320 



Slate Iforiicnllaral Society. 



in severe cases, preventive measures are the easiest and most effectnal. 

 Remove and burn all dead branches and diseased or dead trees. In this 

 way the infectious sources of both fungi and insects are destroyed. 



Sunscalds are quite frequent among street shade trees, because they 

 are not close enough to shade their trunks. In ordr to prevent it, the 

 trees may be wrapped with burlap or with rye straw. When trees are 

 injured by sunscalds the loose bark should be cut away down to the live 

 growth and the exposed wood painted over. 



Sleet storms and winds frequently break down trees which have not 

 been properly trimmed. The Silver Maple suffers damage from this 

 source. If no large crotches are allowed to form in the trees they will 



FiR. 5. Protection for street trees. 



not be liable to injur}-. The uKthod oi pnuiing, show n in higinx's _' and 3, 

 cannot be recommended. Such trees had best be cut down, they are only 

 valuable for cord-wood. 



A m'oment'g ponsideration of the structure of a tree, as briefly out- 



