Red raspberry rust in the state of Santa Catarina/Ferrugem em framboesa no estado de Santa Catarina

• Published in: Revista Brasileira de fruticultura Vol. 32; no. 3; p. 916
• Main Authors: Casa, Ricardo Trezzi, Junior, Paulo Roberto Kuhnem, Bolzan, Jonatha Marcel, Bogo, Amauri, Kretzschmar, Aike Anneliese, Rufato, Leo, De Macedo, Tiago Afonso
• Format: Journal Article
• Language: Spanish
• Published: Sociedade Brasileira de Fruticultura 01.09.2010
• ISSN: 0100-2945

Leaves and fruits of red raspberry (Rubus idaeus L.) of the cultivar Batum collected from the Agroveterinary Science Center--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, small, obovate or elliptical and averaged 12,5-17,5 x 15,0-30,0 µm uredia and urediniospores become evident in leaves and fruit surface. Telia were not observed. Urediniopores (50.000 spores [mL.sup.-1]) were suspended in sterile water and sprayed onto same cultivar leaves that were maintained in a darkened mist chamber at 20 °C for 24 h and transferred to a 20 °C 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 the state of Santa Catarina, Brazil.