42 DISEASES OF ECONOMIC PLANTS 



should be provided with a good agitator to keep the spray- 

 ing mixture stirred while in use. The pump should be 

 fitted to carry two leads of hose. Without hose or nozzle 

 the cost will be from $13 to $16. 



Fig. 12. — Barrel pump showing agitator. After Gould Mfg. Co. 



Tank sprayers. — These differ from the barrel pumps 

 mainly in their larger capacity and mode of obtaining 

 pressure. They cost about $25. 



Field sprayers. — This sort of sprayer is used in spray- 

 ing low plants, such as strawberries, potatoes, tomatoes, 

 cabbage, etc. Several nozzles are attached, so that from 



