Distribution of major clonal lineages EU_13_A2, EU_2_A1, and EU_23_A1 of <i>Phytophthora infestans</i> associated with potato late blight across crop seasons and regions in Algeria

Potato is one of the most important agricultural crops in Algeria and worldwide. Each year, potato late blight, caused by Phytophthora infestans, responsible for significant damage that leads to large production losses, thus a direct threat food security Algeria. In this study, 131 isolates P. infestans 92 DNA fingerprints captured on FTA cards were sampled from commercial seed fields three major regions (western, eastern, central) during main-season late-season over six cropping seasons (2010–2016). Genotypes population genetic diversity analysed using 17-plex simple-sequence repeat (SSR) marker assay, mating type all was characterized. Both types (A1 A2) found, often occurred same field. Differences proportion observed between sampling periods. Analysis with SSR markers showed prevalence EU_13_A2 lineage (70%) EU_2_A1 (16%), EU_23_A1 (10%), 4% unknown multilocus (MLL). The differentiation within group. found mainly crops. However, region did not influence distribution lineages due dispersal pathogen seeds. Genetic structure reveal clear variation throughout regions. These data provide new information composition change time populations open way better understanding local epidemiology pathogen.