FORESTER WHOSE FIELD IS THE CITY 



essential. Scientific pruning" calls for 

 an intimate knowledge of the structure 

 and life of a tree. The city forester not 

 only supervises the city employees who 

 prune trees, but regulates all pruning 

 done by private persons. 



Fighting the insects means knowing 

 forest entomology and the use of in- 

 secticides, as well as practical experi- 

 ence with the best methods and ap- 

 paratus. City trees have a vast number 

 of insect enemies, and these cannot be 

 exterminated merely by sprinkling the 

 trees with chemical solutions. The city 

 forester has to contend with epidemics 

 of insects that cause wholesale destruc- 

 tion. The need and value of expert 

 work has been shown by success with 

 such epidemics in Brooklyn. Among 

 other things, it was brought to light 

 that a certain lead arsenate, extensively 

 used in manv eastern cities, was inef- 



fective. A better one was found f( 

 exterminating leaf-eating insects. 



Tree diseases have to be mastere 

 and this involves a knowledge of fun: 

 and of their life-history. Again, cav 

 ties and wounds require special trea 

 ments. by means of which a foresti 

 may save considerable expense. A 

 tacks of the hickory-bark beetle, tl 

 sycamore blight, the chestnut disea: 

 may become epidemic. Detecting the 

 and suppressing them as promptly ; 

 possible requires constant close attei 

 tion and the application, sometimes. < 

 heroic methods. A very important fie' 

 for scientific experiment is offered 

 connection with this work. 



REMOVING TKKKS 



Besides planting and tending tree 

 the city forester has to remove thei 



Removing Egg Masses of the Tussock Moth Caterpillar in Brooklyn, New York 



