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Brazilian mycobiota of the aquatic weed Sagittaria montevidensis

     ¹ Fitopatologia, Embrapa Algodao, Rua Osvaldo Cruz, 1143, Campina Grande, Paraiba, 58428-095, Brazil
² Universidade Federal de Viçosa, Viçosa, MG, 36571-000, Brazil
³ Martin Luther University, Institut fur Geobtanik und Botanischer Garten, Neuwerk 21, D-06099 Halle, Germany, Halle, Saale

Nine species of fungi on the aquatic weed Sagittaria montevidensis (arrowhead) in south and southeastern Brazil were collected, identified, described and illustrated in a survey for possible biological control agents against this weed. Seven of them are anamorphic fungi, Alternaria alternata, Botrytis cinerea, Cercospora apii, Cercospora sagittariae, Colletotrichum gloeosporioides, Plectosporium alismatis and Pseudocercospora arthrospora and two smut fungi, Doassansiopsis deformans and Narasimhania alismatis. All of them represent new host records or new geographic localities for occurrences of the fungi. Pseudocercopora arthrospora is new to science. It differs from known species of the genus Pseudocercospora mainly by its subhyaline and disarticulating conidia and host. This fungus is close to Thedgonia but can be distinguished from fungi in this genus by its conidiogenesis. Based in the literature description and disease symptoms Cylindrocarpon sagittariae, recorded on S. trifolia from Japan, is regarded here as a later synonym of Plectosporium alismatis. Preliminary observations of the fungi in the field and in culture suggest that four of these have potential for use as biocontrol agents against S. montevidensis, namely: C. sagittariae, C. gloeosporioides, P. alismatis and P. arthrospora.

Key words: Alismataceae, anamorphic fungi, aquatic weeds, giant arrowhead, fungal survey, smut fungi