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This however seems like overkill. The ash borer infestation in the US mostly came from central China and the insects have a very low genetic diversity. What it means is this particular population of them is adapted to the climate of central China, which closely matches the eastern US between roughly the 43rd and 33rd parallel. It's been established that Minnesota is too cold in wintertime for many larva to survive and the Deep South and Western US are too hot/dry. It's kind of like how Dutch Elm Disease didn't get established in the Deep South due to the climate.
