Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 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 a
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 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 $20 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
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