JUNIPER DISEASES 209 



Cause. 



The yellow wood-rot of the species of juniper found in the 

 Southwest is caused by a fungus named Fomes Earlei. There 

 is but little difference between this fungus and Fames juni- 

 perinus, causing the white pocket heartwood-rot of red juniper 

 in eastern United States. Very few sporophores of Fomes 

 juniperinus have been found, although the rot caused in red 

 juniper is common. Sporophores of Fomes Earlei are common 

 where the trees are affected. It is believed by some that the 

 two species are identical but because very few specimens of 

 Fomes juniperinus are available for comparison, this has not 

 been fully determined. The rots are somewhat different al- 

 though similar in many respects. These differences may be 

 due, however, to the host and do not necessarily indicate that 

 the fungi causing them are different species. Further details 

 concerning the life history and control of wood-rot fungi will 

 be found on page 64. 



, Reference 



Hedgoock, G. G., and Long, W. H. Preliminary notes on three rots 

 of juniper. Myoologia 4 : 109-114, pis. 64^65. 1912. 



Stringy Brown Wood-Rot 



Caused by Fomes lexanus (Murrill) Hedgcock and Long 



This wood-rot affects both the heartwood and sapwood of 

 mountain, Utah and one-seed juniper. The rot is very destruc- 

 tive and common in Texas and New Mexico. 



Symptoms. 



The first signs of the decay are evident as small pockets of 

 light brown tissue in the spring-wood of the annual rings. 

 These pockets soon merge and the spring-wood becomes reddish 

 brown and is partially or entirely destroyed. This action leaves 

 concentric zones of badly rotted and apparently sound wood 



