900 



Canadian Forestrij Journal, January, 1917 



CANADA'S WHITE PINE POSSESSIONS 



ARE THREATENED WITH 



EXTERMINATION 



An Authoritative Discussion of White Pine Blister Rust 



Written by H. T. Gussow, Dominion Botanist, Ottawa. 



The Forest resources of the 

 Dominion of Canada, it has been said, 

 are inexhaustible. This statement, 

 on careful inquiry, may need some 

 modification. The forest wealth of 

 Canada undoubtedly is inexhaustible 

 as far as the present generation is 

 concerned it will be found ample yet 

 for many more generations. We must 

 however, bear in mind the wonderful 



opportunities Canada offers for settle- 

 ment. With an increased popula- 

 tion such as Canada requires to de- 

 velop its natural resources to the 

 fullest degree the demands on the 

 Dominion forest resources will in- 

 crease simultaneously, very probably 

 in an increasing ratio. 



We are, as a nation, so convinced 

 of this great forest wealth that little 



Photos by W. A. McCubhin 



(a) 

 (b) 

 (c) 



White Pine Blister Rust 

 Early stage of white pine blister rust showing typical swelling. 

 Branch of white pine completely girdled by disease. 

 Appearance of infected white pine during May and June. 



