Thanks for the replies. I did not know that Am. elm could make it to reproductive age before the blight strikes. To my knowledge they have pretty much disappeared from the landscape here in the Midwest. Sounds like a similar pattern to chestnut blight, though I think chestnut endures because it continues to grow up from the stumps. We, too, are losing oaks though I don't think it has reached epidemic proportions yet. A bigger worry is the emerald ash borer. When we camp we no longer bring our own firewood and pay the outrageous prices at the campgrounds hoping to help stem the spread.
Best,
Tom