. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 512 ECONOMIC ZOOLOGY AND ENTOMOLOGY yellow stripes across the thorax and wing covers. Repeated attacks may kill the trees, and it is the safest policy to cut out and burn all infested trees in order that they may not serve as breeding places for new generations that will later attack sound trees. The Carpenter-worm (Prionoxystus robinia).—The larvae of a large, grayish, night-flying moth have come to be known as "carpenter worms" because they work so readily in the wood. FIG. 243.—Elm leaves curled by el
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 512 ECONOMIC ZOOLOGY AND ENTOMOLOGY yellow stripes across the thorax and wing covers. Repeated attacks may kill the trees, and it is the safest policy to cut out and burn all infested trees in order that they may not serve as breeding places for new generations that will later attack sound trees. The Carpenter-worm (Prionoxystus robinia).—The larvae of a large, grayish, night-flying moth have come to be known as "carpenter worms" because they work so readily in the wood. FIG. 243.—Elm leaves curled by elm aphis, Schizoneura nlmi. (Reduced.) of many of our shade trees. For some months after hatching the larvae burrow in the sapwood, and when several of them are at work in one tree they may kill it by girdling. As they grow older the larvae bore into the solid wood, making large burrows in which they live for a year or two longer before they change to pupae. As these borers are more apt to be found in trees that have the bark rough or scarred or wounded, care should be taken to keep the bark uninjured. The larvae. 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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