i6o Weeds. 



for other purposes if possible, such as the 

 spraying of potatoes or orchard and truck 

 crops. 



The cost of spraying varies according to 

 the material used, the machinery with which 

 it is applied, and th|ej:ime necessary to apply 

 it. The material, whether it be iron sul- 

 phate, copper sulphate, or common salt, 

 should not cost more than $1.25 an acre, 

 and may run as low as 75 cents, according 

 to the cost in the local market, the material, 

 and the quantity used. Salt is probably the 

 cheapest of the three, and should not cost 

 more than 75 cents. A field sprayer like 

 that illustrated should spray from 25 to 40 

 acres in a day. In addition to the driver 

 and horse or team necessary for this outfit, 

 another man and team to haul water will 

 be needed for rapid work unless the spray- 

 ing is done close to the water supply. 



The weeds of tliis family for which spe- 

 cial descriptions are given are the ones 

 which are most commonly found trouble- 

 some. They are the zvild mustard, false 

 ■Rax, French zvecd or pemiycress/and tum- 

 bling mustard. The methods of eradication 

 outlined in the foregoing pages will be 

 found effective in combating these and sim- 



