OK- so I went to my hive today and I saw more dead bees near the front- and some bees half alive on the ground.... then I saw a wasp back hunting... I killed it and was able to positively identify it as a European Wasp. Nasty little beast:
The bees I saw struggling on the ground- is it likely they have been stung by the wasp? Do bees recover from a wasp sting?
Other than reducing the entrance is there anything else I can do?
Traps with vinegar and honey? I am worried there is a large colony nearby and they have targeted my hives for robbing.
Edit: Again I couldn't wait- I put out a trap with a little vinegar and cat food mush. Looking in front of the hive there are more dead and dying bees. Also the hive has become more defensive with guard bees buzzing at my face. The dying bees are just moving slowly on the ground- they appear to be in good condition and not all old worn out bees. Is this the result of wasp stings?? Maybe something else is going on.