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Alternaria leaf spot or Alternaria leaf blight are a group of fungal diseases in plants, that have a variety of hosts. [ 1 ] [ 2 ] [ 3 ] The diseases infects common garden plants, such as cabbage, and are caused by several closely related species of fungi. [ 4 ]
Alternaria alternata – Causes early blight of potato, leaf spot disease in Withania somnifera [9] Alternaria allii - causes onion leaf blight; Alternaria arborescens – causes stem canker of tomato; Alternaria arbusti – causes leaf lesions on Asian pear; Alternaria blumeae – causes lesions on Blumea aurita
Alternaria alternata is a fungus causing leaf spots, rots, and blights on many plant parts, and other diseases. It is an opportunistic [ citation needed ] pathogen on over 380 host species of plant. It can also cause upper respiratory tract infections [ 1 ] and asthma in humans with compromised immunity.
Alternaria solani is a fungal pathogen that produces a disease in tomato and potato plants called early blight. The pathogen produces distinctive "bullseye" patterned leaf spots and can also cause stem lesions and fruit rot on tomato and tuber blight on potato. Despite the name "early", foliar symptoms usually occur on older leaves. [3]
Symptoms of Alternaria leaf spot appear as lesions with tan spots on the leaves. The centers of these lesions become black with fungal sporulation. This infection can lead to tree death within 3–4 years of the first serious outbreak.
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.
Fungal diseases; Alternaria leaf spot Alternaria alternata Alternaria brassicae. Anthracnose Colletotrichum dematium: Aphanomyces root rot (black root) Aphanomyces cochlioides: Black wood vessel Pythium irregulare: Cercospora leaf spot Cercospora beticola: Charcoal rot Macrophomina phaseolina: Choanephora rot Choanephora cucurbitarum
Alternaria padwickii is a plant pathogen that attacks rice. It is associated with the disease stackburn, otherwise known as alternaria leaf spot . Rice grown in northeast Argentina commonly suffers from A. padwickii [ 1 ] and the particular strains found there are highly resistant to carboxin and moderately resistant to a few other fungicides [ 1 ]