Bui. 89, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate IV. 



Fig. 1.— Five-year-old grapevine with normally developed root-system; enlarged portion showing 



root fibers. (Original.) 



Fig. 2.— Four-year-old grapevine, showing result of feeding by larvae of the grape root-worm. 



(Original.) 



Destruction of Root Fibers by Larv/e. 



