. Diseases of economic plants. Plant diseases. S7nall Fruits 107 brittle. This cane-blight is often erroneously attributed to a borer or to drought, or winter injury. The damage is often as high as 25 or 50 per cent of the crop, and the dis- ease is said to be present to some extent in nearly all of the raspberry planta- tions in New York. Cuthbert, Marl- boro, Ohio, Gregg, Kansas, and the wild red raspberry are susceptible. The Columbian is more resistant. The disease is disseminated largely by infected nursery stock or even by the soil adhering to the roots of diseased plants, and is conveye
. Diseases of economic plants. Plant diseases. S7nall Fruits 107 brittle. This cane-blight is often erroneously attributed to a borer or to drought, or winter injury. The damage is often as high as 25 or 50 per cent of the crop, and the dis- ease is said to be present to some extent in nearly all of the raspberry planta- tions in New York. Cuthbert, Marl- boro, Ohio, Gregg, Kansas, and the wild red raspberry are susceptible. The Columbian is more resistant. The disease is disseminated largely by infected nursery stock or even by the soil adhering to the roots of diseased plants, and is conveyed from plant to plant by wind or rain, by pickers, or by workmen while pruning and layer- ing, also by tools used in cultivation. See soil diseases, p. 26. Since the fun- gus can live on dead fragments of canes, etc., upon the ground, these prove fruitful means of propagating the pest. To prevent the disease, care in the selection of healthy plants is necessary. Plants should not be set where the disease has prevailed in previous years. When the fungus has gained access to a plantation, all dead canes should im- mediately be cut out and burned and all fragments scrupulously removed from the ground. Spraying is of doubt- ful value. Spur-blight ^^^' ^^^ {Mycosphcerella rubina (Pk.) Jacz.). — On black and 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 numer- ous small Fig. 53. — Raspberry discolored by spur- blight. After Stew- art and 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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