162 



Lessons in Fruit Growing. 



spotted with black, changing to green again before pupat- 

 ing (Fig. 47). Two or more broods appear each season. 

 Treatment. Spraying the affected leaves with water 

 containing powdered white hellebore, at the rate of an 



''^aa--,^ 



Fig. 47. Currant foliage attacked by imported currant worm. (After Saunders.) 



ounce to three gallons, effectually destroys the currant 

 worm without poisoning the fruit. The spraying should 

 be repeated as often as the larvae appear. An arsenite may 

 be substituted for the first spraying if this is made immedi- 

 ately after the setting of the fruit. 



239. The imported currant borer {Sesia tipuUformis) 

 burrows in the pith of the red and white currants. The 

 eggs are laid in the spring, usually near the buds, and the 

 larvae eat their way to the pith, burrowing up or down the 

 stem, until June of the following year. 



Treatment. Spraying the stems liberally, just as the 

 leaves are expanding, with water containing Paris green 

 will destroy many of the larvge. Infested stems are easily 

 detected in spring by their pale-colored foliage, which ex- 



