NOTAS FITOPATOLÓGICAS / PHYTOPATHOLOGAL NOTES
Cercospora talini on Talinum patens in Brazil
Cercospora talini em Talinum patens no Brasil
Olinto L. PereiraI; Robert W. BarretoI; José L. BezerraII
IDepartamento de Fitopatologia, Universidade Federal de Viçosa, CEP 36571-000, Viçosa-MG
IIComissão Executiva da Lavoura Cacaueira, Centro de Pesquisa CEPEC/CEPLAC, Cx. Postal 07,CEP 45600-000, Itabuna-BA; e-mail: liparini@bol.com.br
RESUMO
O fungo Cercospora talini é relatado afetando Talinum patens pela primeira vez no Brasil, Itabuna, BA.
Talinum patens (Jacq.) Willd (local names: "língua de vaca", "benção-de-deus" and "maria-gomes") is a herbaceous plant, native to the Americas, belonging to the Portulacaceae family. It is popularly used as a vegetable in north and northeastearn Brazil and is known to have some medicinal properties (Daniel et al., Plantas Medicinais, Editora UFV, 2000). It is also regarded as an invasive weed in some situations (Kissmann & Groth, Plantas Infestantes e Nocivas, 1ª ed.,BASF S.A., 1995). Leaf spots were observed on T. patens growing close to a cocoa (Theobroma cacao L.) nursery in Itabuna, Bahia, in March 2002. Lesions on living leaves were circular, 1-5 mm in diameter, reddish brown with a dark olivaceous border (Figure 1A). Cercospora talini Syd. & P. Syd. (Figure 1B and C) was regularly associated with such lesions. The only record of this fungus is from Argentina and Venezuela (Chupp, A monograph of the fungal genus Cercospora, 1954). Morphological features for this fungus were: internal mycelium inconspicuous, external mycelium absent; stomata poorly developed, dark brown, minute; conidiophores pale brown, unbranched, cylindrical, two-ten per fascicle, one-five transverse septate, 40.0-80.0 x 4.0-5.0 mm, arising from stomatal openings. Conidiogenous cells terminal or intercalary, integrated, proliferating sympodially; conidiogenous loci thickened and darkened, one-two per cell, holoblastic; conidia filiform to obclavate, dry, solitary, straight to slightly curved, 50.0-120 x 2.0-3.5 mm, hyaline, seven-ten septate, base truncate with a thick and darkened scar (VIC 22220). This is the first record of C. talini in Brazil.
Acknowledgments. We wish to thank Mr. José Lima da Paixão, CEPLAC Herbarium, for the plant identification.
Accepted for publication on 29/01/2003
Corresponding author: Olinto L. Pereira
Datas de Publicação
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Publicação nesta coleção
12 Jun 2003 -
Data do Fascículo
Abr 2003
