. Chestnut blight. Chestnut blight; Chestnut. CHESTNUT TREE BLIGHT. 13 Agriculture, is associated with iasects, is much slower in action than the bark disease, and produces a stag-headed condition of the tree. It can be quite confidently stated that the bark disease does not yet occur south of Virginia and at only a few points in that State. Investigations are in progress to determine the origin of the bark disease in America and the details regarding its spread. The theory advanced in a previous publication of this bureau,^ that the Japanese chestnuts were the original source of infection, ha
. Chestnut blight. Chestnut blight; Chestnut. CHESTNUT TREE BLIGHT. 13 Agriculture, is associated with iasects, is much slower in action than the bark disease, and produces a stag-headed condition of the tree. It can be quite confidently stated that the bark disease does not yet occur south of Virginia and at only a few points in that State. Investigations are in progress to determine the origin of the bark disease in America and the details regarding its spread. The theory advanced in a previous publication of this bureau,^ that the Japanese chestnuts were the original source of infection, has been strengthened by many facts. It yet lacks much of demonstration, however, and is still advlanced only tentatively. While the disease has spread principally from the vicinity of New York there is much to indicate that it occurred at other points at an early date. Chester's Cytospora on a Japanese chestnut, noted at Newark, Del., ua 1902, may have been the bark disease. Observations by the junior writer in- dicate that this disease may have been present in an orchard in Bedford County, Va., as early as 1903, and that in Lan- caster County, Pa., it probably was present as early as 1905. All other points shown on the map outside of the area of general infection ap- pear to have been in- fected only within one or two years. The bark disease ap- pears practically to ex- terminate the trees in any locality which it in- fests. A survey of For- est Park, Brooklyn, showed "that 16,695 chestnut trees were killed in the 350 acres of ^„ , . i. v, .. n rinn ,„,.« woodland in this park alone. Of this number about 9,000 were between 8 and 12 inches in diameter, and the remaimng 7,000 or °^°I? :?e:el'pSS; Dr. W^ A Murrm estimates the,Randal loss from this disease "in and about New York City at between five and ten milUon ; The aggregate loss throughout the whole area of country affected must be much greater. TheSrk disease occurs on both chestnut and chmquapm
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