. Manual of fruit diseases . Fruit. PEACH DISEASES 295 does not cause injury sufficient to make spraying for its control a profitable or necessary operation. Symptoms. The fruits, leaves and twigs are affected. On the fruit (Fig. 78) small, round, olive-black spots begin to show about six weeks after the blossoms fall, or from June 15 until July 10, depending on the variety. Lesions most frequently occur on the upper side of the fruit. If the spots are numerous, they coalesce, forming a large, irregular diseased area covering a greater portion of the fruit's surface (Fig. 78) and preventing th
. Manual of fruit diseases . Fruit. PEACH DISEASES 295 does not cause injury sufficient to make spraying for its control a profitable or necessary operation. Symptoms. The fruits, leaves and twigs are affected. On the fruit (Fig. 78) small, round, olive-black spots begin to show about six weeks after the blossoms fall, or from June 15 until July 10, depending on the variety. Lesions most frequently occur on the upper side of the fruit. If the spots are numerous, they coalesce, forming a large, irregular diseased area covering a greater portion of the fruit's surface (Fig. 78) and preventing the normal expansion of the skin as well as interfering with. Fig. 78. — Peach-scab; types of lesions on the fruit. the ripening and mellowing of the flesh. The fruit often be- comes one-sided, due to a formation of a protective cork-layer under the diseased area. This layer is incapable of further growth, and hence an ill-formed fruit results. Often the cork- layer is ruptured, leaving deep cracks (Fig. 78) through which the brown-rot pathogene enters (see page 275). Attacks are generally most noticeable on the late varieties, due, in part perhaps, to the fact that the fruit of such varieties is exposed to infection over a longer period. Of the commercial varieties, the Heath is said to be most susceptible. The Bilyen and Hill's Chili are also badly affected, and the Salway, Smock and Morris' White suffer severely. The Elberta is sometimes badly dis- eased, but is more resistant than those just mentioned. The Carman, Hiley, Champion and Belle are sUghtly affected. Trees. 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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