In late summer, honey bees become more defensive of their colony's resources during this time, and strong colonies may start robbing smaller or weaker ones. Many aspects of a honey bee colony are cyclical in nature, and aggressiveness is no exception. Honey bees can become belligerent at any time, but there are certain things that cause them. In late summer and early fall, more of these conditions exist.
Nowadays, the bees from the first swarm hive are in a rather aggressive mood (not as bad as Jon's, but bad enough). Bees will defend their honey reserves, but if you're not kind to the way you take it, they can become even more defensive. Susan, in my little story about urban beekeeping, I mentioned that one day bees got hooked on the hair of my next door neighbor. If it's very close to your house, you might get stung from time to time, but those of us who love bees only tolerate occasional annoyances.
Before learning how to deal with aggressive honey bees, it would be useful to learn about the causes of these changes in bee aggression. Bees have evolved to recognize their predators as predominantly dark-colored animals, such as bears and skunks. So the other afternoon was a nice, warm spring day and I knew that the bees were bringing a lot of pollen. I'm worried that he'll lose his new queen, but that he'll be left with who knows how many bees if he has to take them all out.
We had a very mild winter here in Virginia Beach, Virginia, and the bees have been collecting pollen for quite some time. Africanized bees, on the other hand, can be quite unpleasant when they are swarming and chasing long distances and attacking. When I was just starting out with bees (see my posts at the beginning of this thread), after each inspection, the bees patrolled my backdoor for days.