 | 1890 - 632 páginas
...the place of their entrance The seat of their operations is known by the oozing of the sap and the dropping of the sawdust from the holes. The bark around...will become disfigured and weakened by large porous tumors, caused by the effort of the trees to repair the injuries they have suffered The grubs attain... | |
 | Entomological Society of Ontario - 1872 - 492 páginas
...open new holes through the bark. The seat of their operations is known by the oozmg of the sap and the dropping of the sawdust from the holes. The bark around...part attacked begins to swell, and in a few years the trunks and limbs will become disfigured and weakened by large porous tumours, caused by the efforts... | |
 | Ontario. Legislative Assembly - 1874 - 1042 páginas
...new holes through the bark. The seat of their operations is known by the oozing of the sap, and the dropping of the sawdust from the holes. The bark around...part attacked begins to swell, and in a few years the trunks and limbs will become disfigured and weakened by large porous tumours caused by the efforts... | |
 | New York (State). Department of Agriculture - 1917 - 1008 páginas
...trunk of the tree. The seat of their operations is known by the oozing of the sap and the dropping of sawdust from the holes. The bark around the part attacked begins to swell, and in a few years the trunks and the limbs become disfigured by large porous tumors. The grubs attain their full size by... | |
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... the passage becomes clogged and the burrow more or less filled with the coarse and fibrous fragments of wood, to get rid of which the grubs are often obliged to open new holes through the bark. The seat of their operations is known by the oozing of... 
