PLATES 



Plate I. A commercial sweet potato bed in Texas 



Frontispiece 



TAOING PAGE 



Plate II. Fifty-acre field of sweet potatoes, Thomasville, 



Georgia. (Courtesy Clark Plant Co.) . . 30 



Plate III. Sweet potato field operations 56 



(After U. S. Dept. Agr.) 



Plate IV. Varieties of sweet potatoes 86 



(After U. S. Dept. Agr.) 



Plate V. Diseases of sweet potatoes 126 



(After U. S. Dept. Agr.) 



Plate VI. Sweet potato foot-rot 15S 



(After U. S. Dept. Agr.) 



Plate VII. Sweet potato diseases 188 



(After U. S. Dept. Agr.) 



Plate VIII. Sweet potato diseases ... .... 214 



(After U. S. Dept. Agr.) 



