RESUMEN Pyricularia spp. es un complejo fúngico causante de la enfermedad conocida como tizón en más de 50 especies de la familia Poaceae. El más conocido es Pyricularia oryzae Cavara, patógeno en cultivos principales como arroz, trigo, mijo, cebada y malezas. Con el objetivo de actualizar el rango de hospedantes, diferenciar la sintomatología, aislar las cepas de la región y caracterizarlas a través del estudio morfométrico y cultural, se realizó durante la campaña 2016/17, el relevamiento de plantas con síntomas de tizón en campos de la provincia de Corrientes. El agente causal fue identificado por caracterización morfométrica y cultural como Pyricularia spp.
Pyricularia spp is a fungal complex whose best known representative is Pyricularia oryzae. It also affects other weeds that grow alongside the rice culture, posing greater risk of contribute as primary inoculum for development, survival and dissemination of pathogen. During monitoring of species weeds near of rice culture in Corrientes (Argentina), were observed symptoms of blast on leaf blades of Oplismenopsis najada, known as “canutillo” (Poaceae). It is a perennial species that inhabits flooded and rice-growing areas of argentinian NE. Koch's postulates were applied to determine the etiology confirming O. najada as a new host of Pyricularia spp, but incapable of causing disease in rice. This is the first report of Oplismenopsis najada as new host of Pyricularia spp in Argentina.
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