| population structure of peronospora effusa in the southwestern united states. | peronospora effusa is an obligate pathogen that causes downy mildew on spinach and is considered the most economically important disease of spinach. the objective of the current research was to assess genetic diversity of known historical races and isolates collected in 2014 from production fields in yuma, arizona and salinas valley, california. candidate neutral single nucleotide polymorphisms (snps) were identified by comparing sequence data from reference isolates of known races of the pathog ... | 2016 | 26828428 |