2 FAKMEKS BULLETIN 742. 



disease was introduced into the States of New Hampshire, Vermont, 

 Massachusetts, Connecticut, New York, Pennsylvania, New Jersey, 

 Ohio, and Indiana. The disease is now known to be present in tlie 

 States of New Hampshire, Vermont, Massachusetts, Connecticut, 

 New York, and Pennsylvania. Owners of planted 5-needle pines in 

 all States should watch for indications of this serious disease. 



FIG. 1. White-pine tree about 10 years old dying from the effects of 

 the blister rust. The measure indicates the height of the tree in 

 feet. Just above the 1-foot level is a girdle of dead, cracked bark. 

 Directly above the dead bark are numerous white blisters on the 

 edges of the living bark. The tree is badly stunted in growth. 

 (Photograph furnished by G. C. Atwood.) 



FIG. 2. Trunk of a white-pine 

 tree about 10 years old which 

 has borne blisters of the 

 blister-rust fungus in pre- 

 vious years. Note the heavy 

 scales of dead bark on a tree 

 which at this age ought to 

 have smooth bark. (Slightly 

 less than life size.) 



WHAT TO DO ABOUT WHITE-PINE BLISTER RUST. 



WHAT TO DO ABOUT WHITE PINES ALREADY PLANTED. 



The white-pine blister rust 1 came into this country from Europe 

 in nursery stock and in no other way. Any white pines, stone 



1 The disease commonly known as white-pine blister rust is caused by a fungous parasite known tech- 

 nically as Cronartium riUcola Fischer (.Peridermium strobi Klebahn). 



