The risk of introduction of pathogens into the US with trade requires continued surveillance and improved diagnostic capabilities at our borders. Phytophthora infestans, the causal agent of potato late blight was responsible for the Irish potato famine and is still a threat to food security globally. A disease surveillance and mapping system called USAblight.org has been operative since 2011 to report disease and alert stakeholders. USABlight and has now transitioned into the Plant Aid Database (PaDB). An SSR genotyping querying system has been developed to identify emerging lineages and sequence based approaches have been used to track spread of the pathogen. Targeted amplicon sequencing can be used to monitor emergence of specific lineages and changes in pathogen phenotypes. We have also developed LAMP assays that can be deployed on smart phones for rapid in field detection of specific lineages of Phytophthora infestans. A T BAS complete phylogeny of Phytophthora has been released as a community tool for identification of new emergent species and for phylogenetic tracking of specific SSR lineages of P. infestans. All these tools will help us respond to and mitigate outbreaks, improve deployment of host resistance and inform policy.