HEMIPTERA 



145 



but about the best remedy is to destroy the infested tree or vine, and plant 

 one of another species which is not a host-plant for the pest. 



Fig. 114. PhyllSxe'ra vastd'trix: a, Leaf with galls; b, section of gall 

 showing mother louse at center with young clustered about; c, egg; d, 

 larva; e, adult female; /, same from side, (a, Natural size; b-f, much 

 enlarged). (Marlatt.) 



Fig. 115. Phylloxe'ra vasta'trix: a, Root-galls; b, enlargement of same, show- 

 ing disposition of lice; c, root-gall louse, much enlarged. (Marlatt.) 



The grape Phylloxe'ra (Fig. 114) is a native aphid found upon the wild 

 grapevines of the eastern United States. It was introduced into the 

 south of France before 1863 upon rooted vines sent from America, and, 

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