10 
BULLETIN 818, U. S. DEPARTMENT OF AGRICULTURE. 
Photographs were taken to illustrate the more important results 
secured. 
Table III. — Soil-disinfection tests with tomato plants grown in 4-inch pots, with hot 
water treatment, in May and June, 1918. 
[Two kinds of soil were used: Soil A was nematode and fundus infested; B was uninoculated fresh green- 
house soil.] 
Kind of soil and 
treatment of 
soil-filled pots. 
Soil A : 
Immersed in 
boiling 
water— 
2\ minutes 
5 minutes. 
10 minutes 
Check (im- 
mersed i n 
cold water). 
Soil B: 
Immersed i n 
boiling 
water— 
2J minutes 
5 minutes. 
10 minutes 
Check (im- 
mersed i n 
cold water). 
Num- 
ber of 
plants. 
Results observed on June 12 (end of experiment). 
Nematode infestation 
of roots. 
Notes on disease, size, and vigor of 
plants. 
gfikh*-' 
40 
41 




37 
37 




46 
48 




47 
47 




38 
38 




40 
46 




48 
49 




51 
49 




55 
55 




37 
33 
23 
4 
6 
33 
3s 
33 
17 
10 
6 
33 
25 
15 
14 

1 
15 
51 
49 




70 
70 




71 
67 




51 
51 




55 
57 




37 
34 




58 
50 




38 
38 




50 
50 




47 
40 


6 
6 
22 
23 


7 
/ 
3(3 
34 


8 
8 
20 
21 


11 
11 
23 
24 


12 
12 
19 
17 


1 
1 
aj t 
1 Abbreviations used: HV= Healthy and vigorous; SY= Stunted and yellow. 
2 Much smaller than in treated soil. 
DISCUSSION OF RESULTS. 
A close study of Table III reveals a striking confirmation of the 
results secured in the 4-inch, pot treatments of Experiment Series I. 
All treatments completely eliminated nematode infection and damp- 
ing-off, almost eliminated Rhizoctonia, greatly increased the percent- 
age of germination, and markedly stimulated the growth of the 
>*; 
