. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 514 ECONOMIC ZOOLOGY AND ENTOMOLOGY FOREST INSECTS A certain amount of insect injury is occurring in almost every great forest all the time, while from time to time particular forests are devastated by the outbreaks of certain insects that kill practically all of the trees in the affected regions. In some instances these outbreaks have spread over 50,000 square miles,. FIG. 245.—Work of a bark-borer, Phlceosiniis cristatus, on Monterey cypress. (Reduced.) and trees that would have produced millions of feet of lumb
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 514 ECONOMIC ZOOLOGY AND ENTOMOLOGY FOREST INSECTS A certain amount of insect injury is occurring in almost every great forest all the time, while from time to time particular forests are devastated by the outbreaks of certain insects that kill practically all of the trees in the affected regions. In some instances these outbreaks have spread over 50,000 square miles,. FIG. 245.—Work of a bark-borer, Phlceosiniis cristatus, on Monterey cypress. (Reduced.) and trees that would have produced millions of feet of lumber have been destroyed. Each year there are lesser outbreaks when, although comparatively few trees may be killed, many are retarded in their growth or so distorted or injured that they make only second- or third-class lumber. Altogether the. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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