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Botrytis squamosa (teleomorph: Botryotinia squamosa) is a fungus that causes leaf blight on onion (often termed ‘blast’) that is distinctly characterized by the two stages – leaf spotting followed by blighting. [1] The pathogen is an ascomycete that belongs to the family Sclerotiniaceae in the order Helotiales. [2]
Botrytis is a genus of anamorphic fungi in the family Sclerotiniaceae. Botrytis (also known as grey mold) belongs to the group hyphomycetes and has about 30 different species. It is a plant parasite as well as saprophytes on both agricultural and forest trees.
Fungal diseases; Botrytis blight Botrytis cinerea. Myrothecium root and crown rot Myrothecium roridum. Phytophthora root and stem rot Phytophthora spp. Pythium root rot Pythium ultimum Pythium mastophorum. Sclerotinia blight Sclerotinia sclerotiorum. Verticillium wilt Verticillium albo-atrum
There are seven different species of Botrytis associated with onions in storage, but the rot induced by B. allii and B. aclada causes the greatest commercial loss. The two can be distinguished microscopically; the conidia of B. allii have a maximum length of 15 μm and mean size of 10.2 × 5.7 μm, while the conidia of B. aclada have a maximum length of 12 μm and mean size of 8.6 × 4.6 μm.
The Botrytis Leaf Blight pathogen survives the winter much like White Rot does, as sclerotia (a small mass of fungi capable of thriving in hostile conditions). [15] Such sclerotia is responsible for spreading the pathogen and infecting crops as it has been observed to infect leaves and bulbs of sprouted crops.
Rhizoctonia solani root rot on corn roots, magnified 0.63X. Damping off can be prevented or controlled in several different ways. Sowing seeds in a sterilized growing medium can be effective, although fungal spores may still be introduced to the medium, either on the seeds themselves or after sowing (in water or on the wind).
Pale brown root rot Pseudophaeolus baudonii. Phloem necrosis Phloem necrosis virus (Camellia Virus 1) 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 ...
Leaf blight of the grasses e.g. Ascochyta species [5] and Alternaria triticina that causes blight in wheat [6] Bur oak blight , caused by the fungal pathogen Tubakia iowensis . South American leaf blight, caused by the ascomycete Pseudocercospora ulei , [ 7 ] [ 8 ] [ 9 ] also called Microcyclus ulei , [ 10 ] ended the cultivation of the rubber ...