Bui. 957, U. S. Dept. ot Aijriculture 



Plate 



Trunk and Branches of Pinus stkobus, Showing Bark Infections of 

 Blister Rust Eaten by Squirrels. 



riiotofjiaplioil by W. li. s;iu'lL 



Fk;. 1.— An infected branch which \v;i.s eviilontly a youns; iufection that had not vet formed 

 axia. liG. 2.— Infected bark of livinsj (roe. Here mav be seen the blister-bearing central 

 area at the base of the branches in place, while the oiiter, surroundinir, pvcnial zone has 

 been eaten away. Fig. 3.— Infected liark of livinc; tree. The eaten parts were where iivcaia 

 were forming. 



