Control de la roya marrón de la caña de azúcar y su impacto en componentes del rendimiento de los cultivares LCP 85-384 y TUCCP 77-42 en Tucumán, Argentina

FUNES, C.; HENRIQUEZ, D.D.; BERTANI, R.P.; JOYA, C.M.; DIAZ, E.F.; GONZALEZ, V.; ROMERO, E.; PLOPER, L. D.

Tucumán

Congreso; XIX Reunión Técnica Nacional de la Caña de Azúcar; 2014

Sociedad Argentina de Técnicos de la Caña de Azúcar

Brown rust, caused by Puccinia melanocephala, can cause severe epidemics in susceptible sugarcane cultivars during mid to late summer in Tucumán, Argentina. The effects of fungicide on brown rust severity and sugarcane yield of the main sugarcane cultivars in the province, LCP 85-384 and TUCCP 77-42, was evaluated in field experiments conducted during the 2012-2013 growing season. Treatments included an untreated control and up to four applications of fungicide (pyraclostrobin y epoxiconazole) every two weeks during the epidemic period. Results showed that several treatments were able to reduce the progress of the disease on both cultivars. However, despite the significant brown rust severity differences between the untreated control and most of the chemical treatments, there were no significant effects on yield in both cultivars. The most efficient strategy to manage brown rust is the use of resistant varieties, but the application of fungicides should be considered as an alternative in case of severe epidemics, especially if resistance is overcome by new pathotypes of P. melanocephala.