SWEET-POTATO 453 



through and ruins the maturing potatoes (Fig. 197). No 

 treatment is known except to avoid storing or bedding 

 any infested roots, which may be recognized by the bur- 

 rows within them. Care should be taken to avoid intro- 



FIG. 197. CROSS SECTION THROUGH A SWEET-POTATO, SHOWING INJU- 

 RIES BY SWEET-POTATO ROOT-BORER. 



ducing this serious pest on sweet-potatoes brought east- 

 ward from the infested regions. 



For various leaf-eating insects, occasionally attacking 

 the foliage of this plant, the recommendation is to dip 

 the slips, before being set, in a solution of arsenate of lead, 



