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Birch dieback is a disease of birch trees that causes the branches in the crown to die off. The disease may eventually kill the tree. In an event in the Eastern United States and Canada in the 1930s and 1940s, no causal agent was found, but the wood-boring beetle, the bronze birch borer, was implicated in the severe damage and death of the tree that often followed.
Despite this, the borers can still damage the trees if they are weakened by other means. Between about 1930 and 1950, many gray birch trees, along with paper birch and yellow birch (Betula alleghaniensis), were weakened by birch dieback disease, which allowed for the bronze birch borer to attack and kill the trees. [11]
Witch's brooms on downy birch, caused by the fungus Taphrina betulina Witch's broom on a white pine. Witch's broom in Yamaska National Park, QC. Witch's broom or witches' broom is a deformity in a woody plant, typically a tree, where the natural structure of the plant is changed.
Betula cordifolia is a deciduous tree that reaches heights of about 60 feet or 25 m and a trunk diameter of about 30 inches or about 75 cm. [3] Mature bark is white or bronze-white, peeling in thin layers.
Because this disease is caused by multiple species within the genus Armillaria, it has an extremely broad host range. Hundreds of trees and shrubs are susceptible to root rot to varying degrees. In fact, the only two genera of tree known to be resistant to Armillaria root rot are larch and birch. Further investigation is being conducted for ...
Effect of leafminers in birch leaves. Birch leafminers are sawflies, which are closely related to bees and wasps. They are among the most common insect pests affecting birch trees (Betula spp.) in North America. The primary species affecting birch trees in North America are Profenusa thomsoni and Fenusa pumila.
Trametes betulina (formerly Lenzites betulina), sometimes known by common names gilled polypore, birch mazegill or multicolor gill polypore, is a species of inedible fungus. [ 1 ] The caps are 2.5–8 centimetres (1–3 in) wide. [ 2 ]
Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... Pages in category "Tree diseases" The following 33 pages are in this category ...