Scientists have used plant samples collected in the mid-19th Century to identify the pathogen that caused the Irish potato famine.
A plant pest that causes potato blight spread to Ireland in 1845 triggering a famine that killed one million people.
[It is interesting to learn  from this article that,  “Phytophthora infestans – which causes potato blight – emerged in the US in 1844, and spread to Europe the following year.”]

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