mancha foliar em capim-elefante no cerrado do brasil central causada por bipolaris maydi leaf spot in elephantgrass in the cerrado region of central brazil caused by bipolaris maydis

Abstract

Bipolaris maydis (Y. Nisik. & C. Miyake) Shoemaker foi consistentemente isolado de plantas de Pennisetum purpureum Schum., com sintomas de manchas foliares, no Cerrado, em 2005 e 2006. Testes de patogenicidade em mudas sadias de capim-elefante, em casa de vegetação, e o subseqüente reisolamento do fungo confirmaram que B. maydis era o agente causal das lesões foliares observadas. Os primeiros sintomas apareceram dois dias após a inoculação. Onze outras espécies de gramíneas foram suscetíveis ao fungo.
Bipolaris maydis (Y. Nisik. & C. Miyake) Shoemaker was consistently isolated from elephantgrass (Pennisetum purpureum Schum.) showing leaf spot symptoms in the Cerrado of Central Brazil in 2005 and 2006. Pathogenicity tests, under greenhouse conditions, and subsequent re-isolation of B. maydis from artificially infected elephant grass seedlings confirmed that this fungus was the causal agent of the disease. First symptoms of leaf spot appeared two days after inoculation. Eleven other grass species proved to be susceptible to the fungus.