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Thuja occidentalis, also known as northern white-cedar, [1] eastern white-cedar, [2] or arborvitae, [2] [3] is an evergreen coniferous tree, in the cypress family Cupressaceae, which is native to eastern Canada and much of the north-central and northeastern United States. [3] [4] It is widely cultivated as an ornamental plant.
Important diseases: Pestalotiopsis tip blight of conifers, Gray leaf spot Pestalotia is primarily a secondary pathogen. It is saprophytic on dead and dying tissues and is weakly parasitic infecting wounds under moist conditions. Tips of conifer branches particularly Leyland cypress, arborvitae and juniper turn brown to grayish in color.
Thuja species are used as food plants by the larvae of some Lepidoptera species including autumnal moth, the engrailed and juniper pug. The foliage is also readily eaten by deer , and where deer population density is high, can adversely affect the growth of young trees and the establishment of seedlings.
Thuja plicata is a large evergreen coniferous tree in the family Cupressaceae, native to the Pacific Northwest of North America. Its common name is western redcedar in the U.S. [2] or western red cedar in the UK, [3] and it is also called pacific red cedar, giant arborvitae, western arborvitae, just cedar, giant cedar, or shinglewood. [4]
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Thujopsis is a medium to large evergreen tree, reaching up to 40 m tall and 1.5 m trunk diameter, with red-brown bark which peels in vertical strips.The leaves are arranged in decussate pairs, scale-like, 3–10 mm long, glossy green above, and marked with vivid white stomatal bands below; they have a distinctive thick, almost fleshy texture.
Platycladus is a monotypic genus of evergreen coniferous trees in the cypress family Cupressaceae, containing only one species, Platycladus orientalis, also known as Chinese thuja, [5] Oriental arborvitae, [6] Chinese arborvitae, biota or Oriental thuja.
In fact, forests of these species represent some of the most valuable land for timber harvest in the US, as they fetch a premium price over related species. [7] While species such as whitebark pine ( Pinus albicaulis ) and limber pine ( Pinus flexilis ) are of less economic importance, they too are affected by Cronartium ribicola, as well as ...