As soon as the temps warm up here in eastern Washington they start coming out on my farm. I used to buy a case of the 20 foot shooting foam spray. And then one spring we had a pair of barn swallows nest under my back porch. Of course they are very messy and we tried shooing them away but then I noticed I didn’t have near the number of wasps at my back porch. Today we eagerly await the swallows arrival, we now have several nesting pairs, and I only buy 1 can of spray just for standby. They can flat wipe them stinging bastards out!
For every natural problem there is usually a natural solution................