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" ... before the beetles leave the bark. For the eastern spruce beetle: (1) Regulate the winter cutting so as to include as many of the infested, dying, and dead trees as possible, and place the logs from tnem in water before the first of June... "
Bulletin
1901
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Insects Affecting Forest Trees

Ephraim Porter Felt - 1905 - 98 pàgines
...logs of the same be placed in water before June ist. Secondly, that the summer cutting be so regulated that as many recently attacked trees as possible may...and the bark removed from their trunks and stumps, and, thirdly, that a large number of trees not infested be girdled where logging operations will be...
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Insects Affecting Park and Woodland Trees, Volum 1

Ephraim Porter Felt - 1906 - 604 pàgines
...and then placing the logs from the same in water before the first of June. He also advises arranging the summer cutting so that as many recently attacked...and the bark removed from their trunks and stumps. He suggests, in badly infested areas where logging operations will or can be conducted the following...
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Bulletin of the U.S. Department of Agriculture, Edicions 526-550

1920 - 1048 pàgines
...from tnem in water before the first of June; (2) regulate the summer cutting so that as manyrecently attacked trees as possible may be cut and the bark removed from the trunks and stumps; (3) girdle, early in June, a large number of trees, in the vicinity ol infested...
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The Red Spruce: Its Growth and Management

Louis Sutliffe Murphy - 1917 - 122 pàgines
...dead trees as possible, and place the logs from tnem in water before the first of June; (2) regulate the summer cutting so that as many recently attacked...trees as possible may be cut and the bark removed from the trunks and stumps; (3) girdle, early in June, a large number of trees, in the vicinity of infested...
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Pamphlets on Dendrology, Volum 4

1907 - 1092 pàgines
...possible, and place the logs from tnem in water before the first of June; (2)regulute tho summer cut ting so that as many recently attacked trees as possible may be cut and the bark removed from the trunks and stumps; (3) girdle, early in June, a large number of trees, in the vicinity oí infested...
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