White Lettuce is firmly identified with Common lettuce, Lactuca sativa. The larvae feed on various herbaceous plants, including "Taraxacum officinale", "Lactuca sativa", "Polygonum aviculare". Lettuce ("Lactuca sativa") is an annual plant of the daisy family, Asteraceae. This microorganism causes a disease of lettuce ("Lactuca sativa") denominated as downy mildew. Its best-known representative is the garden lettuce ("Lactuca sativa"), with its many varieties. It is the closest wild relative of cultivated lettuce ("Lactuca sativa" L.).