. The cotton plant : its history, botany, chemistry, culture, enemies, and uses. Cotton; Cotton. 294 THE COTTON PLANT. seems to be confined to certain localities. The author has observed it at quite a number of places in Alabama, but only at Brundidge was any very serious injury to the fruit noted. At that place, in September, 1891, 10 to 50 per cent of the crop was destroyed on some plantations. In the vicinity of Auburn, while it occurs on other parts of the plant as well as the bolls, its greatest injury seems to be confined to the young plants. Character* of the disease on the hotls.—The d
. The cotton plant : its history, botany, chemistry, culture, enemies, and uses. Cotton; Cotton. 294 THE COTTON PLANT. seems to be confined to certain localities. The author has observed it at quite a number of places in Alabama, but only at Brundidge was any very serious injury to the fruit noted. At that place, in September, 1891, 10 to 50 per cent of the crop was destroyed on some plantations. In the vicinity of Auburn, while it occurs on other parts of the plant as well as the bolls, its greatest injury seems to be confined to the young plants. Character* of the disease on the hotls.—The disease on the bolls origi- nates in minute spots. These spots, when very small, are of a dull reddish color, and present minute shallow depressions of the surface tissue. As these spots eidarge the tissue black- ens until the development of the spores begins. These are developed in pustules, usually conflu- ent, in the center of the nearly circular spot. With their development the color of the spot changes. If there are a few spores it becomes a dirty gray, or a bright pink if the spores are numerous. Where the spores are few in number, many of them stand out upon the sur- face on threads which have grown up through the tissue. The spores being colorless, a grayish cast is given to the dark background of diseased tissue. When the spores are developed in great numbers they are piled up into a considerable heap and form a large confluent mass occupying the central portion of the spot. A pink pigment, given off by the spores, is produced here in such quantities that it can be seen. This gives the pink color to the spots. As the disease progresses the spots increase in size and the color bands which surround the spots move outward centrifugally. The outer band, which is the border of the spot, is dull reddish brown in color, and its outer limits are ill defined. Inside of this border is a blackish band, which borders the pink center. As the spots increase in size they frequently
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherwashi, bookyear1896
