Races of bacterial spot pathogen infecting genus Capsicum in Bulgaria

K. Vasileva1, N. Bogatzevska2

1Maritsa Vegetable Crops Research Institute, 32 Brezovsko Shosse Str., 4003 Plovdiv, Bulgaria
2Institute of Soil Science, Agrotechnologies and Plant Protection “N. Pushkarov”, 7 Shosse Bankya Str., 1331 Sofia, Bulgaria.

(Manuscript received 27 February 2018; accepted for publication 21 April 2019)

Abstract. The causative agents of bacterial spot disease infecting pepper are the species X. euvesicatoria and X. vesicatoria common in the typical pepper growing areas (Northern: Black Sea Costal and Central; Southwest; Southern – Upper Thracian valley) in Bulgaria. The pathogens refer to pepper P pathotype (22 strains) and pepper-tomato РТ pathotype (52 strains). The natural population of X. еuvesicatoria is heterogeneous of pathotype and physiological races. Widespread is race P6 in the P of the pathogen, followed by race P1. Single strains are assigned to P3, P9 and P10. In PT, races P0, P1, P4, P5 are differentiated, the dominant race in PT is the P4 race in combination with the tomato race T2. For the first time in Bulgaria in the natural population of X. vesicatoria, are detected strains which infect only pepper, differentiated are races Р0, Р2 and Р3. The population of X. vesicatoria PT prevails in private gardens and vegetable areas near tomatoes. Differentiated races are P1, P3 and P4 in combination with tomato races T1, T2 and T3. Race P3 occurs in P and PT pathotype.