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A leaf spot is a limited, discoloured, diseased area of a leaf that is caused by fungal, bacterial or viral plant diseases, or by injuries from nematodes, insects, environmental factors, toxicity or herbicides. These discoloured spots or lesions often have a centre of necrosis (cell death). [1] Symptoms can overlap across causal agents, however ...
Phlyctema padi (P. Karst.) Petr. (1920) [1919] Cherry leaf spot (Blumeriella jaapii) is a fungal disease which infects cherries and plums. Sweet, sour, and ornamental cherries are susceptible to the disease, being most prevalent in sour cherries. The variety of sour cherries that is the most susceptible are the English morello cherries.
Septoria malagutii is a fungal plant pathogen infecting potatoes. [ 3] The casual fungal pathogen is a deuteromycete and therefore has no true sexual stage. As a result, Septoria produces pycnidia, an asexual flask shaped fruiting body, on the leaves of potato and other tuber-bearing spp. causing small black to brown necrotic lesions ranging in ...
Gray leaf spot, known as Pyricularia grisea, is an ascomycete fungus that is known only by its anamorph form. The teleomorph phase (perfect sexual phase) has not been observed in turf but is predicted to use perithecium as the ascocarp structure to form ascospores. This form of the pathogen is known as Magnaporthe grisea.
Hosts. trees and crops. Vectors. leafhoppers. Bacterial leaf scorch (commonly abbreviated BLS, also called bacterial leaf spot) is a disease state affecting many crops, caused mainly by the xylem -plugging bacterium Xylella fastidiosa. [1] It can be mistaken for ordinary leaf scorch caused by cultural practices such as over-fertilization.
Corynespora cassiicola ring-spots symptoms on the leaves of tomato plants. Photograph by Dr. Ken Pernezny from University of Florida. Corynespora cassiicola is a species of fungus well known as a plant pathogen. It is a sac fungus in the family Corynesporascaceae. It is the type species of the genus Corynespora.
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