Diseases and Pests of Garlic 2/12 Vegetable rot due to Penicillium, Mucor, or Rhizopus species
Vegetable rot only occurs on garlic when bulbs have been compromised by mechanical damage or another disease. The former is often caused by
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harvesting or processing tools such as undercutters or garlic poppers,
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too long garlic stems poking into neighboring bulbs during storage or transport,
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human rough-handling such as throwing or dropping bulbs.
The three most frequent (because they are omnipresent) fungal genera causing vegetable rot are called Penicillium, Mucor, and Rhizopus. When vegetable rot is caused by Penicillium species it is known as “Penicillium decay” or “blue mold” for its blue-green mold.

Vegetable rot almost always sets in sooner or later when there is damage to the cloves, be it caused mechanically or by another disease or organism discussed below. An essential skill in determining diseases on garlic is therefore knowing the symptoms of vegetable rot and being able to tell them apart from what other symptoms are present so as not to draw incorrect conclusions about the presence of the so-called “white rot,” for instance.
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