I have 2 beehives in my friends backyard. We've recently noticed that the bees have been more aggressive then usual. This is the only apiary I have to wear gloves at and the bees have been very defensive, they buzz at people that come within 15 feet of the hives.

An option is the re-queen the hives with a more gentle queen bee, but these bees have been doing great. Both hives have survived the last 3 years (treatment free) and produce quite a bit of honey. I was thinking of going to Home Depot and buying a 6ft tall bamboo fence to make a barrier between the bees and my friends backyard lawn. Will the bees be less aggressive, if they can't see anyone on the other side of the fence? or does anyone have any suggestions?

Thank you,