Bui. 226, Bureau of Plant Industry, U. S. Dept of Agriculture. 



Plate IX. 



.p-( ^ 



^ 





'-^, 



"> 



^^ 



^y%«>^ 



Fig. 1.— Roots of Tomato Plant Deformed by Nematodes. 



Fig. 2.— Root-Knot of Muskmelon Due to Nematodes. 



Fig. 3.— Leaves of Lima Bean, Showing Leaf-Spot Due to Cercospora Canescens. 



