1417, U. S. Dept. of Agriculture 



Plate 2 



Fig. 



-A Typical Spot of Root Rot in an Alfalfa Field 



The dead zone with weeds growing in the center is shown just after cutting. The trenches 

 described in the text were made in a spot almost identical with this one. Photographed 

 by H. F. Loomis at the United States Field Station, Sacaton, Ariz. 



r » 



ZONE 



Fig. 2 — Excavated Alfalfa Plants 



The various root and foliage symptoms in the different zones of the root-rot spot are shown. 

 Photographed by H. F. Loomis 



