Fusarmm in Tuber Rot and Wilt of Potato 
41 
grew in N/250 solution. N/250 butyric acid was toxic to F. tri- 
chothecioides, while F. oxysponim grew in it. 
TABLE IX 
Dry weight (in milligrams) formed in 12 days in various 
concentrations of acid 
Concentration 
FUSARIUM OXYSPORUM 
N/1000 N/500 
N/250 N/125 
FUSARIUM trichothecioides 
N/1000 N/500 N/250 N 125 
Formic acid 
I 
II 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
None 
None 
Average . 
Acetic acid 
I 
II 
Average . 
0.8 
0.8 
0.8 
1.2 
2 
1.6 
3.2 
3.4 
3.3 
Proprionic acid 
I 
II 
Average. . . 
1.4 
2.6 
2.0 
2.0 
2.4 
2.2 
5.0 
5.8 
5.4 
None 
1.4 
1.2 
1.8 
2.6 
3.4 
3.0 
4.0 
6.6 
5.3 
Butyric acid 
I 
II 
Average . 
4.8 
5.4 
5.1 
7.6 
9.0 
8.3 
10.4 
13.8 
12.1 
None 
2.4 
3.6 
3.0 
5.0 
5.6 
5.3 
None 
Oxalic acid 
I 
II 
Average 
0.4 
0.8 
0.6 
0.4 
1.2 
0.8 
0.4 
1.2 
0.8 
1.2 
1.2 
1.2 
0.8 
0.8 
0.8 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
Non- 
weigh- 
able 
A set of experiments was run also in which solanin in various 
percentages was added to glucose media. Because of the high 
cost of solanin, only 1 cc. solution was used in each test. The 
results are given in table X. 
These differences, that is, greater versatility in the use of carbon 
sources, greater resistance to inhibition, and intoxication, may well 
