See Update: Coexisting With Wasps
Late summer and early fall is wasp season in Berlin; and, according to scientists, 2014 is going to be a banner year for this pesky insect. A mild winter and warm spring have contributed to their increased numbers. Wasps can be particularly troublesome at outdoor cafes.
The best way to prevent unpleasant encounters with social wasps is to avoid them. If you know where they are, don't go near their nesting places. Wasps can become very defensive when their nest is disturbed. If you can't avoid them, stay out of their way and move to another location. A wasp sting can be painful, and for some people, it can be deadly.