SMALL FRUITS 147 



designated as the " blast," while still another form of it 

 has been termed the " scald." 



The scald may appear upon the berries, causing small, 

 light-colored, softened, watery spots. These rapidly in- 

 crease in circumference, and even envelop the whole fruit. 

 Sometimes the diseased portion shows more or less distinct 

 brownish zones. In other cases the zones are lacking, 

 and the whole fruit becomes very soft and of light, watery 

 color. 



Upon the leaves irregular reddish brown spots with 

 pycnidia are more rarely produced. 



Plants after several years of disease die, as do also cut- 

 tings during the first or second year after planting. 

 Thrifty plants resist the disease much more than weak 

 plants. 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 partly removing contagion by covering 

 infective material. It is also advisable for the same end to 

 rake out and burn all dead and infected plants in the au- 

 tumn. 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 resin-fish oil 

 soap added to increase adhering power, showed 2.36 per 

 cent of rotten berries, while the unsprayed plats showed 

 92.6 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 Vaccinii Shear). — An ef- 



^ Shear, C. L., U.S. Dept. Agr. Bur. Plant Indus. Bui. 110. 



