P-5: Spectrum of resistance to Verticillium longisporum in Polish winter oilseed rape breeding materials

Abstract: Since the use of fungicides is now restricted as, as a result of environmental concerns, the growth of resistant cultivars is an efficient method to control diseases. Resistant winter oilseed rape (WOSR) cultivars that impede the development of Verticillium longisporum, a soilborne pathogen, can be used to control verticilliose. In our study, 90 breeding lines (from 3 breeding companies) were screened for resistance under controlled greenhouse conditions for two consecutive years. Disease severity in Polish WOSR breeding materials varied from 0.1 to 7.1 (2021) and from 0.77 to 3.29 (2022). This variation is extensive and should help in developing resistant cultivars in the future.