358 



Diseases of Economic Plant 



Red heart-rot, Pecky heart-rot ^^^ {Trametes pini Fr.) . — 

 In the North this is the most destructive tree rot affecting 

 practically all conifers, invading the heartwood, veiy rarely 

 the sapwood. The wood is not wholly destroyed by the 



Fig. 187. — Wound of jjroperly removed limb nicely healed 

 over. After Ind. Agr. Exp. Sta. 



fungus; but series of small holes with silvery lining are noted 

 in early stages. In spruce the color of the wood itself is 

 changed to a light purplish gray, later to a reddish brown 

 netted with small black lines. Small patches of white follow, 

 which later develop into holes, arranged in series to corre- 



