Bui. 1417, U. S. Dept. of Agriculture 



Plate 5 



Fig. I.— Portion of an Old Infected Cotton Root in a Moist 



Chamber 



Note the white mycelium on the roots and the brown strand hyphse growing upon the sur- 

 face of the filter paper. Photographed by R. D. Martin ( X 3) 



Fig. 2 —Small Clump of Soil Taken from a Depth of About 4 Inches 

 in a Zone of Active Strand Hyph/e in Advance of the Wilting 

 Cotton Plants 



Photographed by H. F. Loomis (X 3) 



