. Manual of fruit diseases . Fruit. 106 MANUAL OF FRUIT DISEASES composed of a thin felt of dark-brown interwoven threads which are seen with the naked eye or better with a hand-lens. Fly-speck (Fig. 29), while formerly regarded as distinct from sooty-blotch, is now considered simply as a different symptom of the same disease. The two are found in the same situations and under similar conditions except that fly - speck develops later than sooty- blotch. Fly-speck needs little description (Fig. 29). Groups of a half dozen to one hundred black, shiny dots appear on the surface of an apple; the s
. Manual of fruit diseases . Fruit. 106 MANUAL OF FRUIT DISEASES composed of a thin felt of dark-brown interwoven threads which are seen with the naked eye or better with a hand-lens. Fly-speck (Fig. 29), while formerly regarded as distinct from sooty-blotch, is now considered simply as a different symptom of the same disease. The two are found in the same situations and under similar conditions except that fly - speck develops later than sooty- blotch. Fly-speck needs little description (Fig. 29). Groups of a half dozen to one hundred black, shiny dots appear on the surface of an apple; the specks resemble closely those made by the fly (Fig. 29). Both sooty-blotch and fly-speck are â very superficial in nature, and there is no hardening or cracking of the apple skin as in scab. Cause. The pathogene causing the disease was described on Newtown Pippins from the state of Pennsylvania in 1831. More atten- tion was paid to the fungus than to its effects on the apple. It is suggested that, since it was discovered in America nearly a century ago, the pathogene was carried across the ocean from the United States to England. It has frequently been observed, for many years, in English markets on American-grown apples. On its discovery in the latter country, in 1910, its history with particular reference to its origin aroused great curiosity. Eng- lish growers of fruit had not forgotten their experience with in-. FiG. 29. â 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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