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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]
Fungal diseases; Anthracnose Sphaceloma menthae. Black stem rot Phoma strasseri. Leaf blight Cephalosporium sp. Phoma leaf spot Phoma exigua. Powdery mildew Erysiphe spp. Erysiphe cichoracearum. Ramularia leaf spot Ramularia menthicola. Rust Puccinia menthae Puccinia angustata. Septoria leaf spot Septoria menthae. Stem and stolon canker ...
The host-specific characteristic of many leaf spot pathogens makes diversity in plant species a way to reduce and regulate leaf spot pathogen infection levels within plant populations. [ 18 ] Prevention of leaf spot disease includes variety selection, crop rotations, plant hygiene and fungicide use for seeds and foliage. [ 19 ]
Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive. Infected plants display white powdery spots on the leaves and stems. [1] This mycelial layer may quickly spread to cover all of the leaves.
Most commonly Cephaleuros virescens is identified by the leaf spots it causes. Theses leaf spots are an orange-brown rust in color and usually occur entirely on the upper leaf surface, although leaf spots on the undersides of infected leaves have been reported. The spots are fuzzy in texture and approximately 2 cm (0.8 in) in diameter. [2]
Phyllosticta leaf spot Phyllosticta erratica Phyllosticta theae. Pink disease Corticium salmonicolor. Poria root rot and stem canker Poria hypobrunnea. Purple root rot Helicobasidium compactum. Red leaf spot Phoma theicola. Red root rot Ganoderma philippii Poria hypolateritia [1] = Ceriporiopsis hypolateritia [1] Red rust (alga) [2] Cephaleuros ...
Dryberry disease (loganberry) Monilinia rubi (plus dryberry mite, see under miscellaneous disorders) Fruit rots, minor Alternaria spp. Cladosporium spp. Colletotrichum gloeosporioides Colletotrichum acutatum Penicillium spp. Gnomonia cane canker Gnomonia rubi: Late leaf rust Pucciniastrum americanum Pucciniastrum arcticum. Leaf spots
Fungal diseases; Anthracnose Colletotrichum coccodes = Colletotrichum atramentarium = Colletotrichum dematium: Black dot disease Epicoccum nigrum = Epicoccum purpurascens: Black mildew Schiffnerula cannabis: Brown blight Alternaria alternata = Alternaria tenuis: Brown leaf spot and stem canker Ascochyta spp. Ascochyta prasadii Phoma spp ...