Wasps have much stronger mandibles than honeybees and thanks to that they can penetrate the hard fruit skin. Once the fruit is opened the honeybees can also part take in feeding on the fructose sugar from the fruits.Wasps are very beneficial in the nature. In my locality they are the ones pollinating Black Currants, they feed on pest insects and they provide food for the honeybees by opening the fruits with their strong mandibles.
I have planted a small patch of Calendula in our garden which is blooming now. Bees work Calendula flowers readily. Im soon to start preparing a large area for our kitchen garden and there I will plant lots of Calendula, Asters, Borage and other bee friendly plants.