Eradication by Spraying. 159 



solution is about 75 to 100 pounds of iron 

 sulfate to 50 gallons of water; 75 pounds 

 are sufficient if the weeds are young and 

 growing rapidly. From 12 to 15 pounds 

 of copper sulfate, or about one-third of a 

 barrel of common salt, in 50 gallons of 

 water, will make the solution of proper 

 strength for good work when these mate- 

 rials are used. 



The machinery for spraying varies with 

 the acreage on which it is to be used. If 

 only a small area is to be sprayed, as in 

 lawns or the eradication of small patches 

 of some particular weed, any of the ordi- 

 nary knapsack or bucket spray pumps, if 

 fitted with a nozzle which will give a fine, 

 misty spray, will be found satisfactory. If 

 a large acreage is to be sprayed, a power 

 sprayer of the type shown in the frontis- 

 piece is necessary. This machine, or a simi- 

 lar one, can be purchased from dealers in 

 spraying apparatus for from $75 to $150, 

 the cost varying with the size and effective- 

 ness of the machine. It is essential in any 

 case to use a machine with sufiicient power 

 to give a strong, misty spray; a sprinkler 

 will not do. It is desirable in purchasing 

 a sprayer to select one which can be used 



