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Although it is a sweeter and less pigmented variant of the redcurrant, not a separate botanical species, it is sometimes marketed with names such as R. sativum or R. silvestre, or sold as a different fruit. Currant bushes prefer partial to full sunlight and can grow in most types of soil. [11]
The characteristic leaf symptoms are a smaller number of leaf lobes and a decrease in the number of teeth on the serrated edge of the leaves. The flowers also show symptoms, with the buds being less hairy than normal and, in a severe form of the disease present in Russia and Scandinavia, the sepals appearing to be doubled in number to ten. [ 4 ]
Ribes (/ ˈ r aɪ b iː z /) [5] is a genus of about 200 known species of flowering plants, most of them native to the temperate regions of the Northern Hemisphere. [2] The species may be known as various kinds of currants, such as redcurrants, blackcurrants, and whitecurrants, or as gooseberries, and some are cultivated for their edible fruit or as ornamental plants.
Ribes triste, known as the northern redcurrant, [2] swamp redcurrant, or wild redcurrant, [3] is an Asian and North American shrub in the gooseberry family. Description [ edit ]
The flowers are produced in early spring at the same time as the leaves emerge, on dangling racemes 3–7 cm (1–3 in) long of 5–30 flowers; each flower is 5–10 millimetres (1 ⁄ 4 – 3 ⁄ 8 in) in diameter, with five red, pink, or white [6] petals. The fruit is a dark purple oval berry about 1 cm (3 ⁄ 8 in) long; it has an insipid ...
The blackcurrant sawfly (Nematus ribesii) lays its eggs on the underside of the leaves and the voracious larvae work their way along the shoots, stripping off leaf after leaf. In a serious attack, the bush can be denuded of leaves. Larvae of the currant borer drill their way along the centres of shoots, which wilt and die back.
Because the infection moves from currant plants, to pines, and back again, it cannot continue to exist without its secondary host. Although effective in theory, removal of currants is rarely successful in practice, as they readily re-grow from small pieces of root left in the soil, and the seeds are very widely spread in birds' droppings.
Seed transmission incidence can be different among different species or varieties of hosts; [9] host factors that control viral seed transmission, however, are unknown. Cross pollination with PNRSV infected pollen to healthy plants has shown that the virus can also infect the fruit and not just seeds.