A Dry Rot of the Irish Potato Tubw 
57 
Pig. 13. Inoculation of White Ohio tubers thru punctures. Photo- 
graphed five weeks after inoculation. Kept in a moist chamber at 
25° to 27° C. Only 4 successful infections out of 30 were secured, — 
the punctures as a rule simply dried out. 
Table 21. — Inoculations made March 25 or 28 and examination 
made on April 25. The tubers were kept at 8° to 10° G. in 
moist chambers. 
Method of 
inoculation 
No. of j No. of in- No. of 
tubers in- oculations successful 
oculated per tuber inoculations 
Eye puncture . . . 
Eye surface 
Eye surface 
Stem end 
Lenticel 
Lenticel 
Puncture 
Epidermis re- 
moved 
Epidermis re- 
moved 
Surface not at 
lenticel 
Surface not at 
lenticel 
30 
0 
0 
1 
0 
0 
30 
18 
4 
0 
0 
Medium 
used 
Yes 
No 
Yes 
No 
Yes 
No 
Yes 
No 
Extent of rot 
1 to 3 cm. deep 
