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<p>The risk of the introduction of pathogens into the USA with trade requires continued surveillance and improved diagnostic capabilities at our borders. <i>Phytophthora infestans</i>, 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 in the USA since 2011 to report disease presence and to alert stakeholders of the presence of blight. USABlight has now been 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 the spread of modern and historic lineages (US-1, FAM-1) of the pathogen. A complete T-BAS phylogeny of <i>Phytophthora</i> has been released as a community tool for identification of new emergent <i>Phytophthora</i> species and for phylogenetic tracking of specific SSR lineages of <i>P. infestans</i>. We have also developed LAMP assays that can be deployed on smart phones for rapid in-field detection of specific lineages of <i>Phytophthora infestans.</i> Targeted amplicon sequencing is underway to monitor the emergence of specific lineages and changes in fungicide resistance and virulence phenotypes of the pathogen. All these tools will help us respond to and mitigate outbreaks, improve the deployment of host resistance, and inform policy.</p>

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Predicting Future Phytophthora Outbreaks: New Tools to Identify Emerging Lineages and Track Spread

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Jean Beagle Ristaino

摘要

The risk of the introduction of pathogens into the USA 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 in the USA since 2011 to report disease presence and to alert stakeholders of the presence of blight. USABlight has now been 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 the spread of modern and historic lineages (US-1, FAM-1) of the pathogen. A complete T-BAS phylogeny of Phytophthora has been released as a community tool for identification of new emergent Phytophthora species and for phylogenetic tracking of specific SSR lineages of P. infestans. We have also developed LAMP assays that can be deployed on smart phones for rapid in-field detection of specific lineages of Phytophthora infestans. Targeted amplicon sequencing is underway to monitor the emergence of specific lineages and changes in fungicide resistance and virulence phenotypes of the pathogen. All these tools will help us respond to and mitigate outbreaks, improve the deployment of host resistance, and inform policy.