336 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



essarily large quantity in order to cover the whole vine. This is espe- 

 cially true in the case of high vines. The machines worked fairly well 

 only when the outlet tube was held in a downward direction. While 

 treating the tops of high vines the sulfur accumulates in the tube, 

 which finally chokes up. In order to clear the tube it is necessary to 

 hold it down, upon which the accumulated sulfur runs out and is 

 wasted on the ground. 



The European machine, on the contrary, gave most excellent results. 

 (See fig. 9, a.) The regulation device enables the operator to govern 

 the amount of sulfur blown out with great precision. This is a very 



Fig. 10. Sulfur cloud to cover the whole vine. 



important point, as it makes it possible to use various grades of sulfur 

 effectively and economically. The reservoir of the machine holds 

 enough sulfur to treat two or three acres without refilling, but is less 

 fatiguing to carry than the other machines, which hold only one- 

 quarter as much. The sulfur is blown out in a fine impalpable powder 

 (see figs. 10, 11, and 12), and owing to the form of the machine it can 

 be applied to any part of the vine. By standing a little distance from 

 the vine a single puff can be made to distribute the sulfur over the 

 whole exterior of the vine. (See fig. 10.) Then after poking the end 



