1100 



Canadian Forestrij Journal, May. 1917 



4. 





1 Warning Re White Pine Disease 1 



I I 



WHITE PINE BLISTER RUST. Photos by \V. A. McCubbin. 



(a) Early stage of white pine blister rust showing typical swelling. 



(b) Branch of white pine completely girdled by disease. 



(c) Appearance of infected white pine during May and June. 



These are days when everyone in 

 or near white pine ought to be scout- 

 ing for white pine bhster. 



The following is taken from Dr. 

 Gussow's excellent pamphlet, written 

 for the Canadian Forestry Associa-' 

 tion. Copies with detailed illustra- 

 tions will be sent upon request. 



"The first and most essential point 

 is to know the disease. If everybody 

 made it his business, when in the 

 woods, every camper, every hunter, 

 every Boy Scout, every lover of our 

 beautiful forests, and, most of all, 

 every forester and wood man, from 

 lumber-jack to owner — to know, re- 

 cognize, and immediately report, 

 where the disease was observed, and, 

 if in doubt he send a specimen to 

 those who know it, then we may hope 

 to cope with it before it is too late. 



The disease is most, of all dangerous 

 to the young pine. When it attacks 

 • the main stem, — and as many as one 

 hundred separate infections and more 

 have been observed on one tree — and 

 girdles "it, which it is sure to do 

 eventually, the tree dies. During 

 May and June each year, this disease 

 can be recognized by any one looking 

 for the following symptoms even if 

 we have no training; later on, only 

 experts can determine it. All know 

 the appearance of the fine smooth 

 dark green bark of stem and branches 

 of this white pine. But does every- 

 body know the white pines from other 

 pines? Of course he knows that the 

 white pines have five needles or leaves 

 in a cluster, while others have but 

 two or three. To make sure of this, 

 he need only cut or pull off a cluster 



