. Chestnut blight. Chestnut blight; Chestnut. 6o2 Bulletin 347 and fifty-six. On reinspection, twenty-eight out of the forty-two spots showed no recurrence of the bUght; in three cases a single new infection was found, and in six cases there were two recently infected trees. The highest number of new infections numbered thirteen trees. In the forty-two spots aver- aging original infected trees each, one hundred and fif ty- six re infections occurred, or 3 . 7 infections per spot. In two thirds of the forty-two spots no blight reappeared, and the new infections which developed in the rema
. Chestnut blight. Chestnut blight; Chestnut. 6o2 Bulletin 347 and fifty-six. On reinspection, twenty-eight out of the forty-two spots showed no recurrence of the bUght; in three cases a single new infection was found, and in six cases there were two recently infected trees. The highest number of new infections numbered thirteen trees. In the forty-two spots aver- aging original infected trees each, one hundred and fif ty- six re infections occurred, or 3 . 7 infections per spot. In two thirds of the forty-two spots no blight reappeared, and the new infections which developed in the remainder equaled only two sevenths of the number of trees originally diseas- ed. These spots were located in the region of very slight in- fection in Elk, Clear- field, Center, and Fulton ; The results of the oldest experiment that is reported are as follows (pages 32-33 of the same report): " In order to get information concern- ing the effectiveness of two different methods of cutting out diseas- ed chestnut, a stump- to-stump count of 100 stumps each was made in November, 1912, on two different tracts located at Haverford. In one of the woodlots the infected trees were cut in the fall of 1910, and the stumps peeled, and all brush destroyed by burning, but the burning was not done over the stimnps. On this tract a hundred stumps had 1354 vigorous. Fig. 99.— Culling down the tree that has been peeled at the base. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original 1906-1960
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