. Eastern forest insects . F-519935 Figure 8.—Formosan subterranean termite colony and damage: left, carton nest and damaged wood above a window inside a building; right, colony of workers in a cypress log. Nonsubterranean Termites Several species of nonsubterranean termites occur in the East- ern States. They are found throughout the state of Florida; also in a narrow strip along the Atlantic Coast as far north as south- eastern Virginia, and westward along the Gulf Coast to Mexico. Infestations are found in structural timber and other woodwork in buildings; in furniture; in utility poles; in
. Eastern forest insects . F-519935 Figure 8.—Formosan subterranean termite colony and damage: left, carton nest and damaged wood above a window inside a building; right, colony of workers in a cypress log. Nonsubterranean Termites Several species of nonsubterranean termites occur in the East- ern States. They are found throughout the state of Florida; also in a narrow strip along the Atlantic Coast as far north as south- eastern Virginia, and westward along the Gulf Coast to Mexico. Infestations are found in structural timber and other woodwork in buildings; in furniture; in utility poles; in wooden derricks and piled lumber; in wood pulp or fiber insulation boards; in other products containing cellulose; and in trees and other plants. Be- cause of their ability to live in wood that is frequently moved, nonsubterranean termites are often found in regions far removed from their normal range, including Canada. None of these are able to establish permanent infestations (675). Nonsubterranean termites fly directly to and enter untreated and unpainted wood at swarming time. They cut across the grain of the wood and excavate broad pockets or chambers, connected by tunnels of small diameter. They feed on both the soft spring wood and the harder summer wood. Their cavities contain com- pressed pellets of partly digested wood. Some pellets are also pushed to the exterior through small holes and are found in piles on the floors of infested buildings (fig. 9). Nonsubterranean termite colonies contain only two castes of adults: reproductives and soldiers. Since there is no worker caste, the work of the colony is performed by young nymphs. Winged adults are distinguished by the presence of branches between the upper rim of the wing and the first long vein. These are absent in winged subterranean termites. Soldiers differ from the soldiers of subterranean termites in having their mandibles lined with teeth on the inner edge. Winged adults usually swarm during the early evening
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
