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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
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 .
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.
The Azalea Society of America designated Houston, Texas, an "azalea city". [citation needed] The River Oaks Garden Club has conducted the Houston Azalea Trail every spring since 1935. [citation needed] Valdosta, Georgia is called the Azalea City, as the plant grows in profusion there. The city hosts an annual Azalea Festival in March.
Included are a series of definitions of terms, crown shape, crown density/foliage transparency, un-compacted live crown ratio, vigor class, and various dieback evaluations. Crown density is the amount of crown branches, foliage and reproductive structures that blocks light visibility through the crown.
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.
Botryosphaeria corticola can be managed in high value trees, but there is no current management for forest trees.Carbendazim and thiophanate-methyl have shown to prevent infection in cork oak in Europe, where it is applied after cork has been harvested.
Exobasidium vaccinii, commonly known as “red leaf disease,” or “Azalea Gall,” is a biotrophic species of fungus that causes galls on ericaceous plant species, such as blueberry and azalea (Vaccinium and Rhododendron spp.). Exobasidium vaccinii is considered the type species of the Exobasidium genus. [1]