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Citrus Tristeza Virus Causes Stem Pitting in Rangpur Lime Rootstock Grafted with Some Mandarin Cultivars in Capão Bonito, Brazil

1996; Volume: 13; Issue: 13 Linguagem: Inglês

10.5070/c545f2z4r4

0074-7203

G. W. Müller, Nivaldo Guirado, José Orlando de Figueiredo, Marcos Antônio Machado, F. F. Laranjeira, Jairo Lopez de Castro,

Plant Disease Management Techniques

Trees of 11 cultivars of late maturing mandarins, tangerines and hybrids from nucellar clones were budded to Rangpur lime and Cleopatra mandarin in a field nursery where common tristeza is endemic.In 1976, these combinations were established in a planting where the Cap50 Bonito CTV complex was prevalent.By 1993, most combinations on Rangpur lime were in an advanced stage of decline and a stem pitting evaluation was carried out on the rootstock of the grafted combinations.Almost all of the Rangpur lime rootstocks showed stem pitting, with the exception of those grafted with the scions Harris, Murcott and King; whereas none of the scions or Cleopatra mandarin rootstocks showed stem pitting and had significantly higher yields.These reactions were considered to be the result of differential interaction of Cap50 Bonito CTV strains among different Mandarin or Tangerine1 Rangpur combinations that developed over the 17-yrperiod of field exposure.Furthermore, significant tolerance to the same Cap50 Bonito CTV complex was demonstrated with the same scion on Cleopatra rootstock.Several hypothesis are advanced to explain these differences.