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Fernandes, R.C. & R.W. Barreto. Ramularia pistiae sp. nov. - a new leaf spot fungus on water lettuce (Pistia stratiotes) from Nicaragua. Mycotaxon 92: 49-53. 2005.

ABSTRACT: A new species of Ramularia, associated with leaf spots on the pantropical aquatic weed Pistia stratiotes (water lettuce) inhabiting roadside ponds in Nicaragua, is described. The fungus is compared with Ramularia aromatica, the sole other species in this genus known to attack a member of the Araceae. P. stratiotes is one of the world's worst aquatic weeds and has been the target of several biological control programs. The new fungus is named Ramularia pistiae and represents the second fungal pathogen to be reported on this host in the Neotropics, which is considered to be the center of origin of this weed. A thorough search in different parts of Brazil for fungi to be used as biological control agents only yielded a single fungus I which is already known to occur in the Old World. This record indicates that in the future, surveys for natural enemies of P. stratiotes should include Central America.

KEYWORDS: hyphomycetes, Moniliaceae, cercosporoid, classical biocontrol

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