350 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



The number of treatments will differ with the locality, the season, 

 and the variety of vine. 



Vines should be protected from late attacks even after the grapes 

 are gathered. 



Young vines should be protected as much as old, even when they 

 are in the nursery. 



The usual methods of applying sulfur by hand or with perforated 

 cans is wasteful and uncertain. 



A good sulfur sprayer is essential for the best results. None of the 

 American dust sprayers tried is suitable for the purpose. The "Ver- 

 morel souf reuse Torpille ' ' was found to answer perfectly. 



The cost of treatment, when a good sulfur distributer is used, va- 

 ries from 50 cents to $2.25 per acre, according to the number of treat- 

 ments necessary. The cost is about equally divided between sulfur 

 and labor. 



Traction machines do not promise any improvement in cost or 

 efficiency. 



Finely divided sublimed or powdered sulfur should be used. 

 Coarse sulfurs cost more because more is needed and they are less 

 effective. 



No other form of summer treatment is so effective as sulfuring, but 

 in rare, special cases a supplementary spray may be useful. 



Winter treatment is in all probability of no use in the control of 

 Oidium. 



