The natural range of the chestnut bark disease at the present time--that is, I mean, its range on the native chestnut and the range through which it is now spreading by non-human agencies, is, on the north, practically co-extensive with the range of the native chestnut. The disease is found in Maine, New Hampshire, Vermont, as far south as Virginia, and as far west as western Pennsylvania and eastern West Virginia. Throughout this area it is spreading by what I may call natural means, and the disease has been shown to be unusually well provided with means of dissemination. I will speak a little later about the spread of the disease outside of this area--that is, west and south, since in the West and in the South it is being spread, as far as we know, exclusively by human agencies.
The question is often asked me, "What is the future of the chestnut--that is, the native chestnut--in this country? What is the course of the disease going to be?" The only way in which we can answer that is to look in the parts of the country where the disease has been present longest--Long Island, for example; Westchester county, New York; Bergen county, New Jersey; Fairfield county, Conn. Upon a recent examination of those areas I found no chestnut trees surviving in a healthy condition. We have, of course, from the beginning, hunted, and hunted hard, to find individual chestnut trees that might be immune to the disease--native American chestnuts. We expected to find such trees, but up to date we have not found them. It is a very extraordinary fact and an almost unparalleled fact, because with the majority of plants affected, by any given disease, we can find some individuals that are not only resistant, but immune.
Now, in these old areas, particularly on Long Island, in 1907, when the disease first came under my observation, I marked certain trees in order to observe how long the stumps of these trees or the dead trees would continue to send up sprouts from the ground. It is an interesting fact that some of those trees which were dead in 1907 are still putting up sprouts. The sprouting capacity of the chestnut tree is indeed marvelous, but I am sorry to say that I haven't been able to find any healthy sprouts over three years old. I haven't been able to find any living sprouts more than four years old. The disease seems to be following up the sprouts as it followed up the original stem.