. Bulletin. Agriculture. 10 BULLETIN 1107, U. S. DEPARTMENT OF AGRICULTUEE, are through with a sec- • tion of wood, nothing remains but the bark and enough solid wood to hold the mines to- gether. All of the rest is reduced to numerous holes (the egg galleries and exit holes) and the winding larval mines closely packed with the meal-like boring dust. (Figs. 7 and 8.) In special cases the beetles may attack and kill living trees. On September 28, 1919, Mr. Hartman found a cherry tree {Prunivs avium) in Los Gatos, Calif., with the foliage fading. Close exami- nation showed numer- ous small holes
. Bulletin. Agriculture. 10 BULLETIN 1107, U. S. DEPARTMENT OF AGRICULTUEE, are through with a sec- • tion of wood, nothing remains but the bark and enough solid wood to hold the mines to- gether. All of the rest is reduced to numerous holes (the egg galleries and exit holes) and the winding larval mines closely packed with the meal-like boring dust. (Figs. 7 and 8.) In special cases the beetles may attack and kill living trees. On September 28, 1919, Mr. Hartman found a cherry tree {Prunivs avium) in Los Gatos, Calif., with the foliage fading. Close exami- nation showed numer- ous small holes in the bark at the bases of the branches and buds and in rough spots on the bark of the trunk. Some of these holes contained Scobicia beetles and many of them were the en^ trances to galleries which encircled the branch or trunk just beneath the surface of the outer wood. No other cause for the dy- ing of the tree could be discovered. No eggs or larvse were found. In the laboratory at Los Gatos, numerous beetles which emerged from the wood stored for rearing purposes entered a cedar cigar box containing large vials of alcoholic speci-. al,-. 7.—Work Oif the California lead-cable borer in Cali- fornia live oak (Quercus agrifolia), Los Gatos, Calif. Note that the wood is " ; The larger holes were made by a roundheaded borer. Natural 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
