FUNGI CAUSING RED OR WHITE ROT. 439 



b. Subjects of Attach. 



This disease is commonest near villages and towns where 

 forests are much exposed to mischief, and also in forests 

 liable to wind- or snow-break. 



Trametes Pini is prevalent on trees from forty years old and 

 upwards, as it does not generally attack sapwood owing to its 

 turpentine, and because wounds in young trees are usually 

 soon closed with resin. It attacks the larch, spruce, and 

 silver-fir, as well as the Scots pine. In the silver-fir, decay 

 spreads to the youngest woody zones which contain little 

 turpentine. 



The sporocarps may become very old, up to sixty years, and 

 attain large dimensions. The technical value of the wood is 

 greatly impaired by the disease. The fungus is common in 

 the Scots pine forests of North Germany, and in the Harz and 

 Thiiringer-Wald and South Germany, chiefly on the spruce. 

 In the Carpathians it attacks silver-fir and larch woods. It 

 occurs in the British Isles. 



c. Protective Rules. 



i. Mix broadleaved trees with conifers. 



ii. Pruning living branches of Scots pines which already 

 contain heartwood must be abandoned. Living branches may 

 be pruned up to thirty years of age, as they contain no heart- 

 wood, and the infection is less liable to occur in young wood. 

 In any case prunings should be clean cut with a saw, and, in 

 silver-fir, at once tarred over. 



iii. All infected trees should be removed during thinnings. 

 In this way the sporocarps may be destroyed and the spread 

 of spores hindered ; also wood of diseased trees may be utilised 

 before the decay has gone too far, as it is at first frequently 

 confined to the upper part of a tree. 



Wherever rot is due to wound-fungi, it may be avoided 

 by attention to the rules given for Trametes Pini, Fr. 



Notes regarding Fungi causing Red or WJdte Rot. 



A short account will here be given of certain fungi belonging 

 to the order Basidionujcetes, family, Pohjporeae, which assist 



