. Diseases of economic plants. Plant diseases. 180 DISEASES OF ECONOMIC PLANTS be set where the disease has been in previous years. When the fungus has gained access to a plantation, all dead canes should immediately be cut out and burned and all frag- ments scrupulously removed from the ground. Spraying is of doubtful value. Mycosphaerellose {Mycosphcerella rubina Stewart and Eustace). — On red raspberry canes in autumn sharply defined brown or bluish black areas from 2-10 cm. long occur on the bark, never on the wood. In the spring these spots bear numerous small pycnidia. This disease, due
. Diseases of economic plants. Plant diseases. 180 DISEASES OF ECONOMIC PLANTS be set where the disease has been in previous years. When the fungus has gained access to a plantation, all dead canes should immediately be cut out and burned and all frag- ments scrupulously removed from the ground. Spraying is of doubtful value. Mycosphaerellose {Mycosphcerella rubina Stewart and Eustace). — On red raspberry canes in autumn sharply defined brown or bluish black areas from 2-10 cm. long occur on the bark, never on the wood. In the spring these spots bear numerous small pycnidia. This disease, due to Sphserella, does not often cause appreciable injury. Yellows.— Plants in this disease are stunted, yellowish, and recall peach yellows.^ Laterals are dwarfed, leaves are small, curled downward at the margins, and yellow mottled. Berries dry up without ripening or are insipid when mature. Health and disease may occur upon the same plant. The cane itself and roots appear normal. The cause and remedy are not yet known. » Stewart, F. C, and Eustace, H. J., (Geneva) .^gr. Exp. Sta. Bui. Fin. 77. — Raspberry dis- colored by After Stewart and Eus- 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 Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York, Macmillan
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