Eine rein weibliche Wespe breitet sich rasch über die Ulmen Nordamerikas aus

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I remember in the 80s-90s when dutch elm disease swept through the Midwest. It killed literally every elm on our wooded property and all of the elms in every forest preserve near us.

It was crazy how fast and devastating it was. You could stroll through the forest and see all these trees with a spiral twist in their trunks, and those were the dead elms.

Iirc it was a beetle of some kind that spread some kind of fungus. The city had these traps all over to try and catch/study those beetles.