BASPBERRY, BLACKBERRY AND DEWBERRY INSECTS 325 



No satisfactory method of controlling negro bugs on berries 

 has yet been devised. 



The Tree-cricket 

 (Ecanthus nigricornis Walker 



Several species of tree-crickets occur abundantly in the 

 eastern United States and Canada. These delicate, greenish- 



FiG. 279. 



Tree-cricket egg-scars in raspberry canes, one cane split open to 

 show the eggs. 



white, long-horned crickets become mature in late summer 

 and the females deposit their eggs in punctures in the tissue of 

 various plants. Injury to blackberry and raspberry canes is 

 caused principally by the female of nigricornis. The eggs of 

 this species are about | inch in length, cyUndrical, sUghtly 

 curved and chrome yellow in color, with the egg-cap cream- 



