These diseases are responsible for the majority of our own current crop of various blights that affect our trees today and they originated in Europe, not here!
Send the bill back, change the name on it and tack on about three trillion Euros for general principle.
They owe the U.S. more than we can count.
No good deed goes unpunished. I hope we pause and remember that next time we're feeling inclined to help an ungrateful world.