28 Agricultiiral I^xperuaent ^Station Research lUiUetin Uf. 
EXPERIMENT IV. — Since it was thought that the strains of 
Fusavium on soy bean had to a degree lost their virulence by 
growth in culture, soy bean steins bearing an al)undance of sporo- 
dochia were macerated and mixed with the soil in two flats. Seed 
of the ^lammoth Yellow variety were planted on ^lay 25. When 
the experiment was concluded, August 10, only 8 of the 80 soy 
bean plants in these two flats were found to be infected. 
EXPERIMENT V. — This experiment was designed to con- 
firm the results of inoculations in the greenhouse by inoculations 
under partially controlled field conditions. Four small plots 
(Nos. 2G, 27, 28, and 29) on wilt-free soil of the station farm 
were inoculated with the F. tracheiphilum from soy bean; two 
others (Nos. 59 and GO) with this organism from cowpea, and two 
(100 and 101) wore left untreated as controls. Thirty cowpeas 
and thirty soy beans were planted in each plot on June 10, and 
the final results noted in Table 5 were obtained on September 4. 
Table 5. — Results of cross-inoculations in the field. 
1 
1 o o 
■ 
Organism 
1 
i Host 
i Total 
number 
of plants 
Disea.sed plants 
No. 
Percentage 
26 
Fusarium sp. 
on soy bean 
Clay cowpeas 
Haberlandt soy beans 
30 
30 
17 
4 
1 56.6 
1 13.3 
1 
27 
do 
Clay cowpeas 
30 
10 
; 33.3 
Tokio soy beans 
30 
0 
1 0.0 
28 
do 
Clay cowpeas 
I 30 
10 
i 33.3 
28 
do 
Mammoth yellow’ soy beans. 
1 30 
8 
: 26.6 
29 
do 
Clay cowpeas 
1 30 
15 
£0.0 
Tar Heel Black soy beans. . . 
I 30 
3 
; 10.0 
59 
Fiifarium sp. 
i Clay cow’peas 
30 
26 
; 86.6 
on cowpea . 
1 Tokio soy beans 
30 
6 
: 20.0 
60 
i (to ; 
Clay cowpeas 
30 
17 
i 56.6 
60 
1 do 
j 
; Mammoth Yellow’ soy beans. , 
30 
6 1 
I 
20.0 
100 
i None 
Clay cowpeas 
30 
0 
0.0 
(control)... 
Mammoth Yellow soy beans. 
30 
0 ! 
0.0 
101 
! do 1 
Clay cowpeas 
30 
0 I 
0.0 
; ! 
Mammoth Yellow’ soy beans. 
30 
« i 
0.0 
EXPI^KIMEN'r — On May 25, 191G, two 100-foot rows 
of each of the sov bean varieties d’okio, llaberlandt, ^Mammoth 
