180 BOTANICAL GAZETTE [SEPTEMBER 
the major part of the potato troubles to the activity of this organism. 
Even though it is not the sole or even the main cause of Nebraska 
potato troubles it may play an important réle. The work of 
APPEL (2), Corsautt (8), DRAYTON (9), and Morse and Scuap- 
OVALOV (26) gave results similar to those obtained by Rotrs 
(31, 32). 
Fic. 2.—Wilt produced in laboratory with Fusarium trichothecioides, and control 
plant; 4 control, Early Ohio variety; B, wilting and drying of leaves, 4 days after 
inoculation, Early Ohio variety. 
On March 13, 24 plants grown in sterile soil were used in another 
experiment. These plants were about 10 cm. high at the time. 
The soil was removed from one shoot in each pot and the pots were 
arranged in 6 series. In series A the shoots were wounded and the 
wound smeared with F. oxysporum infected rice; in series B the 
sound stem was smeared with F. oxysporum infected rice; in series 
C the wounded shoots were smeared with F. trichothecioides infected 
rice; in series D the sound stems were smeared with F. tri- 
chothecioides infected rice; in series E no inoculum was applied to 
the wounded shoots; in series F the soil was merely removed and 
replaced (figs. 2 and 3). 
