. Protecting log cabins, rustic work, and unseasoned wood from injurious insects in the eastern United States. Forest insects; Wood Preservation. PROTECTING LOG CABINS, RUSTIC WORK, FROM INSECTS 11 ing for favorable woods on which to lay their eggs. During the rest of the year, however, these in- sects hibernate in various stages and only a very few or no adult beetles are present. The bark beetles and ambrosia beetles are active nearly the en- tire period within the months specified. Their numbers vary greatly within the season of ac- tivity. These insects mature very rapidly and can develop
. Protecting log cabins, rustic work, and unseasoned wood from injurious insects in the eastern United States. Forest insects; Wood Preservation. PROTECTING LOG CABINS, RUSTIC WORK, FROM INSECTS 11 ing for favorable woods on which to lay their eggs. During the rest of the year, however, these in- sects hibernate in various stages and only a very few or no adult beetles are present. The bark beetles and ambrosia beetles are active nearly the en- tire period within the months specified. Their numbers vary greatly within the season of ac- tivity. These insects mature very rapidly and can develop from the egg to the adult stages in 4 to 6 weeks. They may have as many. F-4S0492 Figure 15.—Grubs of a flatheaded borer (Chalcophora angulicollis (Lec.)). as 3 and often 5 generations a year in certain parts of the South. The wood borers are not active for so long a period during the season as are the other two classes of beetles and do not mul- tiply so rapidly. Many of them have one generation a year, and others have only one every 2 years. The red-shouldered powder-post beetle is the most destructive of this group and flies in the vicinity of Washington, , mainly from early May to the middle of June,. 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 St. George, R. A. (Raymond Alexander), b. 1894. Washington] U. S. Dept. of Agriculture; [for sale by the Supt. of Docs. , U. S. Govt. Print. Off.
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Keywords: ., bookcentury1900, booksubjectforesti, booksubjectwoodpreservation
