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Pyrenophora tritici-repentis

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Pyrenophora tritici-repentis (telomorph) and Drechslera tritici-repentis (anamorph) is a necrotrophic plant pathogen of fungal origin, phylum Ascomycota. The pathogen causes a disease originally named yellow spot but now commonly called tan spot, yellow leaf spot, yellow leaf blotch or helminthosporiosis. At least eight races of the pathogen are known to occur based on their virulence on a wheat differential set.The tan (yellow) spot fungus was first described by Nisikado in 1923 in Japan. and was later identified in Europe, Australia and the USA, in the mid 1900s. The disease is one of the most important fungal disease on wheat and the fungal pathogen is found to infect in all parts of the world wherever wheat and other susceptible host crops are found. P. tritici-repentis overwinters on…

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