Sakr, N. Pl2 Resistance Gene Differentiates the Pathogenicity in Four "Plasmopara Halstedii" (sunflower Downy Mildew) Races 304, 704, 314 and 714. Bot. complut. 2015, 39, 19-29. https://doi.org/10.5209/rev_BOCM.2015.v39.49130.