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Downy Mildew on onions and shallots


Anybody out there know how to control downy mildew on onions and shallots?  For the second year running I've been afflicted in this way - no doubt due to wet and mild weather.  The shallots, I've lifted.  The onions are not ready.  They've had prophylactic spraying with Diathane 945 and post-symptom spraying but to no effect.  The onions have not collapsed yet but they have all the symptoms.  What to do?
 
Also, rust on garlic.  This crop is supposed to be trouble free but this year there has been more rust than green.  Will the bulbs store?
 
Any suggestions gratefully received.


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