CURRANT AND GOOSEBERRY INSECTS 341 



thin layer of bark. It then transforms to a pupa (Fig. 299) in 

 a silken-Hned cavity at the end of the burrow. When ready 

 to transform the pupa pushes itself part way out of the opening 

 and the moth leaves the empty pupal skin projecting from the 

 cavity. There is only one brood a year. •. 



The infested canes do not die in the fall but are usually able 

 to put out a sickly foliage the following spring. Such canes 

 should be cut off and destroyed before June 1 to prevent the 

 emergence of the moths. 



References 



Col. Agr. Exp. Sta. Bull. 19, pp. 21-22. 1892. 



Vt. Agr. Exp. Sta. Kept, for 1894, pp. 130-132. 1895. 



Wash. Agr. Exp. Sta. Bull. 36, p. 14. 1898. 



The Imported Currant Worm 



Pteronus ribesii Scopoli 



Introduced into this country from Europe about 1857, this 

 insect now occurs wherever currants or gooseberries are growTi 

 in the northeastern states and Canada, and is the commonest 

 and best known of gar- 

 den pests. 



The adult sawflies 

 (Fig. 301) appear as 

 soon as the leaves put 

 forth in the spring; 

 the female is about 

 one third inch in length 

 with the head and 

 thorax more or less 

 black when viewed from 

 above and has the ab- 

 domen dull yellowish ; t:. om a ^ i^ r xu • ^ j 



•^ ^ Fig. 301. — Adults of the imported currant 



the male is smaller, worm (x 2). 



