describe the problem, are the yellowjackets actually attacking the colony, or simply trying to sneak in. there are many traps for wasps and yellowjackets available or the formula for the baits are readily available even here in these forums. if merely a attampted sneak thief--if the colony is strong they yellowjacket will be either chased away or killed.
When I was a teenager we had a swallow's nest at our house that got attacked by yellow jackets... they killed and ate the baby birds over the course of a couple of days. They are absolutely viscious predators, and not good for the environment here in the states at all. Any other wasp I'll let live, but not yellow jackets.
thanks for the replies. My situation is that I have just started with a 3 frame nuc. On day 2 the yellow jackets started attacking. I was finding about 30 dead bees in front of the hive each day. I witnessed 1 yellow jacket in a one on one with a bee in front of the hive. As i watched, another one on one struggle came tumbling out if the front of the hive. Needless to say the yellow jackets are now toast. I was surprised that a bee could take on a yellow jacket one on one. I now have 3 wasp traps in the back yard, 2 that I purchased and one that I made. So far the traps have caught 5 yellow jackets, and I haven't seen the large number of dead bees in front of the hive today. Question, how many dead bees would be normal? I assume that 30 / day is far to many?