. Eastern forest insects. Forest insects. Figure 7. -Soldier castes of the Formosan subterranean termite Coptotermes formosanus. Formosan subterranean termite nests are constructed from a friable material called carton. It consists of a mixture of masti- cated wood, saliva, and excrement. A nest may be several cubic feet in size. Tunnels radiate from nests constructed in the soil. They can be found at depths of 10 feet in the earth, and they can extend horizontally to 200 feet. Their walls are lined with essen- tially the same materials used in constructing the nest and they are nearly impervi
. Eastern forest insects. Forest insects. Figure 7. -Soldier castes of the Formosan subterranean termite Coptotermes formosanus. Formosan subterranean termite nests are constructed from a friable material called carton. It consists of a mixture of masti- cated wood, saliva, and excrement. A nest may be several cubic feet in size. Tunnels radiate from nests constructed in the soil. They can be found at depths of 10 feet in the earth, and they can extend horizontally to 200 feet. Their walls are lined with essen- tially the same materials used in constructing the nest and they are nearly impervious to water. Primary queens can lay up to 1,000 eggs per day, and a single colony may contain hundreds of thousands of individuals. Winged reproductives swarm during May and June. They are poor fliers, and the majority drop to the ground within 100 yards of the nest unless carried farther by the wind. First evidence of a colony's presence may be the ap- pearance of these winged adults at swarming time. Large colonies can cause severe damage in a short time (fig. 8A). In Hawaii, walls of new buildings have been hollowed out in three months' time. Living trees are also hollowed out (fig. 8B) and weakened. Known susceptible trees in the South are the Chinese elm, several species of oak, hackberry, and Arizona ash. Dead trees are highly susceptible. Extensive damage all the way to the top of 70-foot-tall cypress snags has been observed in Louisiana (). 51. 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 Baker, Whiteford L. (Whiteford Lee), 1903-. Washington : U. S. Dept. of Agriculture, Forest Service ; for sale by the Supt. of Docs. , U. S. G. P. O
Size: 1143px × 2187px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
