What caused Patterson onions to rot from the top down?
Thrips ruined our Gladiolus entirely. The Patterson onions that were growing nearby looked healthy. We harvested the onions and placed them for storage in the cool cellar. Now it seems, 100% of the bulbs are rotting from the top down. The Ebenezers seem unaffected. What is the issue?
I’m very sorry to hear about the trouble with your onions!
Regarding the rot, you can find disease management advice in this fact sheet from Utah State Univ and this one from Ohio State, but you will largely be focused on crop rotation (if you have the space in your garden), complete disposal of dead plant material, and careful attention to drying the bulb necks at harvest. There are some chemical options available, as well. Regrettably, there aren’t really any neck rot-resistant cultivars or varieties of onions to switch to.
I wish I had happier news for you, but it sounds as though at least your Ebenezers should pull you through the disheartening loss of the Pattersons.