Virulence of Phytophthora infestans isolates from potato in Spain

The oomycete Phytophthora infestans is responsible for the disease known as late blight in potato and tomato. It plant pathogen that has caused greatest impact on humankind so far and, despite all studies have been made, it remains most important this crop. In Spain during last years a greater severity of observed both, tomato, probably due to genetic changes populations described recently. aim study was characterization physiological strains 52 isolates P. obtained different potato-growing areas Spain. For purpose, inoculations detached leaves were performed order determine compatibility or incompatibility reactions. A total 17 races found. less frequent virulence factors Avr5 Avr8. By studying epidemiology pathogen, specific breeding program resistance can be implemented.