56 
Research Bulletin No. 1 
The White Ohio tubers did not prove as susceptible as the 
Early Ohio tho the rotting was related in the same manner to 
the factors mentioned in the summaries. At the lower tempera- 
tures and with high relative humidity successful inoculations 
were secured in each case. 
Table 19. — Inoculation experiments made with the White Ohio 
tubers. In all these cases the tubers were subsequently kept 
in a saturated air at 25° to 27° C. The final examination 
icas made on April 18 tvith the results indicated. 
Method of inoculation 
No. of tubers 
inoculated 
No. of inocula- 
tions per tuber 
No. of successful 
inoculations 
5 
6 
Eye surface 
10 
6 
s 1 
Stem-end surface 
10 
6 
Lenticel surface 
10 
6 
0 
Surface puncture 
5 
6 
4 
Epidermis removed 
10 
6 
0 
Figs. 11, 12. Inoculation of Early Ohio tubers thru punctures. Photo- 
graphed four weeks after inoculation. Kept in a chamber with a 
small dish of water; the first week at 8° to 10° C. and then at labora- 
tory temperature. 
Table 20. — Inoculation experiments with White Ohio tubers are 
reported in the following table. Examination made March 
18, seven days after inoculation. 
Method of 
inoculation 
No. of 
tubers in- 
oculated 
No. of in- 
oculations 
per tuber 
Humidity 
Temperature 
Extent 
of rot 
Surface puncture . 
Eye puncture 
Epidermis removed 
6 
3 
6 
6 
6 
3 
6 
Over H,SOi . . . 
Over H. 2 SOi . . . 
Over H,S0 4 . . . 
Over H 2 S0 4 . . . 
Moist chamber 
Moist chamber 
Moist chamber 
25 to 27° C. 
25 to 27 C. 
25 to 27° C. 
25 to 27° C. 
25 to 27° C. 
25 to 27 3 C. 
25 to 27 ' C. 
None 
None 
None 
None 
Slight 
None 
None 
Surface puncture. . 
Eye puncture 
Epidermis removed 
