BALTIMORE'S SHADE TREES 



809 



Pruning work is distributed much as 

 the planting work is, except where 

 dangerous or urgent conditions exist. 

 Large numbers of the mature trees are 

 suffering from "stag-headcdness," abra- 

 sions caused by electric wires, etc. 

 These conditions are being improved as 

 rapidly as funds will permit. 2,500 

 trees were pruned during the first winter, 

 and about 500 removed. 



Baltimore is fortunate in being com- 

 paratively free from tlic ravages of 

 dangerous boring insects. Infestations 

 of the leaf eating and several scale 

 insects are common, however. Of the 

 former the tussock moth and the bag 

 worm are most serious. The elm leaf 

 beetle is found only in small numbers 

 and is easily controlled. During the 

 present summer the attacks of the 

 tussock moth were unusually severe and 

 thousands of trees were entirely de- 

 foliated. The silver maple and the 

 American linden suffered most. The 

 North Carolina i^oplar is supposed to 

 be a harbor for the tussock moth, but 

 experience gained during the present 

 Slimmer leads the writer to believe that 

 the species is more nearly immune from 

 the attacks of the leaf eaters than either 

 of the lindens (European and American) 

 or the Oriental Plane. 



The oyster shell and black banded 

 lecanium scales are the commonest of 

 the sucking insects. The former is 

 common on the silver maples and the 

 latter on the planes. Every possible 

 effort is being made with the funds at 

 hand to control the insect situation. 

 The plan of offering a bonus to children 

 for the collection of moth eggs has been 

 inaugurated and should be productive 

 of good results. 



Very little cavity work or tree repair 

 is carried on by the Division. In 

 general it is found that where a tree is 

 sufficiently decadent to require the 

 expenditure of a large sum of money for 

 cavity repair the money is better spent 

 in establishing several young trees. 



A field of service where the Division 

 of Forestry is of especial value to prop- 

 erty owners is in the supervision of tree 



trimming work done by public service 

 corporations. Wherever it is necessary 

 for a company operating overhead 

 wires to prune trees in order to keep 

 their circuits open this work is care- 

 fully directed and supervised by the 



Tree Surgical Work by the Baltimore Forestry 

 Department. 



THIS tree is standing AT THE PLACE WHERE CHARLES 

 CARROLL OF CARROLLTON WAS BORN. THE PROP- 

 ERTY IS NOW OWNED UV THE CITY. 



office of trees. A small source of 

 revenue is realized from this work. 



A shade tree nursery is being devel- 

 oped by the city on a portion of its 

 water shed area at Loch Raven, Aid. 

 7 ,500 desirable street trees of various ages 

 and sizes are now growing in this nursery. 



