Mayo Clinic Minute: Does one moldy berry spoil the whole bunch?

Berries especially can develop a white coating on them that kind of looks like cotton or fuzz. A few moldy berries don't mean you have to throw out the whole batch.

Dr. Rajapakse says to throw out the ones that look visibly moldy as well as any that might have been in direct contact.

If you don't notice the mold until you've already started eating, Dr. Rajapakse says there's no need to panic.

To keep your berries fresher and mold-free longer, rinse them with vinegar and water, and store them on a dry paper towel in an open container in your fridge.
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