Botrytis squamosa
species of fungus
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. The pathogen is an ascomycete that belongs to the family Sclerotiniaceae in the order Helotiales. The lesions start out as whitish streaks and take on a yellow tinge as they mature. They cause yield losses up to 30%. This fungus is endemic to the USA and has also been reported in Europe, Asia, and Australia. Typical management of this disease includes chemical fungicides with significant efforts being made to establish a means of biological control.
Host and symptoms
This pathogen only affects onion, garlic and leek – Allium spp.
The first symptom of the disease occurs in the leaves 24–48 hours after initial exposure to the pathogen, appearing as long white lesions 1–5 mm in length surrounded by a greenish-white halo. The tissue then turns soft due to pectolytic enzymes produced by the pathogen and the center of the lesion takes on a straw-color. Complete blighting can be seen about 12 days after initial infection.
This brief starts where responsible research should: with the source description of “Botrytis squamosa” as species of fungus. Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the science & nature register because the source frames it as species of fungus. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Aug 19, 2025. The linked authority identifier is Q2132442. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Botrytis squamosa” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.