Septoria cannabis
fungal plant pathogen
Septoria cannabis is a species of plant pathogen from the genus Septoria that causes the disease commonly known as Septoria leaf spot. Early symptoms of infection are concentric white lesions on the vegetative leaves of cannabis plants, followed by chlorosis and necrosis of the leaf until it is ultimately overcome by disease and all living cells are then killed. Septoria, which is an ascomycete and pycnidia producing fungus, has been well known to attack Solanaceae and Cucurbitaceae species as well as many tree species. This genus is known to comprise over 1,000 species of pathogens, each infecting a specific and unique host.
Hosts and symptoms
This disease only infects cannabis or hemp plants. Symptomatic responses associated with this disease will be in the form of white lesions with concentric rings on the surface of the plants vegetative leaves, as well as browning and chlorosis on infected leaves. The first symptoms of this disease will occur on the older, lower leaves of the plant. Septoria has been known to spread rapidly within a growing season and will eventually attack all of the cannabis’ vegetative growth rendering it unable to perform any biological processes and ultimately die. If the disease is extreme most vegetative tissue will be destroyed, taking away the cannabis plant’s source of sugars and ultimately turning the entire host into a sink and reducing yields come harvest. Nitrogen deficient cannabis plants are more susceptible to being infected.
The public source identifies “Septoria cannabis” as fungal plant pathogen. This brief keeps that definition visible, then builds a research path around Septoria, cannabis and fungal.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Oct 3, 2024. The linked authority identifier is Q5231639. None of the 0 selected statements returned an explicit reference.
Scientific names, classifications and consensus can change while older terminology persists in catalogues and historical literature. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Septoria cannabis” 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.