MASSACHUSETTS 



AGRICULTURAL EXPERIMENT STATION 



Bulletin No. 222 March, 1925 



EXPERIMENTS ON THE CONTROL OF APPLE SCAB AND BLACK 

 ROT AND SPRAY INJURY IN 1924 



By W. L. DoRAN 



This bulletin reports the results obtained, during the past season, in the 

 study of the control of apple scab and black-rot. Incident to the 

 main problems there have been comparisons of spraying and dust- 

 ing, and observations on many related subjects. The difficulty 

 which led to such widespread injury from apple scab, previous 

 to the initiation of this work in 1921, was in the spray calendar, 

 particularly with reference to the prepink and pink sprays 

 or dusts. Greater care in these apphcations seems to be 

 absolutely essential in any thoroughgoing attempt to 

 control this destructive disease. 



Requests for Bulletins should be addressed to — 

 AGRICULTURAL EXPERIMENT STATION 

 AMHERST, MASS. 



