Bui. 818, U. S. Dept. of Agriculture. 
Plate III. 
Fig. I. —Roots and Stems of Tomato Plants Taken from 8- Inch Pots of 
Treated and Untreated Infested Soil, Shown in Plate II, Figures I and 2. 
A, Large disease-free rootsystems of plants grown in a pottreated with 3,000c. c. of boiling water (98° C.) 
(natural size); B, smaller root systems of plants grown in a pot receiving 1,000 c. c. of boilng water 
(natural size). Note occasional nematode galls on lower part of roots and a small number of dark 
Rhizoctonia root lesions. C, Roots and stem of plant from check pot (enlarged 2 -J- times). Note large 
galls on stem and old part of root system and small galls on younger, newly formed root system. It 
should also be noted that the lower part of the taproot and practically all of the secondary roots have 
been destroyed by the pathogenes. 
Fig. 2— Bench Sections No. 3 (Left) Treated with 17,000 c. c. (3.6 Gallons) 
Per Cubic Foot of Soil of Boiling Water (98° C.) and No. 4 (Right) Un- 
treated Check, Experiment Series I. 
Note the differences as to number, size, and vigor of plants in the two sections. Pronounced differences 
in the root systems of the lettuce plants taken from these sections are shown in Plate IV, figure 1. 
