whiterot?

Hiya all! I have planted a load of aliums (I think this is the right name (im new to all this) garlic shallots and onions in a new bed, made this year, all from different sources, some I bought from gardening centre's others from supermarkets (garlic) they are all growing well and very green, planted in early April. My worry is some of the garlic has turned yellow and I am concerned about whiterot, its the first leaf on the stem that seems to be turning yellow first (lowest) and I am concerned it may infect the whole bed. The bed is made from some compost that I have made myself and have included onion peelings in that compost that I wont do again, my quandary is do I pull these up and remove soil just in case or soldier on and see what occurs, I don't have visible white mould on the bulbs (I have pulled a few) but there is clearly something occurring with these two rows that isn't happening to the others. I plan to be self reliant on home grown veg and onions will be a principal crop so don't want to risk leaving and infecting the whole bed if its whiterot and will spread? Help!
Kindest regards,
Dan
Posts
Garlic is prone to viral diseases which is why it's best to buy cloves from garden suppliers rather than supermarkets when growing them. I agree, the problem should not affect the other alliums in the bed.
ok thanks guys - do I pull; or leave and do I need to remove the soil around any diseased plants - what I have read about white rot seems to indicate that that its a right drama and soil needs cleaning with jeyes fluid etc.. or do we think its not whiterot? Wont use supermarkets again for garlic, I only tried it to see if there was any difference; think I have an answer!
Pull one and have a look - if it looks like these images:
https://www.google.co.uk/search?q=white+rot+garlic&biw=1206&bih=650&tbm=isch&tbo=u&source=univ&sa=X&ei=d41XVayuMbGd7gb254CwBw&sqi=2&ved=0CCUQsAQ
it's white rot and I would pull them all. If the cloves look normal it is likely a virus and those don't survive in the soil as they need living plants to survive, so there would be no need to treat the soil.