REPORT OF THE SOCIETY 99 



reports that "the experiments have demonstrated in part that rape as a 

 crop could be successfully used in the destruction of perennial sow-thistle, 

 and couch or quack grass." Smothering small patches of weeds with 

 •building or tar paper has been successful, while manure, straw, or old bags 

 have all been found useful. 



In conclusion, it should be remembered that "larger crops mean 

 fewer weeds." Increasing the fertility of the soil means heavier crops, 

 better able to smother out weeds. Pasture left down too long, or over- 

 grazed, becomes weakened, and admits weeds. Certain weeds allow the use 

 of, or require special methods to control them in order to reduce the work. 

 Special implements may be used, correct rotations applied. It should be 

 noted that if weeds are kept from going to seed, and clean seed sown, while 

 "perennial weeds are kept from making top growth," all the principles 

 necessary to control our weeds are employed. "Eternal vigilance is the 

 price of safety." 



References 



1. Adams, J. Medicinal Plants, Bui. 23, 1915, Sec. Ser., Div. Bot., 



Esp. Farms, Ottawa, Can. 



2. Agric. Gazette, Can., Vol. 1, p. 470; 2, 391, 249-253. 



3. Dymond, Archibald and Elford. Grain Screenings. Dept. Agr., 



Ottawa. 



4. Clark and Fletcher. Farm Weeds of Canada, 1909. Seed Branch, 



Ottawa. 



5. Weed Branch, Ottawa; Weeds and Weed Seeds, Bui. S8, 1914. 



6. Seed Commissioner, Seeds Branch, Ottawa, Rpts. 1911, 1913. 



(Ref. 1-6. Publications Branch, Dept. Agric, Ottawa, Canada.) 



7. Commission of Conservation, Ottawa. Ann. Rpts. of Agric. Survey, 



F. C. Nunnick. 



8. Chestnut, V.K. Thirty Poisonous Plants of U.S. Farmer's Bui. 



86, U.S. Dept. Agric, Wash. 



9. Cox, H. R. Eradication of Bindweed. F. B. 368, Dept. Agric, 



Wash. 



10. Cox, H. R. Controlling Canada Thistle. F. B. 545, Dept. Agr., 

 Wash. 



11. Cox, H.R. Weeds: How to Control them. F. B. 660, Dept. Agr., 

 Wash. 



