34 FOREST TREE DISEASES. 



appears exceedingly thin. Most of the needles have 

 dropped off, and the few that remain are either dying 

 or dead. The only green needles stand in a meager 

 tuft at the end of the twig. The damage is due to the 

 attack of a needle fungus (a species of Ilypoderma), 

 the leaves showing broad, transverse zones of light gray 

 or yellowish brown, sometimes alternating with zones 

 of green. The fruiting bodies appear on both sides of 

 the middle nerve in the shape of short, narrow, black 

 lines. The disease seems to be quite serious in some 

 localities and is likely to do great damage where it 

 results in almost complete defoliation of the tree. 



NEEDLE DISEASE OF YELLOW PINE. 



The needles of yellow pine, which normally remain 

 on the twigs from 3 to 7 } ears, are often killed down to 

 the last one or two years by a fungus (probably a 

 species of Lophodermium) , and either drop off, with 

 the result that the foliage appears very thin, or else 

 remain hanging on the branches for many years, giv- 

 ing the tree a " whiskered " appearance. From green 

 they turn to yellow and later to silvery gray. The 

 increment of the tree is very seriously affected by this 

 disease, which does- considerable damage. The fruiting 

 bodies of the fungus appear in the shape of very small, 

 black, irregular spots or short lines. 



STUNTING NEEDLE FUNGUS OF YELLOW AND JEFFREY 

 PINES. 



A very destructive needle fungus (Hypoderma) at- 

 tacks both yellow and Jeffrey pine, often killing all 



