104 INSECTS AFFECTING THE RASPBERRY. 



half way out. Then the skin splits open and the 

 moth comes forth. An idea of the general appear- 

 ance of the moth and larva may be obtained from 

 Fig. 46, which represents a closely related insect, the 

 Squash Vine-borer. Canes attacked by these borers 

 often wither and die, and the injury is sometimes at- 

 tributed to ' winter-killing.' 



Remedies. — No other remedy than that of cut- 

 ting out the larvae, or [Hilling up and burning the 

 infested canes has yet been discovered. Fortunatery 

 this insect is rarely sufficiently numerous to do serious 

 injury. It occurs in wild as well as cultivated sorts. 



INJURING THE LEAVES. 



The Raspberry Slug. 



Selandria rubi. 

 The Raspberry Slug, or Raspberry Saw-fly, is 

 a four-winged black fly with a reddish abdomen, 

 which deposits its eggs during spring in the rasp- 

 berry leaf. The eggs soon hatch into small, whitish 

 worms that feed upon the soft tissues of the tender 

 foliage. In a few weeks they become full grown. 

 They are then about three-fourths of an inch long, 

 of a dark green color, and have the body thickly 

 covered with spinose tubercles. The slugs now 

 descend to the ground and construct rather firm 

 cocoons slightly beneath the soil surface. They 

 remain in these cocoons until the following spring, 

 when they come forth as adult flies. 



