<i>Phytophthora</i> : Timeline of taxonomy and identification from plant pathology’s origin to molecular technologies

<i>Phytophthora</i>, with 261 valid species, is one of the most important and well-studied genera of plant pathogens. Globally, numerous species cause damaging diseases with ecological, economic, and regulatory importance. The significant impact of the genus on human history is emphasized by the devastating Irish Potato Famine in 1845-1852. In Ireland, about 1.5 million people died and about 1.5 million more emigrated due to starvation caused by a then-undescribed disease of potatoes. Berkeley (1846), supporter of the fungal theory, and De Bary (1876), who described <i>Phytophthora</i> <i>infestans</i> (<i>Phytophthora</i> means "plant destroyer"), are pioneers who helped to originate the discipline of plant pathology. In this manuscript, we recap the Irish famine, the origin of plant pathology, and the fascinating history of the taxonomy and identification of <i>Phytophthora</i>. We include the morphological era (1876 - 1999) and the molecular era (2000 to present) with information on described species, phylogenies, identification resources, and aspects of state-of-the-art molecular technologies. We also update information presented in the Revision of <i>Phytophthora</i> (Abad et al. 2023a) that included databases of sequences of the ex-types for Sanger sequencing, second and third generation high throughput sequencing, and whole genome sequencing. The 180-year timeline of <i>Phytophthora</i> history demonstrates that it is a unique genus with significant contributions in plant pathology.