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Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Tar spot does not usually have an adverse effect on the trees' long-term health. [1] R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. [2]
Rhytisma punctatum is a species of fungus in the family Rhytismataceae.The fungus causes speckled tar spot of maple leaves. The small spots are black, raised from the leaf surface, and occur in dense groups on the upper surface.
Tar spot may refer to: Phyllachora maydis , a fungus species that cause tar spot disease of maize Rhytisma acerinum , a fungus species that causes tar spot disease of maples
A decade on from the arrival of the disease in the UK, the Woodland Trust wants to see action to boost British nurseries to protect our woods. ‘Real threat’ of importing new tree diseases as ...
Maple leaves in late summer and autumn are commonly disfigured by "tar spot" caused by Rhytisma species and mildew caused by Uncinula species, though these diseases do not usually have an adverse effect on the trees' long-term health. [17]
The spores are hyper-allergenic and cause a condition called maple bark stripper's disease, a hypersensitivity pneumonitis. [ 51 ] [ 52 ] Less serious is the fungus Rhytisma acerinum which often forms the disease known as tar spot, in which black spots with yellow margins form on the foliage.
The larvae emerge from eggs laid on the samara and tunnel to the seeds. Norway maple is generally free of serious diseases, though can be attacked by the powdery mildew Uncinula bicornis, and verticillium wilt disease caused by Verticillium spp. [30] "Tar spots" caused by Rhytisma acerinum infection are common but largely harmless. [31]
Rhytisma is a genus of fungi in the Rhytismataceae family [1] commonly known as 'tar spot'. There are about 18 species , [ 2 ] which live parasitically in the leaves of deciduous trees. Species