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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 Leaf Blight (Botrytis squamosa) is a fungal disease which mainly affects plants in the allium family, particularly onions. [14] [15] The impacts of Botrytis Leaf Blight are mainly seen in the leaves of the plant.
Other species of Botrytis may be present, such as B. peoniae on peonies, B. squamosa on onion, and B. tulipae on tulips. These species of Botrytis share some common characteristics in pathology and ecology. The generic name Botrytis is derived from the Greek bótrys ("cluster of", "grapes") and the Latin suffix -itis ("like"). [5]
Leaf blight occurs in areas with hot and humid weather. The spores land on onion leaves, penetrate the skin, and rapidly kill the leaf. This causes a severe reduction in bulb size, as high as 50%, and can happen in less than a week. [120] Applications of foliar fungicides can be used to control leaf blight.
The anamorphs of Botryotinia are mostly included in the "imperfect fungi" genus Botrytis. The genus contains 22 species and one hybrid. The genus contains 22 species and one hybrid. Plant diseases caused by Botryotinia species appear primarily as blossom blights and fruit rots but also as leaf spots and bulb rots in the field and in stored ...
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.
Gray leaf spot Stemphylium solani Stemphylium lycopersici. Gray mold Botrytis cinerea. Phytophthora blight Phytophthora capsici. Powdery mildew Oidiopsis sicula Oidiopsis taurica [synanamorph] Leveillula taurica [teleomorph] Southern blight Sclerotium rolfsii Athelia rolfsii [teleomorph] Verticillium wilt Verticillium albo-atrum Verticillium ...
Botryodiplodia blight Lasiodiplodia theobromae = Botryodiplodia theobromae. Botryosphaeria stem canker Botryosphaeria xanthocephala Fusicoccum cajani [anamorph] Botrytis gray mold Botrytis cinerea. Cercoseptoria leaf spot Cercoseptoria cajanicola. Cercospora leaf spot Mycovellosiella cajani = Cercospora cajani Cercospora indica Cercospora ...