Fusaruim in Tuber Rot and Wilt of Potato 



39 



bilitv permitted only N/200 solutions. In the case of the higher 

 fatty acids and oils, the material was weighed out as though N/100 

 solutions were being prepared. With these no weighings of the 

 material formed were attempted, but merely differences in luxuri- 

 ance of growth were recorded. To those acids which showed no 

 growth with N/100 solutions, 5 cc. of 10 per cent glucose solution 

 were added, making the sugar concentration 1 per cent, so as to 

 determine whether the acid was merely non-usable, or whether 

 it was toxic. Since it was found that some were toxic at N/100 con- 

 centration, lower concentrations were made up also. The results 

 are given in table IN. 



TABLE VIII 



Dry weight (in milligrams) formed with the following carbon compounds 

 as carbon sources 



Formic acid N 100 

 + 5 cc. 10 per cent glu- 

 cose solution 



Acetic acid N/100. . . 

 + 5 cc. 10 per cent glu- 

 cose solution 

 Proprionic acid N 100 

 -i-5 cc. 10 per cent glu- 

 cose solution 

 Butyric acid X 1(10 

 + 5 cc. 10 per cent glu- 

 cose solution 

 Glycocollic acid N 100. 

 Lactic acid N 100 

 Oxalic acid N loo 

 Succinic acid N 100 . . . 

 Malic acid N 100 

 Tartaric acid N 100. . . 

 Citric acid X loo 

 Aspartic acid X 200 

 Asparagin X 200 

 Tannic acid 1 per cent 

 Tannic acid 0.5 per cent 

 + 5 cc. 10 per cent glu- 

 cose 



Control 0.5 gm.levulose 



Fusaruim TRICHOTHECIOIDES 



Xumher of days 



6 



Xone 



12 



None 



106 



Xone 



2.5 7.3 



0.3 0.6 



Xon-weighable 



Xon-weighable|Xon-weighable 



Xon-weighable Xon-weighable 



Fusarium oxysporum 



Xumber of days 



12 



Xone 



85.5 

 10.6 



1.0 

 2.6 

 1.6 

 3.5 

 1.0 

 1.6 



0.93 

 6.6 



3.8 

 31.0 

 61.0 



32.0 

 82.0 



