing on things but the only way I have stopped my labs from chewing on something is to put it out of reach. These babies have every chew toy made, I rotate their toys to keep them interested, and they manage to become fascinated with something like the plastic trash can lid. Or the float that holds the chlorine tablets (the pool got a little green until the fascination wore off).
Riley wants electronic chew toys (remotes and cell phones) and Boomer is more of a naturalist - anything wood (so much for the gardenias, and our wood pile is now chewed to sawdust) or rocks. He brought us 9 different rocks in one day. So, until your baby finds something new to chew on, I would put it somewhere else or accept that your garden hose just became a chew toy!
My lab boys: Krom (lab mix) 13 years old
Riley - ivory lab born 12-27-08
Boomer - white lab, born 4-3-09