. Manual of fruit diseases . Fruit. APPLE DISEASES 65 Symptoms. The presence of apple-rust in any localit}- may be detected by examining the apple or the cedar. On the apple leaves young spots may be fovuKl from April to June. At first these are seen on the upper surface as minute pale-yellow areas. Fig. 17. â Apple-rust; on lower surface (on leaf at extreme left), and on upper surface (three leaves on right). (Fig. 17, right). These enlarge, become darker, and finally are orange-colored. On the upper surface of the spots the fruiting bodies of the pathogene develop, first as minute, yellow, f
. Manual of fruit diseases . Fruit. APPLE DISEASES 65 Symptoms. The presence of apple-rust in any localit}- may be detected by examining the apple or the cedar. On the apple leaves young spots may be fovuKl from April to June. At first these are seen on the upper surface as minute pale-yellow areas. Fig. 17. â Apple-rust; on lower surface (on leaf at extreme left), and on upper surface (three leaves on right). (Fig. 17, right). These enlarge, become darker, and finally are orange-colored. On the upper surface of the spots the fruiting bodies of the pathogene develop, first as minute, yellow, flask-shaped pustules, which finally turn black (Fig. 17). The leaf tissues beneath the spots become swollen and on the lower surface another kind of fruiting body is produced (Fig. 17, left). This one is cup-shaped and considerably larger than 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
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
