Plasmopara halstedii, the causal agent of downy mildew of sunflower, is an oomycete listed as a quarantine pathogen. This obligate parasite resides in a quiescent state in seeds of sunflower and can be spread from seed production areas to areas of crop production by international seed trade. To prevent the spread or the . . . → Read More: An Optimized Duplex Real-Time PCR Tool for Sensitive Detection of the Quarantine Oomycete Plasmopara halstedii in Sunflower Seeds