Centro de Ciências Agrárias

URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/11727

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Mycobiota of the weed Cyperus rotundus in the state of Rio de Janeiro, with an elucidation of its associated Puccinia complex
(Mycological Research, 1995-04) Barreto, R. W.; Evans, H. C.
A survey of the fungi associated with the pantropical weed Cyperus rotundus was conducted during 1988 and 1989 in part of its exotic range in southern Brazil. The sampling activity was concentrated in the state of Rio de Janeiro, covering 70 sites located in different climatic or ecological zones. Five species were identified as members of the pathogenic mycobiota: Cercospora caricis, Cintractia limitata, Dactylaria higginsii, Duosporium cyperi and Puccinia canaliculata. All are reported here for the first time in Brazil and Duosporium cyperi is a new record from Cyperus rotundus. The complex of six rust species belonging to Puccinia which have been described from C. rotundus was critically re-examined and three of these, Puccinia conclusa, P. cypericola and P. philippinensis are considered to be synonyms of P. canaliculata. The implications for biological control of C. rotundus are discussed.
The mycobiota of the weed Lantana camara in Brazil, with particular reference to biological control
(Mycological Research, 1995-07) Barreto, Robert W.; Evans, Harry C.; Ellison, Carol A.
A survey of the fungi associated with the tropical weed Lantana camara was conducted during 1988 and 1989 in part of its native range in southern Brazil. The sampling activity was concentrated mainly in the state of Rio de Janeiro, covering 70 sites located in different climatic or ecological zones. The survey continued and was extended to the Amazon and northeast regions. Nine fungal species were identified as members of the mycobiota, including the previously undescribed fungi: Ceratobasidium lantanae-camarae sp. nov., Dendryphiella aspera sp. nov. and Micropustulomyces mucilaginosus gen. et sp. nov. Perisporiopsis lantanae, which has not been recorded previously in Brazil, has its anamorph described for the first time. The rusts Aecidium lantanae were also recorded. Field observations suggest that several fungal pathogens have potential as classical biocontrol agents of the weed in the Old World tropics: Ceratobasidium lantanae-camarae and Puccinia lantanae in lowland humid climates; Mycovellosiella lantanae, Prospodium tuberculatum and Micropustulomyces mucilaginosus in more elevated or subtropical areas. In addition, databases and herbaria were consulted in order to compile a world list of fungal pathogens associated with L. camara.
The mycobiota of the weed Mikania micrantha in southern Brazil with particular reference to fungal pathogens for biological control
(Mycological Research, 1995-03) Barreto, Robert Weingart; Evans, Harry Charles
A survey of the fungi associated with the tropical weed Mikania micrantha was conducted during 1988 and 1989 in part of its native range in southern Brazil. Sampling was concentrated mainly in the state of Rio de Janeiro, covering 70 sites in different climatic or ecological zones. Nine species were identified, including the recently described downy mildew species Basidiophora montana and the previously undescribed Mycosphaerella mikania-micranthae sp. nov. with its anamorph Septoria mikania-micranthae. Asperisporium mikaniae comb. nov., Asperisporium mikaniigena comb. nov., Pseudocercospora plunketii comb. nov., and Cercospora mikaniacola are new records for Brazil. Field observations indicate that Basidiophora montana has potential as a classical biological control agent of the weed in Old World subtropical or montane climates, whilst Mycosphaerella mikania-micranthae and the microcyclic rust Puccinia spegazzinii appear to be equally damaging to the host but to have a wider climatic range and thus are highly promising agents for introduction throughout the Palaeotropics.