Bui. 903, U. S. Dept. of Agriculture. 



Plate I. 



7 ig. 1. — Young raisin vineyard uninfested by Phylloxera. 









Fig. 2. — Old vinifera vineyard infested throughout ■with Phylloxera and showing empty spaces 

 ■where vines have been killed; vine in foreground shows less infestation by Phylloxera than 

 others near by, and would be rated at 7, but the canes show obvious stunting. 



The Grape Phylloxera in California. 



