Resistance to bacterial blight in arabica coffee cultivars
Dhalton Shiguer Ito, Tomoru Sera, Gustavo Hiroshi Sera, Leandro Del Grossi and Fabio Seidi Kanayama
Abstract: The purpose of this study was to identify sources of resistance to Pseudomonas syringae pv. garcae in arabica coffee cultivars. The experiment was set up in March 2003. The cultivars IAPAR 59, IPR97, IPR98, IPR99, IPR100, IPR1O1, IPR102, IPR103, IPR104, IPRIOS, IPR106, IPR107 and IPR108 were evaluated under field conditions with natural disease occurrence. Catuaí Vermelho IAC-99 was used as susceptible control. Young plants were evaluated in the field in January 2004 based 6n a 1 to 5 disease severity scale, where: 1 = absence of necrotic lesions, with yellow halo; and 5 = over 45% leaves with dark necrotic lesions and dieback of vegetative shoots. The only case of complete resistance was IPR 102 (Catucat), while partial resistance is presumed in IPR 103, IPR 104, IPR 108 and IAPAR 59.