. 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 . into the tissues of the plantit feeds upon. It thus produces no external injury,nor any local internal effect discoverable by ordinarymethods of observation. Indications of injury by thisinsect are consequently all of a general character,affecting the entire plant, and do not materially differfrom those caused by severe drouth, except in th
. 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 . into the tissues of the plantit feeds upon. It thus produces no external injury,nor any local internal effect discoverable by ordinarymethods of observation. Indications of injury by thisinsect are consequently all of a general character,affecting the entire plant, and do not materially differfrom those caused by severe drouth, except in the factthat they are likely to be unequal in different partsof the same field in a way to indicate no connectionwith the amount of retained moisture in the soil. The 274 THE BOOK OF CORN root louse has been found on the plant as early asMay 9, only four days after the field was planted. The dwarfing of the plant, especially in patcheshere and there, with a yellowing or reddening of theleaves, beginning with the lowest ones, and a generalapparent lack of thrift and vigor, are sufficient to causesuspicion of injury by this louse. This will be con-firmed in part if numerous burrows of ants are seenin or near the hills. The presence of ants in the field. Fig 74—Winged Viviparous Female of Corn Root Aphis Greatly enlarged (after Forbes) may be overlooked after the ground has been recentlycultivated, but can scarcely escape attention shortlyafter rain, when these little insects actively open uptheir burrows, heaping up the little pellets of eartliabout the openings of their nests. The root aphis ofthe corn is of a bluish-green color, slightly whitenedby a waxy bloom. The form of the body is usuallyoval, with two short, slender, but conspicuous tubes onthe hinder part. These stand erect or project slightlybackward, and have open ends externally. They arecalled honey tubes, it having been formerly supposed CORN PESTS AND DISEASES 275 that they were the source of the abundant excretion
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