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Revista Brasileira de Fruticultura
Print version ISSN 0100-2945
CASA, Ricardo Trezzi et al. Red raspberry rust in Santa Catarina state. Rev. Bras. Frutic. [online]. 2010, vol.32, n.3, pp.916-920. ISSN 0100-2945. http://dx.doi.org/10.1590/S0100-29452010000300035.
Leaves and fruits of red raspberry (Rubus idaeus L.) of the cultivar Batum collected from the Agriculture and Life Science College - CAV orchard in Lages, SC, presenting rust pustules were analyzed in the CAV Plant Pathology Laboratory. Indirect diagnosis indicated in the abaxial side of the infected leaves and fruits surface pustules filled with masses of yellow spores. Under microscope exam, uredia and small, obovate or elliptical and averaged 12,5-17,5 x 15,0-30,0 µm urediniospores become evident in leaves and fruit surface. Telia were not observed. Urediniopores (50.000 esporos mL-1) were suspended in sterile water and sprayed onto same cultivar leaves that were maintained in a darkened mist chamber at 20ºC for 24 h and transferred to a 20ºC and 12 h light cycle chamber. Control leaves received sterile water only. After 10 days, sporulating uredia with urediniospores were produced on abaxial leaves and according to morphological characteristic of urediniopores, symptoms and pathogenicity, this is the first report of Pucciniastrum americanum (Farl.) Arthur in Santa Catarina State, Brazil.
Keywords : diagnosis; fungi; occurrence; Pucciniastrum americanum; Rubus idaeus.