I had never even heard of this being a problem -- but apparently it is mainly in the PNW here in the US ?
These articles seem to have pretty good information, but it doesn't sound too hopeful to me
http://pnwhandbooks.org/plantd...
http://homeguides.sfgate.com/n...
Sherrill, I would suggest contacting the Extension Service in your county -- someone there should be knowledgeable about this garlic disease. I really hope you can find some answers and be able to continue to grow garlic. I wonder if using drip irrigation and planting through small holes in a layer of plastic or landscape fabric (to keep soil from being splashed up onto the plants), in a planter filled with fresh soil, would be helpful -- ?