. 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 . isease. When the spores germinate they produce a white,mold-like growth of limited extent, on which are borneminute, colorless, secondary spores. If the fungousfilaments are submerged, the secondary spores areformed sparingly, but when they develop in moist airthese spores are produced in the greatest is the aerial, secondary s
. 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 . isease. When the spores germinate they produce a white,mold-like growth of limited extent, on which are borneminute, colorless, secondary spores. If the fungousfilaments are submerged, the secondary spores areformed sparingly, but when they develop in moist airthese spores are produced in the greatest is the aerial, secondary spores that are the directsource of infection. They are carried about by aircurrents, and falling upon the moist surface of anypart of the corn plant, not too mature, grow into theplant and cause smut pustu:3s. Under favorable con-ditions it requires only twenty-four hours to producesecondary spores after the black spores find a suitableplace in which to grow; and after the secondary sporesstrike the corn plant in growing condition but ten tofourteen days are needed for a mass of smut to form,which in a week longer will contain ripe spores. Itwill be seen that the reproduction of the fungus is veryrapid, three weeks being ample under favorable condi-. 3= < sE 00 288 THE BOOK OF CORN tions for completing the whole cycle of growth, noresting period being essential. Observations carefully tabulated have shown thatthe pustules become more numerous in a field of cornas the season progresses, unquestionably due to suc-cessive infections. Early planted corn is liable to showmore smut at the end of the season than late planted,simply because it has had a longer period in which tobecome infected. Corn planted upon extra rich orextra moist soil is more liable to infection, because therapid growth exposes more surface of tender tissuesand for a longer time. It must be remembered that thesecondary spores are only able to push their germinaltubes into soft tissues. They sometimes effect a
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