It is my understanding that insects are attracted to the source of minerals in urine, and they come to visit the urine, even diluted, of my dogs tested to NOT spill glucose. Carpenter bees seem to be attracted most in the spring to dog or fox urine. Nature doesn't waste anything!

I feel your pain. My hubby has about 6 or 7 hives on our property. The bees seem to seek out moisture at the dog runs when it is dry and hot.....really makes you want to eat a little honey, huh! After a sting or two, my guys have learned to leave them alone.