Apium virus Y sea celery ("Apium prostratum"), cilantro ("Coriandrum sativum"), and bishop’s weed ("Ammi majus"). In Germany it has recently been found naturally infecting celeriac or celery root. All are members of the plant family "Apiaceae". Symptoms reported included mosaic, vein clearing or banding, necrotic/chlorotic line patterns and stunting. Some samples of parsley, celery and poison hemlock, that gave positive results in tests, however, were asymptomatic. In host range studies, the virus causes local lesions on "Chenopodium quinoa" and "C. amaraticolor" ("Amaranthaceae"). Apium virus Y "Apium virus Y" (ApVY) is a plant pathogenic virus in the genus "Potyvirus" and the virus family "Potyviridae".
Celery to the season of the year, and, after one or two thinnings and transplantings, they are, on attaining a height of , planted out in deep trenches for convenience of blanching, which is effected by earthing up to exclude light from the stems. In the past, celery was grown as a vegetable for winter and early spring; it was perceived as a cleansing tonic, welcomed to counter the deficiencies of a winter diet based on salted meats without fresh vegetables. By the 19th century, the season for celery had been extended, to last from the beginning of September to late