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Carrot virus Y (CarVY) is a (+)ss-RNA virus that affects crops of the carrot family , such as carrots, anise, chervil, coriander, cumin, dill and parsnip. [1] Carrots are the only known crop to be infected in the field. Infection by the virus leads to deformed roots and discolored or mottled leaves.
Parsnip leaves are sometimes tunnelled by the larvae of the celery fly (Euleia heraclei). Irregular, pale brown passages can be seen between the upper and lower surfaces of the leaves. The effects are most serious on young plants, as whole leaves may shrivel and die. Treatment is by removing affected leaflets, whole leaves, or by chemical means ...
The virus specifically targets carrots, parsnips, and cilantro but only effects carrot as this is the only host for the vector. This virus alone does not cause symptoms in carrots, but in connection with Carrot red leaf virus (CRLV) causes yellowing, reddening of leaves and yield loss.
In systematic virus infections leaf spots caused by viruses show a loss of green colour in leaves, due to chlorosis which is a repression of chlorophyll development. [1] Leaves may yellow and have a mottled green or yellow appearance, show mosaic (e.g. chlorotic spotting) and ringspots (chlorotic or necrotic rings). [ 7 ]
Common scab is a plant disease of root and tuber crops caused by a small number of Streptomyces species, specifically S. scabies, S. acidiscabies, S. turgidiscabies and others. Common scab mainly affects potato ( Solanum tuberosum ), but can also cause disease on radish ( Raphanus sativus ), parsnip ( Pastinaca sativa ), beet ( Beta vulgaris ...
Sequivirus is a genus of viruses in the order Picornavirales, in the family Secoviridae.Plants serve as natural hosts. There are three species in this genus. Diseases associated with this genus include: PYFV: vein-yellowing, yellow flecks and yellow/green mosaic symptoms in parsnip, and ‘yellow net', followed by yellow spots and leaf distortion in celery.