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



Plate I. 



.^ 



\\ 



B 



Fig. I.— Tomato Plants from Treated and Untreated 4-Inch Pots of Experi- 

 ment Series I. 



B, Uninfected healthy roots grown in nematode and fungous infested soil submerged for 2J minutes in 

 boiling water (98° C.) (natural size); A and C, plants with nematode root and stem galls and Rhizoe- 

 tonia root disco lorations grown in untreated infested soil in check pots. (Enlarged three times.) 



Fig. 2— Four-Inch Pots of Experiment Series I Two Weeks After Planting. 



Note the full stand and vigorous appearance of the tomato seedlings in pots A,B, and C submerged for 

 1\, 5, and 10 minutes, respectively, in boiling water, compared with the very poor stand, smaller size, 

 and dampiag-ofl of plants in the untreated check pot B. 



