Evaluation of the Existence of a New Race of Bremia lactucae on Lettuce

Lettuce is one of the most consumed leafy vegetables in Turkey. The production lettuce has been to get difficult due infestation cultivation areas with Bremia lactucae. This pathogen genetically very variable. Pathogenic variation B. lactucae not studied yet objective this study was monitore races two geographic regions During growing season May and October 2018, totally 72 diseased leaf samples containing sporangia were collected from fields Bartın Ankara provinces. From these 6 isolates obtained. After a multiplication procedure, which susceptible cultivar 'Green Towers' used, inoculated differentiating cultivars. response seedlings evaluated on 7, 11 14 days after inoculation. qualitative method used for assessment infected seedlings. Sextet codes found as 44-00-01 13-03-04 respectively. sextet Turkish did match any present 37 result suggests that our may be new or pathotypes.