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Laminated root rot also known as yellow ring rot is caused by the fungal pathogen Phellinus weirii. Laminated root rot is one of the most damaging root disease amongst conifers in northwestern America and true firs , Douglas fir , Mountain hemlock , and Western hemlock are highly susceptible to infection with P. weirii .
Root rot is a condition in which anoxic conditions in the soil or potting media around the roots of a plant cause them to rot. This occurs due to excessive standing water around the roots. [ 1 ] It is found in both indoor and outdoor plants, although it is more common in indoor plants due to overwatering, heavy potting media, or containers with ...
Clavibacter michiganensis, also known as Ring Rot, is an unusual genus of phytopathogenic bacteria in that it is gram-positive and does not have a type three secretion system. All Clavibacter species and subspecies have a type B2γ cell wall crosslinked at a diaminobutyrate residue. Clavibacter is an aerobic bacterium with a coryneform morphology.
Trichoderma ear rot and root rot Trichoderma viride = Trichoderma lignorum. Hypocrea sp. [teleomorph] White ear rot, root and stalk rot Stenocarpella maydis = Diplodia zeae: Yellow leaf blight Ascochyta ischaemi. Phyllosticta maydis Mycosphaerella zeae-maydis [teleomorph] Zonate leaf spot Gloeocercospora sorghi
It causes Armillaria root rot in many plant species and produces mushrooms around the base of trees it has infected. The symptoms of infection appear in the crowns of infected trees as discoloured foliage, reduced growth, dieback of the branches and death. The mushrooms are edible but some people may be intolerant to them.
Red ring rot is common in North America. The pathogen Porodaedalea pini is widely spread in the temperate zone in the Northern Hemisphere. [4] It infects a wide range of coniferous trees, including jack pine, lodgepole pine, Sitka and white spruce, Douglas-fir, balsam and true fir, western hemlock, and tamarack.
Symptoms of kauri dieback include root rot of both fine-feeder and larger structural roots; a collar rot lesion causing resin production ("gummosis") at the collar and lower trunk region; severe chlorosis and defoliation of the canopy; and overall crown decline. Infection by kauri dieback can rapidly kill seedlings and trees of all ages.
A milder infection of R. stolonifer occurring away from the ends results in ring rot or collar rot, in which the pathogen typically only causes rotting in a portion of the root. This rotting forms a relatively superficial dry ring around the root. [7] Rhizopus soft rot produces a characteristic fermentation odor. [2]