Nothing messes up a picnic or day at the playground faster than unwanted guests like yellowjackets.
In fruit orchards, yellowjackets can be more than just pests. They can interfere with picking the ripe fruit. No one wants to work in the trees if they're constantly getting stung. If an orchard worker accidentally bumps into a nest, hundreds of the insects might try to sting the worker to defend their nest. And a small number of people can get very sick if a bee, wasp or yellowjacket stings them.