Corn; growing, judging, breeding, feeding, marketing; for the farmer and student of agriculture, a text-book for agricultural colleges and high schools

Description:

Identifier: corngrowingjudgi00bowm (find matches)
Title: Corn; growing, judging, breeding, feeding, marketing; for the farmer and student of agriculture, a text-book for agricultural colleges and high schools
Year: 1908 (1900s)
Authors: Bowman, Melville LeRoy, 1881- (from old catalog) Crossley, Bruce William, 1886- (from old catalog) joint author
Subjects: Corn
Publisher: Ames, Ia., The authors
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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s in sucking the liquid food from the grow-ing plant. Close examination reveals no outward injury from thissource, but the plant will present a dwarfed appearance, especially incertain patches in the field, sometimes on low ground. The leaveswill take on a yellowish or reddish cast, the lower ones being afifectedfirst, and later the whole plant shows a lack of thrift and vigor. The adult aphis is bluish green in color. It can thus be distin-guished from the grass louse, which is white with a blackish head,there being no appearance of green. The eggs are laid in the falland the ants store them away over winter. The first hatching gen-erally takes place in the spring before the corn is planted, the youngliving for a time on the roots of weeds which are laid bare by theants. Smartweed is especially liked by the young aphids.. As sooras the young corn plant starts, the ants immediately remove the aphidsfrom the roots of the weeds to the corn roots. The ants have been Bluish green in color
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PLATE V. The Corn Root-Louse, (Aphis maidiradicis). B, the common wingless and, A, thewinged viviparous females; F,the pupa of the winged female; C.the oviparous female, occuringin autumn, and D, its egg; E, the worker of the root-louse ant (Lasiiis niger atncricanus). :OURTESY OF PROFESSOR : FORBES, ILLINOIS STATE ENTOMOLOGt! I CHINCH BUG. 243 known to burrow hills of corn in advance and seize the winged aphidsthat would happen that way and bear them to their subterranean homeon the roots of the corn plant. The first generation of the corn-rootaphis is wingless, and is therefore confined to fields previously incorn. The second generation consists both of winged and wingless generationsaphids. The winged aphids may travel to other fields, but they gen- seasonerally do not become sufficiently numerous to aflfect fields not in cornthe previous year. It is generally November before those of the vivi-parous generation (those producing living young) are all dead. Afterthis time the sexual

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