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Title: Resistance of sweet orange Pera (Citrus sinensis) genotypes to Xanthomonas citri subsp. citri under field conditions

Author
item GONCALVES-ZULIANI, ALINE - University Of Maringa
item NANAMI, D.S. - University Of Maringa
item NOCCHI, AULA - University Of Maringa
item FRIAS, A.A. - University Of Maringa
item FRANCO, J.G. - University Of Maringa
item ZANUTTO, CARLOS - University Of Maringa
item Bock, Clive
item NUNES, WILLIAM - University Of Maringa

Submitted to: American Phytopathology Society
Publication Type: Abstract Only
Publication Acceptance Date: 5/8/2015
Publication Date: 11/1/2015
Citation: Goncalves-Zuliani, A.M., Nanami, D., Nocchi, A.T., Frias, A., Franco, J., Zanutto, C.A., Bock, C.H., Nunes, W.M. 2015. Resistance of sweet orange Pera (Citrus sinensis) genotypes to Xanthomonas citri subsp. citri under field conditions. American Phytopathology Society. 105(Suppl. 4):S4.51.

Interpretive Summary: Abstract only. JLR

Technical Abstract: Citrus canker control is based on protection measures and eradication of plants infected with Xanthomonas citri subsp. citri. Although these measures show satisfactory results, the use of resistant genotypes is an important alternative for citrus canker control. The aim of this study was to evaluate resistance to citrus canker of genotypes of Pera sweet orange under field conditions at three commercial orchards in Congonhinhas, Cornélio Procópio and Paranavaí located in Paraná state, in 2010, 2011 and 2012. Canker incidence and severity was evaluated on 10 plants of each genotype.. Four branches were sampled per plant. On each branch the total leaves, diseased leaves, and lesions per leaf were counted, and the severity estimated using using a diagrammatic scale. The results from the experiment at Congonhinhas showed a larger number of resistant genotypes in relation to other locations. EEL and Ovale Siracusa genotypes had greater resistance to citrus canker on leaves with an incidence <1% and a severity of 0.00 to 0.40%on fruit. There were small variations in productivity of the genotypes, , indicating the most important factor affecting choice of Pera genotypes to plant in Paraná State may be resistance to X.c. subsp. citri.