Tom I had the same thing around 12 years ago and it hit both my onions and garlic. I lost almost my whole crop. It returned the next year and I sprayed with the diluted bleach spray and stopped the worst of it before it got too bad again. I did notice that it started soon after or during periods of heavy rain with lots of splash back. I now make sure my onions are heavily mulched with bark fines or cypress mulch and it hasen't happened again. I also now spray my onions with Daconil a few times and with the diluted bleach spray if I am spraying anything else with it. I also will spray them with a copper spray if I am using that on something else.
I feel for you because it was a horrible experience for me and turned my beautiful bed of garlic and onions into a stinking mess. Hopefully you won't have it as bad as I did. It seemed like the plants just melted and became a soupy, rotting, slimy mess.
Good luck.
Bill
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