1908.] PUBLIC DOCUMENT — No. 33. 135 



are unfavorable to the growth of the fungus. Wheeler, Hart- 

 well, Sargent and Towar, 1 who have investigated this subject, 

 have shown that acid soils restrict, while lime, ashes, etc., 

 increase, the amount of scab. Dr. Wheeler points out that 

 sulfate of potash, kainit and muriate of potash, in connection 

 with dissolved phosphates, etc., will benefit the soil and render 

 infection less prevalent. 



i Cf. various articles by H. J. Wheeler, J. I). Towar, B. I,. Hartwell and C. L. Sargent, 

 in Bulletin No. 26, 1WJ3, No. 33, 1SU5, and No. 40, 1S9G, Rhode Island Experiment Station. 



