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Juniperus sabina, the savin juniper or savin, is a species of juniper native to the mountains of central and southern Europe and western and central Asia, from Spain to eastern Siberia, typically growing at altitudes of 1,000–3,300 metres (3,300–10,800 feet).
Junipers are coniferous trees and shrubs in the genus Juniperus (/ dʒ uː ˈ n ɪ p ər ə s / joo-NIP-ər-əs) [1] of the cypress family Cupressaceae.Depending on the taxonomy, between 50 and 67 species of junipers are widely distributed throughout the Northern Hemisphere as far south as tropical Africa, including the Arctic, parts of Asia, and Central America.
Gymnosporangium sabinae is a species of rust fungus in the subdivision Pucciniomycotina.Known as pear rust, European pear rust, or pear trellis rust, it is a heteroecious plant pathogen with Juniperus sabina (savin juniper) as the main primary host and Pyrus communis (common pear) as the main secondary host.
Juniperus scopulorum is a small evergreen tree that in favorable conditions may reach as much as 20 metres (66 feet) in height. [4] However, on sites with little water or intense sun it will only attain shrub height, and even those that reach tree size will more typically be 4.6–6.1 metres (15–20 feet) tall in open juniper woodlands. [5]
Juniperus pseudosabina is variable in shape, growing as a shrub or small tree, reaching 1–10 metres (3 + 1 ⁄ 2 –33 feet) tall. The leaves are of two forms, juvenile needle-like leaves 4–8 millimetres (3 ⁄ 16 – 5 ⁄ 16 inch) long, and adult scale-leaves 1.3–2 mm long on shoots 1.5–2 mm thick.
The fungus infects new growth of juniper trees or shrubs, i.e. the seedlings or young shoots of mature trees. Infection begins with the germination of asexual conidia, borne from pycnidia, on susceptible tissue, the mycelia gradually move inwards down the branch, and into the main stem. Management strategies mainly include removing and ...