yellow jacket nests

[sewmadd]

I had a bad problem with yellow jackets making nests in the base of my earth boxes and they ate all of the strawberries.  How can I keep that from happening again?  Has anybody here had that problem and if so how did you address it?

[gardendoc]

I've been growing in EBs for over 10 years and have never seen any yellowjackets or wasps build nests at the EB base. Black and brown widow spiders, yes.