\VKKDS 



100 pounds of iron sulphate and 12 pounds of bluestone 

 are dissolved in 50 gallons of water. The liquid is then 

 applied thoroughly to the weeds by a field sprayer. 



Common salt, gasolene, or carbolic acid may be applied 

 by hand to scattering perennials. A little on the root of 



each plant after the top has been 

 grubbed off is usually enough. 

 This remedy, however, makes 

 the soil less fertile for a year or 

 two in the spots where it has 

 been applied. 



Summer fallowing means the 

 cultivation of a field without a 

 crop. The land must be kept 

 bare by frequent and thorough 

 cultivation. Then the under- 

 ground parts of a plant are 

 starved out because they are not 

 allowed to send up stems and 

 leaves to make starch. 



Sometimes buckwheat is sown 

 to smother perennials that are 

 not easily subdued by other 

 methods. Buckwheat itself has 

 some weed characters. It resists 

 drought, grows rapidly, thrives 

 on poor soil, and tolerates 

 shade. 



Two particularly troublesome 

 weeds we will discuss in detail. 



216. The Canada Thistle may be regarded as the " Prince 

 of Weeds." It came originally from Europe, where it is 

 called "Creeping Thistle." It is a perennial, and each 

 plant develops vigorous rootstocks from which there grow 



MOTH MULLEIN. 



