. Manual of fruit diseases . Fruit. 98 MANUAL OF FRUIT DISEASES extent that the tree may be blown over under the strain of a heavy crop of fruit; (3) affected trees in bearing usually fail to mature their fruit, particularly in cases of severe infection; or the fruit matures poorly, is stunted and is of an inferior quality; (4) diseased trees often lack the normal amount of foliage ; (5) affected plants make little or no growth. Syviptoms of Armillaria root-rot. Evidence of this trouble varies with the part affected and there are no visible signs until consider- able progress has been made by
. Manual of fruit diseases . Fruit. 98 MANUAL OF FRUIT DISEASES extent that the tree may be blown over under the strain of a heavy crop of fruit; (3) affected trees in bearing usually fail to mature their fruit, particularly in cases of severe infection; or the fruit matures poorly, is stunted and is of an inferior quality; (4) diseased trees often lack the normal amount of foliage ; (5) affected plants make little or no growth. Syviptoms of Armillaria root-rot. Evidence of this trouble varies with the part affected and there are no visible signs until consider- able progress has been made by the pathogene. A striking charac- teristic is the marked localization and the slow development of the disease. The a\'erage observer will not suspect the presence of root-rot until indi\'iduals or groups of trees die among many other ap- parently healthy ones. At some point it will then be found upon careful examination that the tree is girdled (Fig. 26) and that finally the top dies. Accompanying this phenomenon is a profuse develop- ment of string-like, hard, black, shiny, much-branched strands, aV to ya of an inch in diameter, in the soil at the base of the tree (Fig. 27). These strands have a peculiar mushroom odor and a tough texture. From these rhizomorphs, as they are called, numerous whitergilled, honey-colored mushrooms may arise in the autumn (Fig. 27). The mushrooms may be found at the base of the affected tree or at some distance along the Fig. 26. — Armillaria root-rot; note the girdling of the 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
Size: 1093px × 2288px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
