This summer I had what at first I thought was blossom end rot based on growing tomatoes, but upon close inspection found a little worm looking thing, break them up and soak in
water and see if you find any, they would drown and come out of the little squashes if broke apart (not cut) and soaked. After that when I see one rotting at the blossom end I run thru garbage disposal and
feed to septic system. got to where the was little problem after a while. I hate how often I breed bad bugs and don't even know it...like thinking I had assassin bugs to find they were stink bugs...live and learn