. The book of corn; a complete treatise upon the culture, marketing and uses of maize in America and elsewhere, for farmers, dealers, manufacturers and others--a comprehensive manual upon the production, sale, use and commerce of the world's greatest crop . curs all through the southern states, westto Kansas, and as far north as Maryland along thenorth shore of the Potomac river. The adult insectissues from the old cornstalks in the spring. Soonafter the young corn comes up it lays its eggs uponthe leaves near the axils, and the larva upon hatchingpenetrates the stalk at or near the joint and
. The book of corn; a complete treatise upon the culture, marketing and uses of maize in America and elsewhere, for farmers, dealers, manufacturers and others--a comprehensive manual upon the production, sale, use and commerce of the world's greatest crop . curs all through the southern states, westto Kansas, and as far north as Maryland along thenorth shore of the Potomac river. The adult insectissues from the old cornstalks in the spring. Soonafter the young corn comes up it lays its eggs uponthe leaves near the axils, and the larva upon hatchingpenetrates the stalk at or near the joint and commencesto tunnel, usually upward through the pith. Whenready to transform it bores to the surface of the stalk,making a hole for the exit of the future moth, then CORN PESTS AND DISEASES 267 cnanging to the pupa state. The damage done by thesecond generation consists largely in weakening thestalk so that it is readily blown down. Injury by thetirst generation results in serious harm to the crop,preventing the growth of the ears. Upon reachingmaturity, the larvae of the second generation do nottransform at once, but the majority of them pass thewinter as larvae. Early planted corn is more apt tobe infested than late corn. For instance, corn planted. Fig 70—The Larger Cornstalk Borer] a, female; 5, larva; c, pupa—all somewhat enlarged the first and second weeks in April, twenty-five percent was damaged; the third and fourth weeks, twentyper cent; May I to 15, fifteen per cent; of that plantedMay 15 to 31, twelve per cent; June 1, eight per fact, corn planted after June 1 was practicallyuninfested. See Fig 88, showing work of the largercornstalk borer. With the more careful and thorough methods ofcultivation in the North this insect in all probabilitvwill not thrive. Dr L. O. Howard, entomologist of 258 THE BOOK OF CORN the United States department of agriculture, thinksit will reach* its maximum in localities like parts ofSouth Carolina, where corn is simply strippe
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