40 



EXPERIMENT STATION BULLETIN. 



Disease Control. Bordeaux gave almost complete control of anthrac- 

 nose on all varieties. Early in the summer when the new growth was 

 developing rapidly there were times when the new leaves were not cov- 

 red with spraying material. At such times anthracnose developed 

 slightly on the terminal growth but was checked as soon as the next 

 application was made. 



The results with lime-sulphur and sulphur dust were similar. On re- 

 sistant varieties there was little development of anthracnose but con- 

 trol was not so complete as with bordeaux. On the more susceptible 

 varieties anthracnose caused considerable defoliation. The amount of 

 injury varied with the resistance of the variety. Bed Dutch plants in 

 the sulphur plots were nearly defoliated by August 15. This was caused 

 partly by sulphur injury and partly by anthracnose. 



Results with Arsenicals. There was no foliage injury which was 

 traceable to either lead ar senate, calcium ar senate or magnesium ar se- 

 nate. There was foliage injury in all these plots but it was caused by 

 lime-sulphur and developed some time after the last spray of arsenicals 

 had been applied. 



FIG. 15. PRINCE ALBERT CURRANT. A typical plant from the check plot. Very resistant 

 to anthracnose. Photo. Sept. 10, 1919. 



