BULLETIN 



OF THE 



Ohio Agricultural Experiment Station 



. Number 332 November, 1918 



DESTRUCTIVE INSECTS AFFECTING OHIO SHADE 

 AND FOREST TREES 



J. S. HOUSEE 



INTRODUCTION 



The present publication is intended to supplant Bulletin 194, 

 which appeared more than 10 years ago. Since the time of the pre- 

 vious publication, the investigational work pertaining to the control 

 of insects affecting Ohio shade and forest trees has continued and 

 has resulted in the accumulation of much information upon the sub- 

 ject, applying particularly to Ohio conditions. Moreover, public 

 interest in the welfare of our trees has incerased tremendously 

 during this period, which is evidenced by the serious thought that 

 civic bodies, city administrations and great numbers of individuals 

 are beginning to give to the matter. 



In some measure, at least, this awakening may be attributed 

 to the example set by the people of New England and eastern United 

 States, who are annually spending hundreds of thousands of dollars 

 in the care of their shade trees and who have demonstrated both 

 from the purely financial as well as from the esthetic standpoint 

 that the work is worth while. Nowhere is this brought out more 

 clearly than in residential sections where the trees have been lost 

 through neglect, resulting in tremendous decreases in property 

 values and even in the abandonment of beautiful residences. 



Note: The writer wishes to acknowledge his indebtedness to the following persons who 

 in one way or another have assisted materially in the work attending the issuance of this 

 bulletin. 



Prof. H. A. Gossard has given generous counsel throughout the biological and economic 

 studies which the bulletin embraces and Prof. Edmund Secrest has rendered valuable assist- 

 ance, particularly in those sections of the work which lie quite as much in the field of arbori- 

 culture as they do in entomology, but which it seemed advisable to discuss briefly at this time. 



The cities of Cleveland, Cincinnati, Marietta, Dayton, Canton and Ironton have cooperated 

 geaerously, the first three having afforded facilities and inducements for tlie major portion of 

 the investigational work. To various individuals in these cities the writer wishes to make 

 especial mention. Messrs. M. H. Horvath, G. A. Rettig, John Boddy and H. C. Hyatt, City 

 Foresters of Cleveland; Mr. C. R. Neillie, long in charge of the spraying work of that city; 

 Messrs. William Hodgkinson and C. H. Meeds, Secretaries of the Board of Park Commissioners 

 of Cincinnati and Messrs. J. W. Frye and W. E. Daker, Directors of Public Service of Marietta. 



To Dr. L. O. Howard, Chief of the National Bureau of Entomology the writer wishes to 

 express his appreciation for permission to use Plates XLIV and XLV and to Messrs. A. F. 

 Burgess, L. H. Worthley and D. M. Rogers for courtesies extended from the Gipsy Moth 

 Laboratory at Melrose Highlands, Massachusetts. 



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