5°8 
Journal of Agricultural Research 
Vol. XXIII, No. 7 
Species of the following fungi in several instances also have been found 
internal of seed corn: Aspergillus, Penicillium, Cladosporium, Altemaria, 
Rhizopus, Torula, Hormodendron, Chaetomium, Helminthosporium, 
and Spicaria. Colletotrichum cereale has also been found. Adams and 
Russell ( 2 ) have shown Rhizopus nigricans to be a parasite of the storage 
tissue of the scutellum and a limiting factor in germination. The junior 
writer has also noted the same condition for species of Penicillium and 
Aspergillus. It is possible the other forms are likewise concerned with 
inhibiting germination. Unlike the four species described above, these 
fungi are not so consistently found associated with seed corn, hence are 
of much less importance. Also several times we have met with two 
species of bacteria, a yellow organism and a white organism; the import¬ 
ance of these we have not determined. The extent of these associated 
fungi and bacteria as internal organisms is given in detail in the Table II, 
which shows the general distribution and prevalence of fungi internal of 
seed corn by samples from the several States. 
By a careful study of Table II it is occasionally seen that there are 
samples of com running low in germination that contain no internal 
parasites. The explanation of this may be root rot, so weakening the 
plants as to effect germination, or possibly storage difficulties which 
reduced viability. As a rule, weakened or impaired germination seems 
to be associated with internal infection, the most inhibiting parasites 
being Diplodia zeae and Gibberella saubinetii . 
Table II .—Distribution and prevalence of fungi internal of seed corn 
No.« 
State and variety. 
CePha- 
lospo~ 
rium 
sac¬ 
charic 
Gib¬ 
berella 
sau¬ 
binetii. 
Fusa- 
rium 
monili- 
forme. 
Di¬ 
plodia 
zeae. 
Other 
fungi. & 
Germination. 
Strong. 
Weak. 
iA 
iB 
xC 
iD 
2A 
2B 
2C 
2D 
3 A 
35 
3c 
3D 
4A 
4 b 
4 C 
4 D 
5 A 
SB 
6A 
6B 
7 A 
7 B 
DELAWARE 
Yellow Dent, local. 
Per ct. 
60 
Per ct. 
Perct. 
20 
Perct. 
Per ct. 
Per ct. 
90 
IOO 
IOO 
IOO 
90 
80 
IOO 
90 
IOO 
IOO 
IOO 
IOO 
80 
IOO 
IOO 
IOO 
IOO 
IOO 
IOO 
IOO 
IOO 
70 
Per ct. 
10 
.do. 
.do. 
.do. 
40 
IOO 
20 
Boone County White. 
10 
10 
.do. 
.do. 
.do. 
20 
Johnson County White. 
20 
IOO 
IOO 
IOO 
IOO 
80 
IOO 
IOO 
25 
10 30 
20 
.do. 
Yellow Dent, local. 
20 
50 
80 
.do. 
j 
White Dent, local. 
.do. 
60 
.do. 
_do. 
IOO 
Reid Yellow Dent. 
60 
80 
30 
a Letters A, B, C, D, etc., indicate different ears from same source. 
6 The small numbers in this column refer to the following numbered fungi: i, Aspergillus spp.; a, 
Cladosporium spp.: 3, Penicillium spp.; 4, Altemaria spp.; 5, Helminthosporium spp.; 6, Rhizopus spp.; 
7, Spicaria spp.; 8, Hormodendron spp.; 9, Torula spp.; 10, Chaetomium spp.; 11, Colletotrichum cereale\ 12, 
Bacterium spp. 
