My out-apiary is under sustained attack from wasps.
There are dozens around the apiary. They concentrate their attention on the weakest hives. This has turned out to be hives F and H.
Poor hive H is getting a kicking. I initially put the frames of brood at the back. That was a mistake. The bees did not adequately guard the entrance and this set up the cycle of attack and robbing. I found a large number of bee heads and legs. The bodies will have been eaten - presumably by wasps because I haven't seen any hornets. I moved the frames to the front of the hive and reduced the entrance to about 1cm wide. That stopped the build up of bee body parts. It hasn't stopped the robbing. I saw a wasp enter the hive without being challenged during the 5 minutes that I was watching (near 9pm when the flying bees should have been home).
What to do now? I would like to move the hive away from the wasps but I don't really have space to put hive H at home. I could set up a wasp trap but it won't stop the robbing. I could reduce the entrance way even more but that's pointless if they're not guarding.