Nov. i, 1915 
Potato Tuber-Rots Caused by Fusarium Spp. 
201 
Table V.— Results of the inoculation of different varieties of potatoes with original and 
reisolated strains of Fusarium eumartii 
Strain No. 
Variety of potato. 
Number of 
tubers. 
Incubation 
period. 
Average 
temperature. 
Percentage 
of tubers 
rotting. 
Days . 
•c. 
Jersey Peachblow... 
3 
19 
23. 1 
IOO 
Idaho Rural. 
14 
1 9 
23. 1 
100 
2 93 2 . 
Early Rose. 
4 
19 
23. 1 
IOO 
People’s. 
4 
19 
23. 1 
IOO 
Jersey Peachblow... 
4 
19 
23. 1 
IOO 
Idaho Rural. 
19 
19 
23. 1 
IOO 
2 947 . 
Early Rose. 
4 
19 
23. 1 
IOO 
People’s. 
4 
19 
23. 1 
IOO 
Netted Gem. 
9 
21 
25. 6 
IOO 
3 ° 4°> 2 947 . 
Idaho Rural. 
14 
21 
25. 6 
IOO 
People’s. 
, 5 
21 
25. 6 
IOO 
f *5 
<55 
13.8 
IOO 
3040 . 
Idaho Rural. 
1 15 
6S 
17. 2 
IOO 
l IS 
65 
18. 6 
IOO 
(Jersey Peachblow... 
3 
19 
23. 1 
IOO 
1 Idaho Rural. 
18 
19 
23. 1 
IOO 
2 95 °. 
| Early Rose. 
3 
19 
23. 1 
IOO 
[People’s. 
3 
19 
23. 1 
IOO 
>™reisolation of. 
CONTROL INOCULATIONS OF POTATO TUBERS 
In order to ascertain whether any organism at random would cause a 
decay of potato tubers under the conditions used to establish the wound- 
parasitic property of the species mentioned, certain species of Fusarium 
and other organisms inhabiting potato tubers were included in the exper¬ 
iments. The following organisms were used for this purpose: F. martii , 
F. solani , F. moniliforme , VerticUlium albo-atrum, Sporotrichum flavissi- 
mum , a species of Mucor, and a species of Rhizoctonia, The notes on the 
effect of these organisms on different varieties of potatoes at sundry tem¬ 
peratures are extracted from the several experiments and grouped accord¬ 
ing to organism as a support of the method. It may be mentioned in 
this connection that certain strains of F. radicicola (Nos. 2862 and 3319) 
were found to be comparatively inactive under conditions identical with 
those in which other strains were most virulent. 
INOCULATION OF POTATO TUBERS WITH CERTAIN SPECIES OF FUSARIUM 
AND OTHER TUBER-INHABITING ORGANISMS 
F. solani 176; isolated in 1908 by Dr. Wollenweber at Dahlem, near 
Berlin, Germany, from a potato tuber. Used for the original descrip¬ 
tion of this species by Appel and Wollenweber (i,p. 77). Culture used, 
2-months-old pionnotes on potato cylinder. After 51 days at an average 
temperature of 21.5 0 C., this organism had attacked only 50 per cent of 
but one variety, Pearl, and then only where a large cut surface was 
