Knowledgebase
Yellow squash #877096
Asked July 13, 2024, 2:14 PM EDT
Denver County Colorado
Expert Response
Without a picture, it is hard to diagnose, but because of the location you describe, I suspect blossom end rot. The following document describes causes and solutions.
https://planttalk.colostate.edu/topics/insects-diseases/1471-blossom-end-rot/