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Sp661 Bacterial Leaf Scorch In Landscape Trees, The University Of Tennessee Agricultural Extension Service
Sp661 Bacterial Leaf Scorch In Landscape Trees, The University Of Tennessee Agricultural Extension Service
Forestry, Trees, and Timber
Bacterial leaf scorch is a chronic disease caused by a bacterium, Xylella fastidiosa, that grows in the xylem of the tree and physically clogs these water-conducting vessels. As the bacterium multiplies, water transport becomes more limited. The tree suffers water stress, especially in mid to late summer, resulting in leaf scorch; a browning or discoloration of the margins of the leaves with interior portions of the leaves near the veins remaining green. The bacterium is spread by leafhoppers, spittlebugs and other xylem-feeding insects.
Sp631 Bacterial Wetwood Disease Of Trees, The University Of Tennessee Agricultural Extension Service
Sp631 Bacterial Wetwood Disease Of Trees, The University Of Tennessee Agricultural Extension Service
Forestry, Trees, and Timber
Wetwood is a water-soaked condition of wood in the trunk and branches of trees. This condition has been attributed to bacterial infection in the inner sapwood and outer heartwood area of the tree. Infection is normally associated with wounding or environmental stress on the tree. The bacteria, Enterobactor cloacae, has been implicated as the cause of wetwood in elm, but numerous other bacteria have been associated with this condition in other trees such as cottonwood, willow, ash, maple, birch, hickory, beech, oak, sycamore, cherry and yellow-poplar. Bacteria alter wood cell walls, causing moisture content of the wood to increase. …
Sp546 Diseases Of Shade And Ornamental Trees, The University Of Tennessee Agricultural Extension Service
Sp546 Diseases Of Shade And Ornamental Trees, The University Of Tennessee Agricultural Extension Service
Forestry, Trees, and Timber
Shade trees and small ornamental trees may be affected by plant diseases. Most are simply aesthetic problems and cause no long-term damage to the tree. Some diseases can seriously disfigure trees, while others are lethal.