Dec., 1923] 
SHERWOOD-FUSARIUM WILT OF TOMATO 
545 
quence of the fact that more clear weather prevailed than was the case in 
the preceding experiment, there was considerable fluctuation in the tem¬ 
perature of the greenhouse during the daytime. Occasionally the tempera¬ 
ture ran as high as 35 0 C. for a time. 
Experiment 3 
This experiment was conducted with a series of five flats of silt-loam soil 
of the same kind as that used in the preceding experiments. These flats 
were about six inches deep and held about ten kilograms of dry soil. The 
series was arranged as follows: 
Flat no. 1 received no treatment of calcium carbonate; flat no. 2 re¬ 
ceived 60 grams, or approximately five tons per acre; flat no. 3 received 120 
grams; flat no. 4 received 60 grams, and an additional application of 90 
grams of freshly slaked pure calcium oxide; flat no. 5 received 60 grams of 
the carbonate and 180 grams of the slaked oxide. 
The flats were placed in the autoclave and subjected to fifteen pounds’ 
pressure for two hours. Two days later the soil was inoculated and planted 
as usual. About the beginning of the first true leaf stage the plants were 
thinned out to 30 in each flat. The reaction of the soil and the results of the 
experiment are shown in table 3. 
Table 3. Influence of Reaction in Silt-Loam Soil on the Fusarium Wilt of Tomato Seedlings . 
Number of 
Flat 
Reaction of 
Soil, pH 
No. Plants 
Died in Four 
Weeks 
No. Plants not 
Wilted but 
Found In¬ 
fected 
No. Plants in 
Flat 
Percentage of 
Plants Dis¬ 
eased 
Percentage of 
Plants 
Dead 
I 
6.0 
15 
9 
30 
80.0 
50.0 
2 
6.4 
8 
10 
30 
60.0 
26.6 
3 
7.0 
4 
4 
30 
26.6 
13.3 
4 
74 
0 
3 
30 
10.0 
O 
5 
8.2 
0 
0 
30 
0 
0 
In this series an excellent gradation of the soil reaction was secured, that 
in flat no. 5 being markedly alkaline. It must be stated, however, that the 
plants in this flat made a very poor growth. Germination occurred promptly, 
but the plants lagged in growth, were very dark green in color, and pre¬ 
sented a generally unthrifty appearance. Every plant lived, however, and 
no indication of wilt infection could be detected when they were pulled and 
examined. The time of this experiment was coincident with that of experi¬ 
ment 2, hence the same fluctuations of temperature occurred as were 
mentioned in connection with that experiment. 
Experiment 4 
In preparation for this experiment the flats of soil that were used in 
experiment 2 were rearranged as follows: 
Sandy-loam series. Flats no. 1^4, no. 1, no. 3, no. 5, and no. 6 were re- 
