Oplismenopsis najada new host of Pyricularia spp.

Abstract 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.