Zipcode I'm sorry to hear that! What are the viruses that affect garlic in your area? How do they spread to your shallots?
I have looked at all the pics online about different allium viruses. I have seen that some garlic dries down streaky, and looks like some of those pics. I was worried about this when I first started to grow garlic, but I've never seen those "symptoms" spread from one type to another in the field.
I heard it was spread by aphids but I've never seen aphids on alliums here. I have every kind of insect in my garden here, as we never used pesticide ever. I've seen plant hopper bugs on the garlic, and 'spit bugs' that are always hidden in a bit of foam (really a lot of them this year), and even a moth or two on the garlic might have chewed something, small flies perhaps... but I never see a sign of disease transmission. Please tell me more.