LARCH DISEASES 217 



concerning the general life history and control of the wood- 

 rotting fungi, see page 64. 



Reference 



Meineoke, E. P. Forest tree diseases coininon in California and 

 Nevada. U. S. Dept. Agr. Forest Service. Unnumbered pub- 

 lication, pp. 1-67, pis. 1-24. 1914. 



Brown Pocket Heartwood-Rot 



Caused by Fames roseus Fries 



This heartwood-rot is common in larch as well as in fir, spruce, 

 pine and hemlock, in almost .every section of the country where 

 these trees grow. The rot may be confused at times with the 

 red-brown root- and butt-rot caused by Polyporus Schweinitzii 

 (see page 294). The decayed wood is brown, easily powdered 

 and looks like charcoal. At first long cylindrical or pointed 

 pockets of decayed wood are formed. Later these pockets 

 may join and large areas of the heartwood are uniformly brown 

 rotted. The fruiting-bodies of the causal fungus are produced 

 at branch stubs on affected trees or on the sides of fallen timber. 

 They may be either small and thin structures or large hoof- 

 shaped bodies. The under surface is rose-colored. For further 

 details concerning this heartwood-rot, see under juniper diseases, 

 page 204. 



Red-Brown Root- and Butt-Rot 



Caused by Polyporus Schweinitzii Fries 



Fir, pine, spruce, hemlock and arbor-vitse in addition to 

 the larch are affected by this wood-rot wherever these kinds of 

 trees grow. It is next in importance to the pecky wood-rot 

 of these trees. The affected heartwood of the roots and lower 

 part of the trunk is at first yellowish and cheesy but later be- 

 comes red-brown and brittle. This wood-rot is more fully 

 described under pine diseases, page 294. 



