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Nick
I don't have direct experience of this particular issue but you could
start at Forest Research
https://www.forestresearch.gov.uk/research/conservation-of-black-poplar-insights-from-a-dna-fingerprinting-approach/
You may want to read their 2018 paper first to understand the genetic
issues involved.
What work they are doing during COVID, I do not know!
Jon
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