B . 25, Bureau of Plant Industry, U. S. Dep*. of Agriculture. 



Plate III. 



Fig. 1.— Field Infected by Wilt and Root-knot. 

 In. ii cowpea, resistant; Speckled cowpea, killed. 



Fig. 2.— Roots of Iron Cowpea. 



Fig. 3.— Root-knot on Wonderful 

 Cowpea. 



From adjoining rows in the same field. 



