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Identification of helminthosporium tritici repentis equals pyrenophora tritici repentis the causal agent of a wheat leaf blight in mexico



Identification of helminthosporium tritici repentis equals pyrenophora tritici repentis the causal agent of a wheat leaf blight in mexico



Agrociencia (56): 151-162



The occurrence of a severe leaf blight on wheat grown in the neighborhood of Ario de Rosales, Michoacan State, during the 1980-1981 growing season led to the search for the causal organism. From blighted leaves a Helminthosporium species was isolated which upon inoculation on healthy wheat plants reproduced the characteristic symptoms of the disease: necrotic, oval ellypsoid spots surrounded by a yellowish halo. The best method to promote abundant asexual sporulation was to grow the fungus on V-8 juice-agar under alternate light/darkness regime (10/14 hrs), and to scrape 7th day old colonies. The sexual stage was formed most abundantly by growing the fungus on sterile oats under the same light/dark regime. This stage was also noted on infected straw left outdoors. Taking into consideration the symptoms observed in the field, those induced at the greenhouse, and the morphological characteristics of the fungus, it was concluded that the causal agent of a new blight of wheat in Ario de Rosales, is Pyrenophora tritici-repentis (= H. tritici-repentis).

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Accession: 005613404

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