. Manual of fruit diseases . Fruit. PEAR DISEASES 345 Pacific Coast Rust Caused by Gymnosporangium Libocedri (P. Henn.) Kern = G. Blas- daleanum (Diet, and Hohv.) Kern This is one of the recently recognized rusts of the pear family. The name Pacific Coast rust is used in contradistinction to eastern rust of pear (see page 341). The disease here consid- ered was discovered in Oregon on cultivated pear several years ago, but was first given special attention in 1907. Since that date it has been found annually in Oregon and was par- ticularly abundant in 1913. It is believed on good authority tha
. Manual of fruit diseases . Fruit. PEAR DISEASES 345 Pacific Coast Rust Caused by Gymnosporangium Libocedri (P. Henn.) Kern = G. Blas- daleanum (Diet, and Hohv.) Kern This is one of the recently recognized rusts of the pear family. The name Pacific Coast rust is used in contradistinction to eastern rust of pear (see page 341). The disease here consid- ered was discovered in Oregon on cultivated pear several years ago, but was first given special attention in 1907. Since that date it has been found annually in Oregon and was par- ticularly abundant in 1913. It is believed on good authority that this rust will in time become one of the most important pear troubles within its present range. It is most common on the native hosts, Oregon crab and its apple-hybrids, the haw- thorn and service-berry. It also occurs on the ornamentals mountain-ash, Japanese quince, Japanese pear and flowering crab. It is common on the cul- tivated quince, but is rare on the cultivated apple. Symptoms. The foliage (Fig. 95), fruit (Fig. 96) and stems are affected, and in each case there results some distortion. Yellow or orange spots develop on the affected parts; within the discolored. Fig. 95. — Pacific Coast rust on pear-leaves. area cup-like bodies with white margins are visible to the unaided eye. The fungus affects the incense cedar (Libocedrus decurrens), symptoms show- ing as brownish pustules on the leaves (Fig. 97). Some-. 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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