462 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



canes should always be gone over in spring and those showing 

 any injury examined and removed if affected. 



The Raspberry Cane-borer * 



If the tips of the young shoots of raspberry and blackberry 

 are found withered and dying they have probably been girdled 

 by the cane-borer. The adult beetle is about one-half inch long 

 with a slender, cylindrical body and long antennae, and of a deep 

 black color except the prothorax, which is yellow with two or 

 three black spots, though these are sometimes lacking. 



Life History. -The beetles appear in early summer and the 

 females girdle the young tips by cutting two rings around the 



FIG. 330. The raspberry cane-borer (Oberea bimaculata Oliv.): adult, larva, 

 and larval castings all enlarged. (After Lugger.) 



shoot about an inch apart, causing the tip to wither and droop. 

 Between these rings will be found a small dark spot where- the 

 female has inserted an egg in the cane. A rather large, elliptical, 

 yellow egg is placed in the pith of the cane and in a few days 

 hatches into a small white grub. The larv burrow downward 



* Oberea bimaculata Oliv. Family Cerambycidce. See Comstock and 

 Slingerland, Bulletin 23, Cornell Univ. Agr. Exp. Sta., p. 122. 



