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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.
Phytophthora ramorum is the oomycete known to cause the disease sudden oak death (SOD).The disease kills oak and other species of trees and has had devastating effects on the oak populations in California and Oregon, as well as being present in Europe.
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.
The five species in the genus Thuja are small to large evergreen trees with flattened branchlets. The leaves are arranged in flattened fan shaped groupings with resin-glands, and oppositely grouped in 4 ranks. The mature leaves are different from younger leaves, with those on larger branchlets having sharp, erect, free apices.
Cypress canker is a disease affecting Cupressus species, caused by one of several species of fungus in the genus Seiridium.Infection causes die-back of twigs and branches in susceptible cypress trees, [1] with rapidly increasing amounts of damage and the death of the tree.
In trees, heart rot is a fungal disease that causes the decay of wood at the center of the trunk and branches. Fungi enter the tree through wounds in the bark and decay the heartwood. The diseased heartwood softens, making trees structurally weaker and prone to breakage.