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Forest dieback (also "Waldsterben", a German loan word, pronounced [ˈvaltˌʃtɛʁbn̩] ⓘ) is a condition in trees or woody plants in which peripheral parts are killed, either by pathogens, parasites or conditions like acid rain, drought, [1] and more.
Phomopsis dieback Phomopsis spp. Phyllosticta leaf spot Phyllosticta spp. Phytophthora blight and dieback Phytophthora nicotianae var. parasitica = Phytophthora parasitica. Phytophthora root rot and wilt Phytophthora cinnamomi Phytophthora nicotianae var. parasitica. Powdery mildew Erysiphe polygoni Microsphaera penicillata. Pucciniastrum leaf rust
Epicormic shoots sprouting vigorously from epicormic buds beneath the bushfire damaged bark on the trunk of a Eucalyptus tree. An epicormic shoot is a shoot growing from an epicormic bud, which lies underneath the bark of a trunk, stem, or branch of a plant.
Twig dieback also starts apically and works towards the center of the plant. It is characterized by a slow necrosis of the branch, leaving large, dead limbs on the upper portions of trees. [2] Under the microscope, it can be identified by its immersed, pyriform perithecia (pear-shaped, spore-containing structures), which have a brown exterior wall.
Dieback may refer to a number of plant problems and diseases including: Forest dieback caused by acid rain, heavy metal pollution, or imported pathogens; The death of regions of a plant or similar organism caused by physical damage, such as from pruning; Those caused by the genus Eutypa, such as Eutypa dieback
Dieback is characterized as a ‘dead arm’ and a loss of spur positions. More symptoms include stunted shoots in the spring, delay or lack of growth in the spur positions of the bud burst, bleached canes and necrotic buds. Bud necrosis, bud failure, and the dieback of arms are all a result of the necrosis of the host's vascular system. [9]
Ovulinia petal blight is commonly referred to as Ovulinia flower blight, Azalea flower blight, and Azalea flower spot. [1] First reported in the 1930s on the Belgian-Indica hybrids, petal blight can attack most azaleas under favorable weather conditions. Infected flowers first exhibit small spots, about 1 mm in diameter, which appear water ...
Hymenoscyphus fraxineus is an ascomycete fungus that causes ash dieback, a chronic fungal disease of ash trees in Europe characterised by leaf loss and crown dieback in infected trees. The fungus was first scientifically described in 2006 under the name Chalara fraxinea .