Aug. i, 1921 
Two Sclerotium Diseases of Rice 
653 
lated with sclerotia from the wheat fungus. Here the percentage of 
germination in inoculated soil was only 29.9, as compared with 66.3 in 
uninoculated soil. There was a germination of 59 and 71.5 per cent, 
respectively, in soil inoculated with the soybean fungus and in uninocu¬ 
lated soil, and a germination of 68.5 and 72 per cent, respectively, in 
inoculated and uninoculated soil where the tall oat grass form was used. 
The difference in the case of the tall oat grass form could easily have 
been a variation in individual controls, as some of them ran as low as 
63 per cent. There was a noticeable reduction, however, where the soy¬ 
bean fungus was used as the inoculum. Diseased plants in these experi¬ 
ments continued dying until the irrigation water was applied, after 
which time all plants recovered, if not too severely damaged. The high 
percentage of chlorotic or pseudo-albino plants was very striking where 
the disease was present. A high percentage of these chlorotic seedlings 
died before irrigation. 
Table) II. —-Results oj germination of Honduras rice in so l resown on June 2Q, iqzo , 
after removal of a crop 7 weeks old 11 
Can 
No. 
3 
4 
5 
6 
7 
8 
9 
3 
4 
5 
6 
7 
8 
9 
3 
4 
5 
6 
7 
8 
9 
3 
4 
5 
6 
7 
8 
9 
Source of fungus. 
Treatment. 
Percentage 
of germi¬ 
nation. 
1 
Number of 
plants 
chlorotic. 
Rice. 
Inoculated. 
67 
0 
.do. 
... .do .. . 
rn 
.do. 
Reiuoculated 
jV 
.do. 
Inoculated 
Si 
.do. 
.do.... 
6 ,\ 
.do. 
.do. 
7 < 
.do. 
Control 
1 j 
7/1 
° 
Tall oat grass. 
Inoculated. 
/4 
7 C 
.do. 
6l 
.do. 
Reiuoculated 
.do. 
Inoculated 
7 C 
.do. 
/ J 
7/1 
.do. 
i 4 
67 
.do. 
Control 
Soy bean. 
Inoculated 
/ 4 
.do. 
/4 
7 c 
.do. 
Reinoculated 
/ D 
.do. 
Inoculated. . 
/ u 
/ 
.do. 
4 
7/1 
.do. 
/ 4 
CO 
.do. 
Control. . 
jy 
Wheat. 
Inoculated 
/ u 
60 
80 
.do. 
Reinoenlated 
.do. 
Inoculated 
4 1 
5 
.do. 
76 
.do. 
/ u 
.do. 
Control 
u 4 
68 
Number of 
plants 
dead 
before 
irrigation. 
O 
5 
o 
2 
O 
O 
O 
O 
4 
o 
o 
o 
& I 
o 
o 
2 
O 
I 
O 
O 
1 
3 
8 
o 
2 
o 
o 
a At the time of the first seeding the soil was inoculated with Sclerotium rolfsii from rice, soybean, tall 
oat grass, and wheat. Can No. 5 in each series was reiuoculated. 
b Worm injury. 
