16 
Research Bulletin No. p 
the major part of the potato troubles to the activity of this organism. 
E\'en though it is not the sole or even the main cause of Nebraska 
potato troubles it may play an important role. The work of 
Appel (2), CoRSAULT (8), Draytox (9), and Mor.se and Schap- 
ovALOV (26) gave results similar to those obtained by Rolfs 
^31,32). 
^ B 
Fig. 2. — Wilt produced in laboratory with Fusariiiiii tricJiofhccioides. and 
control plant; A, control. Early Ohio variety; B, wilting and drying of leaves, 
4 days after inoculation, Early Ohio variety. 
On ]\Iarch 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 remo\ed 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. o.vysponmi infected rice; in series B the 
sound ^tQm was smeared with F. oxysponim infected rice; in series 
C the wounded shoots were smeared with F. tricJwtliecioides 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 wotmded shoots ; in series F the soil was merely removed and 
rei)laced ( figs. 2 and 3 ) . 
