. Diseases of economic plants. Plant diseases. Small Fruits 111 irregular, reddish brown spots with pycnidia are more rarely produced. Plants, after several years of disease, die, as do cuttings during the first or second year. Thrifty plants are much more resistant than weak ones. Particular attention should, therefore, be given to provide such irrigation as to best favor the health and vigor of the plants. Sanding the fields often gives good results, doubtless due partly to removal of con- tagion by covering infective material. It is also advisable,. Fig. 55. — Cranberry scald and blast. Aft
. Diseases of economic plants. Plant diseases. Small Fruits 111 irregular, reddish brown spots with pycnidia are more rarely produced. Plants, after several years of disease, die, as do cuttings during the first or second year. Thrifty plants are much more resistant than weak ones. Particular attention should, therefore, be given to provide such irrigation as to best favor the health and vigor of the plants. Sanding the fields often gives good results, doubtless due partly to removal of con- tagion by covering infective material. It is also advisable,. Fig. 55. — Cranberry scald and blast. After Shear. for the same end, to rake out and burn all dead and infected plants in the autumn. Cuttings should be taken from such plants as show resistance to the disease. In spraying experiments by Shear, five applications of 6-6-50 Bordeaux mixture, with 4 pounds of rosin-fish-oil- soap added to increase adhering power, showed per cent of rotten berries, while the unsprayed plats showed per cent of rotten berries. The cost of application was $15 to 120 per acre, using 200 gallons of mixture at each application. Rot (Acanthorhynchus vacdnii Sh.).—An effect upon the berry very similar to that of the scald fungus appears. 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
Size: 2069px × 1208px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921
