Native American elms and evolution against diseases
Many native elms are sick and dying. But they are resistant enough to produce seeds for many years. New plants grow out of the seeds with the illness and are able to produce seeds again.
If you do not cut down the native elms, but let them stand in illness, then after millions and millions of years, the native elms will be resistant to this disease. Those more resistant will survive better, over time.
The changes are here and there over an extremely long clock.
However, this natural course may not be cooperative with the interests of humans.
What do you think?