436 Journal of Agricultural Research voi. vm, no. n 
loam and stable manure. The results obtained between September 7 
and the close of the experiment, November 20, show considerable in¬ 
crease in the percentage of infection over those in the more compact, 
fine sandy loam of the preceding experiments even though the cultures 
used were transfers from cultures nearly 3 months old. Cultures of the 
strain of Fusarium on cowpea were added to flat G, of the species of 
Fusarium on soybean to flat H, and flat J was held as a control. Table 
VI contains the data on this experiment. 
Table VI .—Influence of soil on percentage of infection by Fusarium spp. 
Flat. 
Organism. 
Host. 
Total 
number of 
plants. 
G 
Fusarium sp. on cowpea.... 
r Cowpeas... 
/Soybeans... 
r Cowpeas... 
[Soybeans... 
r Cowpeas... 
[Soybeans... 
20 
H 
Fusarium sp. on soybean.. 
20 
20 
j 
None (control).. 
20 
20 
20 
Diseased plants. 
Number. 
Percentage. 
16 
80 
12 
60 
13 
65 
12 
60 
0 
0 
0 
0 
Experiment VI.—This experiment was designed to confirm the results 
of inoculations in the greenhouse by inoculations under partially controlled 
field conditions. Four small plots (No. 26, 27, 28, and 29) on wilt-free soil 
of the station farm were inoculated as in the previous experiments with 
pure cultures of the species of Fusarium on soybean; plots No. 59 and 60 
were inoculated with the Fusarium sp. on cowpea; and two others (100 
and 101) were left untreated as controls. Thirty cowpeas and thirty 
soybeans were planted in each plot on June 10, and the final results 
noted in Table VII were obtained on September 4. 
Table VII.— Results of cross-inoculations in the field 
Plot 
No. 
Organism. 
Host. 
Total 
number 
of 
plants. 
Diseased plants. 
Number. 
Percentage. 
26 
27 
28 
29 
59 
60 
100 
iox 
Fusarium sp. on 
soybean. 
_do. 
_do. 
.... .do. 
Fusarium sp. on 
cowpea. 
....do . 
None (control). . 
_do. 
relay cowpeas. 
[Haberlandt soybeans. 
/Clay cowpeas.. . 
[Tokio soybeans. 
(Clay cowpeas. 
\Mammoth Yellow soybeans 
relay cowpeas. 
[Tar Heel Black soybeans. 
relay cowpeas. 
[Tokio soybeans... 
K cowpeas. 
imotn Yellow soybeans 
relay cowpeas. 
[MammothYellow soybeans 
/Clay cowpeas. 
[MammothYellow soybeans 
30 
30 
30 
30 
30 
30 
30 
30 
30 
30 
30 
30 
30 
30 
30 
30 
17 
56.6 
4 
i 3-3 
10 
33-3 
0 
0. 0 
10 
33.3 
8 
26.6 
15 
50. 0 
3 
10. 0 
26 
86.6 
6 
20. 0 
17 
56.6 
6 
20. 0 
0 
0. 0 
0 
0. 0 
0 
0. 0 
0 
0.0 
