194 TREE WOUNDS AND DISEASES 



and careful pruning will lessen the evil. 

 Several fungi attack the lime, such as Nectria 

 cinnabarina and N. ditissima. 



Maple This is a hardy, small-growing tree 



that is fairly exempt from injury either by 

 storms or insect and fungoid attacks. The 

 leaves are occasionally rendered unsightly by 

 the presence of numerous black spots due to 

 attacks of the fungus Rhytisma acerinum. Col- 

 lecting and burning the diseased leaves is to be 

 recommended as keeping this pest in check. 

 Another fungus, Nectria cinnabarina^ attacks the 

 maple, but it is comparatively harmless. 



Mulberry. Few trees require more atten- 

 tion in the matter of pruning and staying 

 than the mulberry. Inclined to send out 

 heavy and often unwieldy limbs, the wood of 

 which is brittle and liable to insect attack, 

 early attention to pruning or foreshortening 

 and staying, where necessary, should be given. 

 Many large and historic mulberry trees are 

 found in and around London, which should be 

 carefully guarded against injury and disease. 

 Being a long-lived tree, it well repays attention. 



Oak. The oak suffers severely from storms 



