. An annotated list of the important North American forest insects. Forest insects. 8 Farmers' Bulletin 1^72 against attack by subterranean termites, and the onl}' relief from their presence. These insects must maintain contact with the ground to obtain the moisture necessary for their existence. When contact with their moisture supply in the earth is cut off, the subterra- nean insects in the damaged Avood, no matter how numerous, soon dry up and die. Foundations, supports, etc.—To prevent subterranean termites fi'om reaching the woodwork of buildings from their nests in the ground, the found
. An annotated list of the important North American forest insects. Forest insects. 8 Farmers' Bulletin 1^72 against attack by subterranean termites, and the onl}' relief from their presence. These insects must maintain contact with the ground to obtain the moisture necessary for their existence. When contact with their moisture supply in the earth is cut off, the subterra- nean insects in the damaged Avood, no matter how numerous, soon dry up and die. Foundations, supports, etc.—To prevent subterranean termites fi'om reaching the woodwork of buildings from their nests in the ground, the foundations of buildings should be constructed, if possible, entirely of stone, brick, concrete, or concrete and steel,* including the pillars in the basement or cellar. The Avails, partitions, and flooring in the ground floor, basement, or cellar should also be of con- crete. Wooden floor- ing can be laid over this concrete floor if desired. If the floor- ing is to be of con- crete, the concrete should be laid on a gravel base. In buildings where stone, brick, or con- crete foundations are impracticable, timber impregnated with coal-tar creosote should be employed, and no imtreated wood should come in contact with ground which may be infested with termites. Wood to be protected from termites should be im- pregnated with coal-tar creosote by either the cylinder-pressure or the " open-tank " process. Full details regarding these processes can be obtained from the United States Forest Products Laborator}^, Madison, Wis. The open-tank process is simpler, can be made to give satisfactory results where pi'operly used, and can be operated by unskilled labor. If for any reason neither of the foregoing processes can be used, three coats of hot coal- tar creosote brushed on the wood, with sufficient intervals betAveen brushings to permit each coat to dry, Avill be fairly effective. This. Fig. 9.—Damage by the sul> terranean termite Rcticuli- termcs to shoe stored
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
