jungle udry should never ever get any kills.
A simple ward or two and you shut down his lane presence completely, and with jungle changes he can't really sustain purely in the jungle, so at best he maybe can help save a lane from your team after you kill off a lane. Buy 75 gold wards and keep them up cause 75 gold is about 2 minions worth, and you will miss out much more farming by being dead than 75 gold for wards.
Keep them up and place them down river a bit having a ward in the bush isn't a good help as you are screwed by the time you see him. Keep it down the river just high enough to cover the path from triangle bush, and you have plenty of time to see him coming, when you do just run back and make him waste all of that time coming to bother you. The only lane he should have any option in ganking is mid, and most champions mid have stuns, snares, cc or escape which he doesn't have.
Poof zero effect udyr who becomes a stun machine and that is about it.