THE MONTHLY BULLETIN. 



I'?.". 



Already the white pine forests of the East are in jeopardy. If the blister rust is 

 allowed to gain a permanent foothold in those forests, the future of the white pine 

 and with it the industries dependent upon it are doomed, at a loss of hundreds of 

 millions of dollars. The time when this effect will be seriously felt is not far off. 

 Granted that there is at hand a large stock of merchantable timber, in the natural 

 course of things this stock will be cut out within the next decade and the younger 

 age classes move up into the mature class of trees ready for tin- axe. But if the 

 younger trees are killed off by the blister rust there will be no timber in the future 

 large enough to be utilized. If the present fight against the fungus is not successful, 

 the first economic effect will be felt within twenty to thirty years. The situation is 



id qlisteoinq drops 



Of) pine I'drr, 



orange-Yellow 

 blisters on 

 pine bar* 



fungus >^ 

 Threads 

 wbicn sprout 

 from The spores 

 in the columns 



*f/ oranrje-iellow 

 s£s pustules 00 the 

 under side erf 

 currant and dOU-uberrY 

 leaves 



In 

 hair-lifce columns 

 on the under side ui 

 currant and quoseberrY leaves 



<?•* 



Life cycle of Cronartium ribicola. 

 1. 



No. 



No. 



X... ::. 

 No. 4. 

 Nn. 5. 



Pycnospore. 

 Aeciospore. 

 Urediniospoi 



Teliospore. 

 Spin idiom. 



(U. S. Department of Agri< ulture. i 



alarming now; it will be critical or hopeless then, as ii is in Europe, with this 



difference that tin- values at stake in this country are ii asurably greater than 



those abroad. 



Tie' white pine forests of the East are not the only asset.s in danger from the 

 blister nisi. The monetary values stored in sugar pine and western white pine in 

 the West amount to hundreds of millions of dollars, while the role both trees play 

 in the beanty and grandeur of the forests of the Weal can not be expressed in dollars 

 and cents. So far the disease is unknown in the home of either sugar pine or 

 western white pine; but both trees in cultivation abroad have contrai ted the disease 



