OIDIUM OR POWDERY MILDEW OF THE VINE. 337 



of the tube into the center of the vine another puff will thoroughly 

 sulfur the interior. (See fig. 11.) By a small attachment placed on 

 the end of the tube the cloud may be forced upwards and the under 

 side of the leaves more thoroughly treated (see fig. 12), but this is 

 seldom necessary. The work is much less laborious than with any of 

 the other methods tried and the workman is less liable to be troubled 

 by the sulfur getting into his eyes. 



Fig. 11. Sulfuring interior of the vine. 



Fig. 12. Sulfuring the under side of leaves. 



A machine made in San Francisco on the plan of the European 

 machines was found excellent in all respects except that it lacked the 

 regulating device. 



The following table shows some of the results obtained with the 

 various methods of sulfuring : 



