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P. destructor causes a wide range of symptoms in onions. From afar, downy mildew of onions can be detected by patches of yellowed plants incapable of growing to the size of surrounding healthy plants. Leaves: When looking at individual leaves, necrotic spots begin as yellowing spots that eventually turn brown or black as the leaf tissue dies. [5]
The onion thrips is a vector of certain plant viruses, including iris yellow spot tospovirus, strawberry necrotic shock virus, tobacco streak virus and tomato spotted wilt virus. [1] It is also a vector of Alternaria porri , which causes the fungal disease known as purple blotch.
Red onions (also known as purple or bluehi onions in some mainland European countries) are cultivars of the onion (Allium cepa), and have purplish-red skin and white flesh tinged with red. They are most commonly used in cooking, but the skin has also been used as a dye .
Ditylenchus dipsaci is a plant pathogenic nematode that primarily infects onion and garlic. [2] It is commonly known as the stem nematode, the stem and bulb eelworm, or onion bloat (in the United Kingdom). [3] [4] Symptoms of infection include stunted growth, discoloration of bulbs, and swollen stems.
Allium praecox is a species of wild onion known by the common name early onion. ... Anthers are purple or yellow; pollen yellow. [1] [3] [4] [5] References
Stemphylium solani is of greatest concern in tomatoes, potatoes, peppers, garlic, onions, and cotton, though a wide range of over 20 species have proven susceptible. In tomatoes and potatoes, the resulting disease is known as grey leaf spot. In alliums it is known as leaf blight. Additional hosts are listed below. [1] Onion, Allium ascalonicum
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An onion (Allium cepa L., from Latin cepa meaning "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus Allium. The shallot is a botanical variety of the onion which was classified as a separate species until 2011.