468 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



full-grown larva is five-eighths to three-quarters inch long, with 

 a small brown head, a much-expanded prothorax which looks 

 like the head, and a slender, cylindrical, white body, surmounted 

 by two slender brown horns at the tip of the abdomen. 



This cane-borer is a native pest, very common in wild raspberries 

 and blackberries, and occurs generally throughout the country. 



Control. Obviously it may be readily controlled by cutting off 

 the infested canes below the galls and burning them. This should 

 be done any time before May. Where wild canes are infested 

 near those cultivated they should be included in the pruning. 



The Blackberry Gall-maker * 



The so-called " pithy gall " of the blackberry is an elongated. 



FIG. 337. The pithy-gall of the blackberry: a, gall; b, section of same showing 



larvae in cells; c, larva enlarged and natural size; d, pupa. (After Riley.) 



* Diastrophus turgidus Bass. Family Cynipidee. 



