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Pine seedlings being bred to resist white pine blister rust by the US Forest Service Cronartium ribicola is a heteroecious, macrocyclic pathogen on Pinus spp and Ribes spp. [ 7 ] Because young pines are smaller and less developed than mature trees, they are most susceptible to the pathogen.
Scots pine, red pine, Mugo pine, Ponderosa pine, and Austrian pine are especially susceptible. Some spruce, fir, and cedar species are also vulnerable to infection. [ 3 ] The disease can infect trees of all ages, though trees that are physiologically stressed through water or nutrient deficiencies or wounded via extreme weather or insect damage ...
The cones are borne on a short stem, and have two to four scales, usually only one (sometimes two) fertile, each fertile scale bearing a single apical seed 10–15 mm. When mature, the scales swell up and become reddish purple, fleshy, and berry -like, 10–20 mm long; they are then eaten by birds , which disperse the seeds in their droppings.
Pinus mugo subsp. uncinata — in the west and north of the range (from the Pyrenees northeast to Poland), a larger, usually single-stemmed tree to 20 m (66 ft) tall with glossy-textured asymmetrical cones, the scales of which are much thicker on the upper side.
Dwarf mountain pine may refer to: Pinus mugo , also called creeping pine, a conifer native to high elevation habitats in Europe. Pherosphaera fitzgeraldii , also called Blue Mountains pine, is a critically endangered conifer species found only in New South Wales, Australia.
Mountain pine (Pinus mugo) is a species of pine tree. Mountain pine can also refer to: Botany. Mountain pine (Halocarpus bidwillii) Table mountain pine (Pinus pungens)
Mature Pinus pinea (stone pine); note umbrella-shaped canopy: Pollen cones of Pinus pinea (stone pine): A red pine (Pinus resinosa) with exposed rootsYoung spring growth ("candles") on a loblolly pine
Chionaspis pinifoliae, the pine needle scale insect, is a common species of scale insect found on pine, spruce and other conifers across Canada and throughout the United States. [1] The species is particularly persistent on planted spruce in the Prairie Provinces in both rural and urban settings.