A99.9F764L' 



Agriculture 



Forest Service 



Intermountain 

 Forest and Range 

 Experiment Station 

 Ogden, UT 84401 



Research Paper 

 INT-298 



March 1983 



i4s 



Histological 

 Differentiation 

 Among Abiotic 

 Causes of Conifer 

 Needle Necrosis 



Clinton E. Carlson 

 Carma J. Gilligan 



