Journal of Agricultural Research 
Vol. XXI, No. 4 
I98 
the concentration up to 40 and 30 per cent, respectively, followed by a 
reverse of the process. 
With the exception of Penicillium sp. none of the organisms grew in an 
approximately 60 per cent solution. Two fungi, Diplodia tubericola and 
Boirytis cinerea, would not grow in a 50 per cent solution, and Sphaero- 
nema fimbriatum practically not at all at any concentration. It would 
appear from this table alone that a 10 per cent solution was the optimum 
concentration for growth of D. tubericola and Sclerotium bataticola; for 
Rhizopus tritici and Penicillium sp., 40 per cent; B. cinerea , 30 per cent. 
Fusarium acuminatum and Mucor racemosus do about equally well in 
concentrations of 10, 20, and 30 per cent. Whether or not Table IV 
gives a fair index of the optimum concentration for growth will be better 
understood after studying Tables V and VI. 
DRY WEIGHT OE MYCELIUM PRODUCED 
The dry weight produced by the various organisms in each flask was 
obtained separately, and the average weight from three flasks of each 
series is shown in Table V. 
Table V. Dry weight of mycelium 
[Expressed in grams] 
Series 
No. 
Percentage 
of dextrose 
by weight. 
Solutions. 
Fusarium 
acumin¬ 
atum. 
Diplodia 
tubericola. 
Rhizopus 
tritici. 
Mucor 
racemosus. 
f Control. 
I 
O 
Inoculated. 
O. OI50 
O. 0350 
O. 0300 
O. OI31 
II 
Control. 
IO 
Inoculated. 
. IO94 
1. 475 ° 
.4716 
• 337 S 
III 
f Control. 
20 
Inoculated. 
• I 35 2 
I. 0692 
• 6516 
.2519 
IV 
Control. 
30 
Inoculated. 
. 2049 
I. 6045 
. 6464 
. 1906 
Control. 
V 
40 
Inoculated. 
. 1329 
.8898 
. 3660 
. 1996 
VI 
Control. 
5 ° 
[Inoculated. 
O 
• 183s 
• 1915 
•2433 
VII 
60 
f Control. 
Inoculated. 
O 
O 
O 
O 
Series 
No. 
Percentage 
of dextrose 
by weight. 
Solution. 
Sclerotium 
bataticola. 
Penicillium 
sp. 
Botrytis 
cinerea. 
Sphaero- 
nema fim¬ 
briatum. 
Control. 
I 
0 
Inoculated. 
O. 0451 
O. 1682 
O. 0778 
O. 0126 
II 
Control. 
IO 
[Inoculated. 
2. 2482 
2. 6106 
• 2 743 
III 
Control. 
. OI91 
20 
[Inoculated. 
I. 8194 
2. 0308 
• 9 I 54 
. 02 20 
IV 
Control. 
30 
[Inoculated. 
1.4936 
2. 4063, 
I. 0215 
. 0102 
Control. 
V 
40 • 
Inoculated. 
.4858 
2. 1210 
. 08ll 
0 
VI 
[Control. 
50 ‘ 
[Inoculated. 
. III4 
I. 7470 
O 
0 
VII 
60 - 
Control. 
[Inoculated.. 
O 
.2717 
O 
0 
