Pyrenophora teres
species of fungus
Pyrenophora teres is a necrotrophic fungal pathogen of some plant species, the most significant of which are economically important agricultural crops such as barley. Toxins include aspergillomarasmine A and related compounds.
Host & symptoms
Pyrenophora teres is a plant pathogen that causes net blotch on barley (Hordeum vulgare). It is a disease that is distributed worldwide, and can be found in all regions where barley is grown. Two economically significant forms of the pathogen exist, P. teres f. teres and P. teres f. maculata, which give rise to net form of net blotch and spot form of net blotch, respectively. The distinction comes not from morphology, which is essentially the same in each, but rather by the differing manifestation of symptoms upon the infection of a host. Both forms induce chlorosis and necrosis, but the presentation of these symptoms, especially the shape and spread of necrotic lesions, is how they are distinguished.
The symptoms of both forms of P. teres are similar in that they begin with pin-sized brown necrotic spots on the lamia and sheath of the leaves (the most common infection court), and sometimes on the flowers and grains.
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This entry incorporates text from “Pyrenophora teres” 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.