BULLETIN 



OF THK 



Ohio Agricultural Experiment Station 



NUMBER 194. JUNE, 1908. 



THE MORE IMPORTANT INSECTS AFFECTING 

 OHIO SHADE TREES. 



BY J. S. HOUSER. 

 INTRODUCTION. 



With the rapid decrease in the forest acreage of the country we 

 are learning- to appreciate trees, both for their beauty and for their 

 value as an econoitiic factor in our welfare; hence, the problem of 

 their preservation is coming to mean more and more to us. Gener- 

 ally speaking, this decrease in the number of trees has been accom- 

 panied by an increase of the insect foes that prey upon them, both 

 as regards numbers of species and individuals of a given species. 

 Further, this band of depredators seems to be getting in its work 

 more effectively in the city districts than in those more rurally sit- 

 uated. This publication, therefore, from the very nature of things, 

 will be of greatest value to the city householder, but may be applied 

 to the needs of all. 



INSECT CONTROL A NECESSITY IN CITIES. 



For several reasons the employment of artificial measures 

 against shade tree insects is more nearly a necessity under conditions 

 that exist in the cities and towns than under those found in the 

 rural districts. 



The absence of many of the insectivorous birds 



insect-eating birds, partially explains the abundance of insect life 



in the cities. Since the advent of the English 



sparrow a bird which is not a pronounced insect eater many of 

 the birds that previously nested in the cities have been driven to 

 more remote districts. 



(169) 



