406 



FRUIT INSECTS 



When the grubs have fed sufficiently they drop from the 

 grape leaves, and after working their way from one half an inch 

 to two inches into the ground, they twist and roll themselves 

 about until a smooth cavity is formed in which a few days later 

 the larva transforms to a saffron-yellow pupa (Fig. 352). The 

 pupal stage lasts from a week to twelve days. The beetles 



Fig. 351. — Grubs feeding on a grape leaf. 



emerge from the ground during th(^ latter part of July and after 

 feeding for several w(»eks on the foliage of the grape and other 

 plants go into hibernation in the early fall under fallen leaves 

 and other rubbish, especially in waste fields and near-by wood- 

 lots. 



The grape-vine fic^a-beetk^ can b(^ most easily controlled by 

 spraying the vines with an arsenical poison between the middle 



