Seasonal development
and life cycle—Blue mold rot
Many species of Penicillium can cause blue mold. The fungi are common on plant debris and senescent
plant tissue. Invasion of onion bulbs and garlic is usually through wounds, bruises, or uncured neck tissue.
Once inside the bulb, the fungus grows through the fleshy scales, eventually sporulating profusely on
the surface of lesions and wounds. Optimum conditions include moderate temperatures and high relative
humidity.
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Invasion
of garlic bulbs causes stunting
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