238 Bush-Fruits 



the wilting or dying tips which show its presence 4 are the only prac- 

 ticable methods of control known. 

 References. 



N. J. Expt. Sta. Spec. Bull. N. (1891). 



Wash. Expt. Sta. Bull. 63. 



THE RASPBERRY CANE-MAGGOT 



Phorbia rubivora, Coquillett 



This is the larva of a true fly, grayish black in color, closely re- 

 sembling the common house-fly, though not quite as large. The 

 larva is a slender, white, footless maggot, found burrowing in the 

 tips of raspberry canes. It is closely related to the radish and onion 

 maggot. The eggs are laid early in spring, very soon after the young 

 canes start, in the fork at the base of the tip leaves. The young larva 

 burrows into the cane near the point of hatching, works its way down- 

 ward in the pith a short distance, then proceeds to girdle the cane 

 inside the bark. The part above the girdle soon wilts, turns to a 

 dark blue color and dies. The effect is usually to kill the entire shoot 

 also. The larva continues to bore downward in the dead or dying 

 cane, transforms to a pupa near the base, and there remains until 

 the following spring, when it emerges as the adult fly. 



Although often a serious pest, the insect may readily be over- 

 come. If the wilting tips are gathered and burned as soon as no- 

 ticed, which will usually be during May, the work of those larvae 

 will be forever ended. 

 References. 



Cornell Univ. Expt. Sta. Bull. 126:54. 



Wash. Expt. Sta. Bull. 62. 



THE AMERICAN RASPBERRY BEETLE (FIG. 28) 



Byturus unicolor, Say 



This insect is doubly troublesome, because injurious, or at least 

 annoying, both in the perfect and in the larval state. The mature 

 insect is a small beetle about three-twentieths of an inch long, of a 

 yellowish brown or pale reddish color, and densely covered with 

 fine, pale yellow hairs. In this form it is injurious to raspberries and 



