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Beech bark disease is a disease that causes mortality and defects in beech trees in the eastern United States, Canada and Europe. [1][2][3] In North America, the disease occurs after extensive bark invasion by Xylococculus betulae and the beech scale insect, Cryptococcus fagisuga. [4] Through a presently unknown mechanism, excessive feeding by ...
Epidermodysplasia verruciformis (EV) is a skin condition characterised by warty skin lesions. [ 1 ] It results from an abnormal susceptibility to HPV infection (HPV) and is associated with a high lifetime risk of squamous cell carcinomas in skin. [ 1 ] It generally presents with scaly spots and small bumps particularly on the hands, feet, face ...
Oak wilt is a devastating exotic disease, killing some trees rapidly in a single season. [ 7 ] Oak wilt is an important disease in urban areas where trees are highly valued. The disease reduces property values because of the loss of trees and is economically costly to the property owner since they or the local government must pay for tree removal.
Dutch elm disease. Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Believed to be originally native to Asia, the disease was accidentally introduced into America, Europe, and New Zealand. In these regions it has devastated native populations of elms that did not ...
Collar rot is a symptomatically described disease that is usually caused by any one of various fungal and oomycete plant pathogens. It is present where the pathogen causes a lesion localized at or about the collet between the stem and the root. The lesions develop around the stem eventually forming a "collar". Observationally, collar rot grades ...
Armillaria root rot is a fungal root rot caused by several different members of the genus Armillaria. The symptoms are variable depending on the host infected, ranging from stunted leaves to chlorotic needles and dieback of twigs and branches. However, all infected hosts display symptoms characteristic of being infected by a white rotting fungus.
Phomopsis juniperovora. G.G.Hahn. Phomopsis blight of juniper is a foliar disease discovered in 1917 [1] caused by the fungal pathogen Phomopsis juniperovora. The fungus infects new growth of juniper trees or shrubs, i.e. the seedlings or young shoots of mature trees. Infection begins with the germination of asexual conidia, borne from pycnidia ...
Citrus greening was first found in 2005 in the US and has cut the Orange tree production in half [2][3] Citrus greening disease or yellow dragon disease[4] (calque of Chinese: 黃龍病; pinyin: huánglóngbìng abbr. HLB) [5] is a disease of citrus caused by a vector -transmitted pathogen. The causative agents are motile bacteria, Liberibacter ...