Figure 1.

Global map of early outbreaks of late blight caused by Phytophthora infestans. Years within each country indicate the date of the earliest known specimen, while color indicates if the genotype was FAM-1, US-1 or unsampled. Dotted lines indicate representative trade routes of the British Empire circa 1932. Arrows indicate the most likely migration path taken by the FAM-1 lineage into Africa and Asia based on DIYABC analysis and trade routes. Stars within each country indicate the approximate location of the first recorded outbreak, if known. The map was generated using ArcMap 10.8 (http://desktop.arcgis.com).