Bui. 818, U. S. Dept. of Agriculture. 



Plate V. 



Fig. I. —Lettuce and Tomato Plants from 8-Inch Pots of Treated and 

 Untreated Infested Soil from Experiment Series II. 



B, Disease-freo root systems of tomato plants grown in pot receiving 3,000 c. c. of boiling water (98° C), 

 for comparison with^, lettuce plants, and C and i>, tomato plants, grown in check pots. Note on the 

 check plants the abundant nematode galls on the roots and stems and the numerous black Rhizoc- 

 tonia lesions. 



Fig. 2.— Treated and Untreated 8-Inch Pots of (A), Fresh Greenhouse and 

 (B), Infested Soil Containing Lettuce and Tomato Plants, Photographed 

 AT THE End of Experiment Series II. 



In the foreground note the smaller size and number of the plants in the check pots as compared with the 

 full stand and larger size of the plants in the pots in the background treated with 3,000 c. c. of boOing 

 water. 



