SB 

 818 

 C578 

 ENT 



Issued February 19, 1907. 



ijiiited States Department of Agriculture, 



BUREAU OF ENTOMOLOGY, 



L. O. HOWARD. Entomologist and Chief of Bureau. 



THE LOCUST BORER' AND METHODS FOR ITS CONTROL. 



By A. D. Hopkins, 

 In Charge of Forest Insect Investigations. 



The locust borer and its relation to detrimental and destructive inju- 

 ries to the black or yellow locust- in the eastern United States have 

 been subjects of 

 special investiga- 

 tions by the Bureau 

 of Entomology dur- 

 ing the past two 

 years, which have 

 resulted in the de- 

 termination of prac- 

 tical methods of con- 

 trol. 



The locust borer is 

 a whitish, elongate, 

 so-called "round 

 headed " grub or 

 larva (fig. 1), which 

 hatches from an egg 

 (fig. 2) deposited by 

 a black or brown and 

 yellow striped long- 

 horned winged beetle 

 (fig. 3) found on the 

 trees and on the flow- 

 ers of golden-rod 

 from August to Octo- 

 ber. The eggs are 



deposited in the crevices of the bark of living, growing trees from 

 August to October, and the young borers (fig. 2, h, c) hatching there- 

 from excavate individual cells in the outer layers of the inner living 



Fig. 1.— The locust borer [Cyllene robinice) : a, larva, dorsal 

 view; 6, same, lateral view. Line at right represents 

 natural length (author's illustration). The larva in profile 

 should show minute prothoraiic feet. 



1 Cyllene robinice Forst; Order Coleoptera, Family Cerambycidae. 

 - Robinia pseudacncia. 



