. An annotated list of the important North American forest insects. Forest insects. Farmers' Bulletin U72 although sometimes these insects enter trees under bark loosened by sunburn, etc., or through scars or borer holes, provided sufficient moisture is present. Nonsubterranean termites enter the wood directly, or, in the case of trees, through wounds or borer holes or under loose bark; moisture is not neces- sary. In the new quarters eggs are laid, the young develop, and in a few years the colony increases in numbers, and the " workers" are able to feed and care for the repro- ducti
. An annotated list of the important North American forest insects. Forest insects. Farmers' Bulletin U72 although sometimes these insects enter trees under bark loosened by sunburn, etc., or through scars or borer holes, provided sufficient moisture is present. Nonsubterranean termites enter the wood directly, or, in the case of trees, through wounds or borer holes or under loose bark; moisture is not neces- sary. In the new quarters eggs are laid, the young develop, and in a few years the colony increases in numbers, and the " workers" are able to feed and care for the repro- ductive forms — the " king" (title page, left) and "queen" (title page, right)—as well as the soldiers (fig. 12, a), Avhich are sterile forms adapted to protect the colony from insect enemies, notably the true ants. In recently formed young colonies the rate of egg laying is slow, but mating is repeated, and, al- though there is at first a gradual increase, later the increase in the numbers of the broods is rapid. In old colonies there are thousands and tens of thousands of indi- viduals. Egg lajdng occurs over a considerable ]:)eriod during the warm months in col- onies out of doors. .„ . In infested buildings artihcially heated, where an even temperature is maintained, the insects are active and may lay eggs every month of the year. The number of eggs laid depends on Fig 3.—Damage to oak flooring hv tlic ((ininion vastcvn subterranean termite Reticulitermes flavipes. Note that damage is not apparent on upper surface. 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 Craighead, Frank C. (Frank Cooper), 1890-; Perry, George S; Snyder, Thomas Elliott, b. 1885; Hopkins, A. D. (Andrew Delmar), 1857-1948; MacAloney, Harvey John, 1896-; Graham, Samuel Alexander, 1891-; Peirson, Henry By
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
