16 



Eradication. Hand pull and burn when in small quantities. If the 

 field is badly infested the following method of eradication is recommended. 

 *"Run a disk or harrow over the stubble as soon as the crop is removed,, 

 so as to start into growth the seeds near the surface. The following- 

 spring- cultivate or harrow these plants down ; and as soon as growth of 

 fresh plants starts, plow the land and harrow at once. This land may be 

 sown late to a green feed crop or it may be kept under a clean fallow for 

 the whole season if the land can be spared. The following spring any 

 growth of weeds should be cultivated down before sowing the crop." 



Plants with fully formed pods should never be plowed down, as the 

 seeds will mature below the ground and maintain their vitality for consid- 

 erable time. 



Russian Thistle. 



(Salsola Kali, var. tragus, Moq.) 



This is a new weed which has appeared on many farms in Ontario 

 during the past season. It has been introduced as an impurity in Alfalfa 

 seed. A large percentage of the samples of Alfalfa seed examined at the 

 Department of Botany this spring contained the seeds of this weed 

 and already this fall several specimens of the weed, found in Alfalfa 



Fig. 15. Russian Thistle. {Salsola Kali var. Tragus.) 



'Farm Weeds of Canada, by Goo. H. Clark and Dr. James Fletcher. 



