Mar. 12,1917 
Fusarium-Blight of the Soybean 
435 
bean stems bearing an abundance of sporodochia were macerated and 
mixed with the soil in two flats. Seed of the Mammoth Yellow variety 
were planted on May 25. When the experiment was concluded, August 
10, only 8 of the 80 soybean plants in these two flats were found to be 
infected. 
Table IV. —Results of growing soybeans and cowpeas in artificially inoculated soil , the 
plants having been wounded below the surface of the soil 
Organism. 
Host. 
Total 
number 
plants.^! 
Diseased plants. 
JPNumber. 
Percentage. 
Fusarium sp. on cowpea. 
f Cowpeas... 
[Soybeans... 
/ Cowpeas... 
(Soybeans... 
( Cowpeas.. . 
[Soybeans... 
M 
20 
20 
20 
20 
20 
20 
V 
i- 
3 
3 
6 
5 
0 
0 
15 
IS 
30 
25 
O 
O 
Fusarium sp. on soybean. 
None (control). 
Experiment IV.—This experiment was made with soybeans between 
September 26 and December 1 in an attempt to determine whether the 
presence of nematodes increases the number of infections. The nema¬ 
todes were introduced into the soil of large buried pots in root galls from 
living soybeans free from infection by Fusarium sp. The results are 
presented in Table V. 
Table V. —Influence of nematodes on the percentage of infection of soybeans with species 
of Fusarium 
Organism. 
Total 
number of 
plants. 
Number 
with 
nematode 
galls. 
Number 
with 
Fusarium 
sp. 
Fusarium sp. on cowpea and nematodes. 
IO 
IO 
2 
Fusarium sp. on cowpea without nematodes. 
IO 
O 
0 
Fusarium sp. on soybean and nematodes... 
IO 
IO 
3 
2 
Fusarium sp. on soybean without nematodes. 
IO 
0 
Nematodes only. 
IO 
IO 
0 
None (control).;. 
20 
0 
0 
Only one test of this kind was made; and it is significant to note that 
there was no increase in infection by the fungus, although the plants 
in all of the pots into which the galls had been introduced were attacked 
by eelworms. This experiment was concluded before the plants had 
matured. 
Experiment V.—Since the more porous types of sandy soil have 
generally been observed to favor the development of Fusarium spp., the 
cause of wilt diseases, an experiment was performed which was in dupli¬ 
cation of Experiment II, series 1, except that the soil consisted of a 
mixture of three parts of medium-coarse sand and one part of fine sandy 
