U. S. D. A., B. E. Bui. 58, Parti. F. I. I., June 13, 1906. 



SOME INSECTS INJURIOUS TO FORESTS. 



THE LOCUST BORER. 



(Cyllene rohinix Forst. ) a 



By A. D. Hopkins, 

 In Charge of Forest Insect Investigations. 



OBJECT OF PAPER. 



The object of this paper is to give a summary of the more important 

 published information, supplemented by recently determined new facts 

 relating to the locust borer and methods of controlling it, which will 

 be of service to the investigator in the determination of additional 

 facts, and to the owners of plantations and forests in suggesting 

 methods of preventing losses. 



ECONOMIC IMPORTANCE OF THE INSECT. 



The economic importance of the well-known locust borer as affect- 

 ing the growth of the black locust or yellow locust (Robinia pseuda- 

 cacia) is fully realized by eveiyone who is interested in this valuble 

 forest and shade tree, and the urgent need of additional information 

 on the subject is indicated by the frequent inquiries of correspond- 

 ents and by the recent articles in newspapers, journals, and special 

 publications which have been called forth by the proposed extensive 

 commercial planting of the locust by railroad and other companies and 

 by individuals. 



INVESTIGATIONS. 



In connection with the general study of insects injurious to forest 

 trees, the locust borer has received considerable attention by the writer 

 since 1890. 6 In March, 1905, a plan of cooperation between the 



( < Order Coleoptera, Family Cerambyeidse. 



b From 1890 to 1892 for the West Virginia Experiment Station, and since \W2 tor the 

 U. S. Department of Agriculture. 



1 



