. Bulletin - Biological Survey. Zoology, Economic. Fig. 31.—Yellow-bellied sapsucker. In November, 1900, 7 of the 9 trees were dead and the others were dying. A strip of bark T inches long b}^ 2 wide, where the sapsuckers had worked in 1896, was torn off and found to contain 81 drills, an aver- age of 6 to the square inch. Many of them were so close together that the tissue between had broken down, leaving rents in the bark an inch or two long, and in some places almost girdling the tree. The loss 3f sap must have been an exhausting drain, but it was not the sole cause of death. Beetles of the
. Bulletin - Biological Survey. Zoology, Economic. Fig. 31.—Yellow-bellied sapsucker. In November, 1900, 7 of the 9 trees were dead and the others were dying. A strip of bark T inches long b}^ 2 wide, where the sapsuckers had worked in 1896, was torn off and found to contain 81 drills, an aver- age of 6 to the square inch. Many of them were so close together that the tissue between had broken down, leaving rents in the bark an inch or two long, and in some places almost girdling the tree. The loss 3f sap must have been an exhausting drain, but it was not the sole cause of death. Beetles of the flat-headed apple borer, attracted by the. 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 United States. Bureau of Biological Survey. Washington : Govt. print. off.
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