A Dry Rot of the Irish Potato Tuber 
55 
Figs. 9, 10. Inoculation of Early Ohio tubers thru punctures. Photo- 
graphed four weeks after inoculation. Kept over CaCl 2 ; the first 
week at 8° to 10° C. and then at laboratory temperature. 
Table 18. — Puncture inoculations made on White Ohio tubers, 
in all cases medium being applied. 
Method of 
inoculation 
No of 
inocula- 
tions 
Xo. of in- 
fections 
'Extent of rot 
Temperature 
Humidity j 
Surface puncture 
30 
4 
Slight 
25 to 27 J C. 
Saturated air 
Surface puncture 
54 
51 
3 cm. deep. . . 
25 to 27 C 
Over CaClo 
Surface puncture 
6 
4 
Very slight . . . 
25 to 27 C. 
Over H>S0 4 
Surface puncture 
30 
30 
1 cm. deep . . . 
8 to 10 C. 
Saturated air 
Eye puncture . . . 
30 
0 
25 to 27 C. 
Saturated air 
Eye puncture .... 
3 
0 
25 to 27 C. 
Over H..S0 4 
Eye puncture 
3 
0 
25 to 27 C. 
Over H..SO4 
Eye puncture 
30 
30 
1 to 3 cm. deep 
8 to 10 C. 
Saturated air 
