THE WHITE-PINE BLISTER RUST 

 Figure "A" shows a young white pine with open blisters and swollen bark. 

 Figure "B" showsaleaf of flowering currant bearine the early currant stage. 

 Figure "C" is a part of the same leaf much magnifted and showing four of the spore masses. 

 Figure "D" shows a black currant leaf bearing the late filamentous stage, this being the stage in 

 which it is transmitted to the pine trees. 



"A," "B" and "D" natural sizo, 



COURTCSr OF BUREAU OF PLANT INDUSTRY. U.S. OEPT. OF AGRICULTURE. BUL. 206. 



