I’m sorry but your photo does not have a high enough resolution to tell what these insects are. Many insects specialize and wouldn’t probably eat plums apples and hardy kiwis. 

Can you get a better photo?

Hello again,

A colleague of mine steered me to the Flatheaded apple borer as a possible suspect here. 

You best response to these is to do proper clean up around the tree and to make sure it gets consistent watering. That hasn’t been a problem this spring but we may be going into a dry spell. 

https://extension.uga.edu/publications/detail.html?number=C1261&title=flatheaded-appletree-borer-a-pest-of-trees-in-nurseries-and-landscapes