. Bulletin. Agriculture. Fig. 1.—Infested section of oak covered with alloys and building paper in layers, but with narrow strip of sheet steel that was placed between layers of lead aUoy and top layer of alloy removed. Shows beetles in holes where they were stopped by steel. Photograph by Fig. 2.—Section of infested oak with all the layers of alloy removed, showing how many of the beetles attempted to escape from the sides instead of boring through the alloys. Photograph by H. E. Fig. .3.—Infested section of oak covered with alloys and building paper in layers. Beetles have
. Bulletin. Agriculture. Fig. 1.—Infested section of oak covered with alloys and building paper in layers, but with narrow strip of sheet steel that was placed between layers of lead aUoy and top layer of alloy removed. Shows beetles in holes where they were stopped by steel. Photograph by Fig. 2.—Section of infested oak with all the layers of alloy removed, showing how many of the beetles attempted to escape from the sides instead of boring through the alloys. Photograph by H. E. Fig. .3.—Infested section of oak covered with alloys and building paper in layers. Beetles have emerged through all except where nar- row strip of sheet steel was placed between layers of lead alloy. Photograph by H. E. Burke. THE LEAD-CABLE BORER Fig. 4.—Same as Figure 1, except that next layer of alloy has been removed. The larger hole was made by the round-head borer Xylo- trechus nauticus. Photograph by H. E. 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. Dept. of Agriculture. Washington : Dept. of Agriculture
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectagriculture, bookyear
