. Manual of fruit diseases . Fruit. no MANUAL OF FRUIT DISEASES point of union with the root. IMature galls ma>" measure from one to several inches in diameter, are dark in color, with a roughened surface, and usually hard. Young galls are comparatively small, greenish, or some- times slightly flesh- colored, relatively smooth, and soft or even spongy. The second form of the disease, hairy-root, is quite unlike the gall form just described. As the name suggests there is an excessive production of small fibrous roots, which give to the system a hairy appearance (Fig. 31). These may be g
. Manual of fruit diseases . Fruit. no MANUAL OF FRUIT DISEASES point of union with the root. IMature galls ma>" measure from one to several inches in diameter, are dark in color, with a roughened surface, and usually hard. Young galls are comparatively small, greenish, or some- times slightly flesh- colored, relatively smooth, and soft or even spongy. The second form of the disease, hairy-root, is quite unlike the gall form just described. As the name suggests there is an excessive production of small fibrous roots, which give to the system a hairy appearance (Fig. 31). These may be grouped into several types, as follows : (a) a simple type, in which numerous small roots grow out at nearly right angles single or in tufts from an older root or stem; (6) a woolly form which originates from a smooth irregular swelling usually on the larger roots near the sur- FiG. 31. —Hairy-root of apple. f^Ce of the Soil ; (c) a broom-like formation in which there is excessive branching of the roots at the ends. Both the crown-gall and hairy-root forms of the disease. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hesler, L. R. (Lexemuel Ray); Whetzel, Herbert Hice, 1877-1944. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
