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likely culprit for never a Rock Elm seed anymore is Dutch Elm Disease
Sorry I misspelled Herbarium in the previous post and
sorry that this post is disjoint from the thread, because Google posting is "down". It used to be that we could make followup replies with Google newsgroups but they are "down". Anyway, coming to think about why no Ulmus Thomasii seeds in the past decade is probably due to Dutch Elm Disease or ascomycete microfungi. Probably that the fungus affects the seed production of Ulmus Thomasii the worst. So that all Rock Elm will never bear seeds if there is the fungus present. Now that is just my speculation and not any research. I have tried gathering seeds from nearby Rock Elm and have never found any for the past 5 years. I had thought I had Rock Elm some years past but those trees are now showing up as American Elm. So some American elm seed had blown onto the site where a Rock Elm was located. I am calling an alarm because, if my speculation is true, then we need to go into action in order to not have Rock Elm go extinct. If we cannot get any seeds, the species will go extinct. So the only way to save them is via grafting or via cuttings and until some future time when we can get the fungus under control. Archimedes Plutonium www.iw.net/~a_plutonium whole entire Universe is just one big atom where dots of the electron-dot-cloud are galaxies |
#2
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likely culprit for never a Rock Elm seed anymore is Dutch Elm Disease
Archimedes Plutonium wrote in
: Sorry I misspelled Herbarium in the previous post and sorry that this post is disjoint from the thread, because Google posting is "down". It used to be that we could make followup replies with Google newsgroups but they are "down". Anyway, coming to think about why no Ulmus Thomasii seeds in the past decade is probably due to Dutch Elm Disease or ascomycete microfungi. Probably that the fungus affects the seed production of Ulmus Thomasii the worst. So that all Rock Elm will never bear seeds if there is the fungus present. Now that is just my speculation and not any research. I have tried gathering seeds from nearby Rock Elm and have never found any for the past 5 years. I had thought I had Rock Elm some years past but those trees are now showing up as American Elm. So some American elm seed had blown onto the site where a Rock Elm was located. I am calling an alarm because, if my speculation is true, then we need to go into action in order to not have Rock Elm go extinct. If we cannot get any seeds, the species will go extinct. So the only way to save them is via grafting or via cuttings and until some future time when we can get the fungus under control. Rock Elm isn't common in South Dakota, as I understand is the location you are growing them. The trees need to be about 20 years old to flower, and like other spring flowering elms, if the winter is too cold, or if there is a cold snap at the wrong time, you may not get seeds. Sean -- Check out my flickr page, it changes often. http://www.flickr.com/photos/groms |
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