Crinivirus: A genus of plant viruses in the family CLOSTEROVIRIDAE. Transmission is by whiteflies. Lettuce infectious yellows virus is the type species.Ipomoea batatas: A plant species of the genus IPOMOEA, family CONVOLVULACEAE. Some cultivars are sweet and edible whereas bitter varieties are a source of SAPONINS. This sweet potato is sometimes referred to as a yam (DIOSCOREA).Lettuce: Any of the various plants of the genus Lactuca, especially L. sativa, cultivated for its edible leaves. (From American Heritage Dictionary, 2d ed)Cucumis: A plant genus of the family CUCURBITACEAE, order Violales, subclass Dilleniidae best known for cucumber (CUCUMIS SATIVUS) and cantaloupe (CUCUMIS MELO). Watermelon is a different genus, CITRULLUS. Bitter melon may refer to MOMORDICA or this genus.Potyvirus: A large genus of plant viruses of the family POTYVIRIDAE which infect mainly plants of the Solanaceae. Transmission is primarily by aphids in a non-persistent manner. The type species is potato virus Y.Plant Diseases: Diseases of plants.Genome, Viral: The complete genetic complement contained in a DNA or RNA molecule in a virus.RNA, Viral: Ribonucleic acid that makes up the genetic material of viruses.