198 
Journal of Agricultural Research 
Vol. V, No. 5 
F. radicicola 3319; isolated November, 1913, in association with Mucor 
sp. 3320 from a “leaky” diseased potato tuber from Moorland, Cal. 
Culture used, i-month-old pionnotes on a potato cylinder. This strain 
was similar to 2862, being comparatively inactive. After 51 days’ 
incubation at 21.5 C., only 1 tuber of 16 inoculated developed a rot. No 
attempt was made Ito recover the organism. 
The results of the inoculations With F. radicicola are given in Table IV. 
Table IV .—Results of inoculation of different varieties of potato with original and reiso¬ 
lated strains of Fusarium radicicola 
Species and strain No. 
Variety of potato. 
Number of 
tubers. 
Incubation 
period. 
Average 
temperature. 
Percentage 
of tubers 
rotting. 
Days , 
°C. 
Fusarium radici- 
Burbank. 
20 
20 
23. O 
cola 2890. 
Fusarium radici- 
.do. 
T A 
23.0 
cola 2890 .and 
Rhizoctonia sp. 
2892. 
A 4 
100 
Fusarium radici- 
Irish Cobbler. 
5 
10 
O A 
23-3 
20. 2 
cola 320i]>2890. 
88 
100 
10 
88 
19. 6 
100 
25 
88 
18.7 
100 
10 
88 
17*5 
100 
6 
88 
IS-1 
100 
6 
88 
12. 5 
0 
Fusarium radici¬ 
cola 3023>289o.. 
[Netted Gem. 
< Idaho Rural. 
[People’s. 
10 
14 
A 
21 
21 
21 
20 
25.6 
25. 6 
25. 6 
23. 0 
100 
100 
Fusarium radici- 
Burbank. 
8 
cola 2998. 
Fusarium radici- 
Green Mountain.... 
4 
51 
16. 3 
0 
cola 3236. 
4 
5 1 
17 
SO 
4 
5 i 
17.8 
50 
4 
5 i 
18.4 
75 
1 
14 
25*7 
100 
Fusarium radici- 
9 
24 
24. 6 
100 
Burbank. 
25 
20 
23.0 
cola 2862. 
[Idaho Rural. 
A 
Si 
Si 
SI 
C T 
21.5 
21. 5 
21. 5. 
Fusarium radici- 
1 Netted Gem.... 
A 
25 
cola 2210. 
1 Burbank. 
A 
4 
[Pearl.. 
A 
21- 5 
0 A 
>—reisolation of. 
A NEW DRY-ROT CAUSED BY PUSARIUM EUMARTII 
A type of field and storage rot hitherto undescribed was frequently 
observed in the examination of potatoes from Pennsylvania during the 
last two years. The character of this rot is as follows: In mild infection 
of the stem end the tuber shows externally a darkened sunken area with 
a greenish luster about the stolon insertion. If a thin slice is cut at this 
point, the parenchyma and the vascular ring are seen to be browned to 
varying depths. Some of the.bundles are discolored to a greater depth 
