I have a watermelon growing in a large 5 gallon container.. All the upper leaves on the stem died out real quickly.. I wasn't over watering and haven't been over fertilizing.. It's in a container that has one of those watering trays at the bottom, so I pull the tray off and out came a billion ants. I lift the container up and I see what looks like some mushrooms growing out the bottom... not sure if the ants were feeding on those or the roots but something is killing this plant.
Any thoughts of what might have caused this? It's not totally dead, just it's severely damaged..
https://goo.gl/photos/BcALoZSwC8PmoyW17