FORESTER WHOSE FIELD IS THE CITY 



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essential. Scientific pruning calls for 

 an intimate knowledge of the structure 

 and life of a tree. The city forester not 

 only supervises the citv 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 man\- eastern cities, was inef- 



fective. A better one was found for 

 exterminating leaf-eating insects. 



Tree diseases have to be mastered, 

 and this involves a knowledge of fungi 

 and of their life-history. Again, cavi- 

 ties and wounds recjuire special treat- 

 ments, by means of which a forester 

 may save considerable expense. At- 

 tacks of the hickory-bark beetle, the 

 sycamore blight, the chestnut disease 

 may become epidemic. Detecting them 

 and suppressing them as promptly as 

 possible requires constant close atten- 

 tion and the application, sometimes, of 

 heroic methods. A very important field 

 for scientific experiment is offered in 

 connection with this work. 



REMOVING TREES 



Besides planting and tending trees. 

 the citv forester has to remove them. 



Removing Egg \5asses of the Tussock Molb Caterpillar in Brooklyn, New York 



