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Peronospora destructor is a plant pathogen. It causes downy mildew on leaves of cultivated and wild Allium. Allium cepa (onion and shallot) is most often affected, while Allium schoenoprasum (chives) and Allium porrum (leek) are only occasionally affected. Downy mildew is a major disease of onion. [1]
Bolting begins; in 10% of the plants leaves bent over 3. 70% of the expected shaft length and diameter reached 4. 48: 408: Leaves bent over in 50% of plants 3: 49: 409: Leaves dead, bulb top dry; dormancy 3. Growth complete; length and stem diameter typical for variety reached 4. 5: Inflorescence emergence 51: 501: Onion bulb begins to elongate ...
Crinum thaianum, also called the Thai onion plant or water onion, is an emergent plant species, endemic to the coastal plain of Ranong and Phang Nga Provinces, Thailand. [2] Its natural habitat is to grow along the banks of flowing, medium- to fast-running streams, where its roots and bulb are submerged in the sediment, while its leaves grow long in the current and can access fresh air at the ...
The tree onion (Allium × proliferum) is a perennial plant similar to the common onion (A. cepa), but with a cluster of bulblets where a normal onion would have flowers. Tree onions are also known as topsetting onions , walking onions , or Egyptian onions .
Allium vineale (wild garlic, onion grass, crow garlic or stag's garlic) is a perennial, bulb-forming species of wild onion, native to Europe, northwestern Africa and the Middle East. [2] The species was introduced in Australia and North America , where it has become an Invasive species .
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.
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The onion plant (Allium cepa), also known as the bulb onion [2] or common onion, [3] is the most widely cultivated species of the genus Allium. [4] [5] It was first officially described by Carl Linnaeus in his 1753 work Species Plantarum. [6] Synonyms during its taxonomic history are: [7] [8] Allium cepa var. aggregatum – G. Don