File:The larger corn stalk-borer (1910) (14781228082).jpg

Identifier: largercornstalkb2116ains (find matches)
Title: The larger corn stalk-borer
Year: 1910 (1910s)
Authors: Ainslie, George G United States. Bureau of Entomology United States. Dept. of Agriculture
Subjects: Corn-stalk borer Corn Diseases and pests Agricultural pests Control
Publisher: Washington, D.C. : U.S. Dept. of Agriculture, Bureau of Entomology
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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first generation, spinning a silken thread behind it, wandersdown into the throat of the plant as far as the water or dew usuallystanding there will allow it to go, and begins to feed on the leaves,going back and forth through the yet unfolded clusters and soonriddling the more tender leaves with aimless burrows. If the bur-row reaches the tender terminal bud where the future joints arebeing formed, further growth at that point ceases and the plant be-comes stunted and misshapen, with no tassel. As the plant continuesto mature, the larva grows out, as the farmers say. It is more LCir. 116) likely that it is the evidences of its work and not the larva itselfthat grow out; but for whatever reason, the caterpillar soon leavesthe more leafy portion of the plant and attacks the stalk at or nearthe ground. Here a hole is cut through the outer wall of the stalkand the larva burrows upward for a short distance, after which itseems to run aimlessly through the pith, frequently even leaving the
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Fig. 3.—The larger corn stalk-borer : Larva in lower part of corn plant preparatory tohibernation. Reduced. (Original.) stalk entirely and reentering it at another point. Turning upward,the caterpillar, when fully grown, bores toward the outside andcuts a circular hole in the outer wall of the stalk. Then, afterspinning a few loose threads across this opening to keep out un-desirable visitors, it retreats a short distance, plugs the burrow belowwith digested pith, and in the chamber thus created slowly changesto the next or pupal stage (fig. 4, c). (Cir. 116) Seldom is the stalk damaged above the third joint from the ground,although the larvae, when small, are found in the large midribs ofthe lower leaves and later in the season, when the food supply isrestricted, even in succulent nubbins farther up. The)T sometimesalso penetrate the underground part of the stalk in feeding and entersome of the larger brace roots for a short distance. The larvae of the second generation work in a s

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