A Dry Rot of the Irish Potato Tuber 
79 
The data in the above table and other unpublished data show 
rather clearly that the organism sent us by Orton as the 
Fusarium oxysporum of Smith and Swingle differs from the 
Fusarium tuberivorum in several important particulars. Conse- 
quently as early as 1909 the Nebraska organism was considered 
in this laboratory a new or undescribed species and a tentative 
name had been given to it. 
Smith and Swingle 1904 combined Fusarium solani, Fusarium 
pestis, Fusarium oxysporum, and other species of this genus, 
found on potatoes, under the name Fusarium oxysporum* 
Appel and Wollenweber lOlOf examined a culture of Fusa- 
rium oxysporum sent them by Orton from Oregon potatoes, and 
decided that this organism should be called Fusarium ortho- 
ceras. 
RESISTANCE AND SUSCEPTIBILITY. 
During the winter of 1911-1912 extensive experiments were 
conducted to determine the comparative resistance of tubers of 
different varieties of potatoes to invasion by this fungus. Tho 
the detailed results of these and many previous similar ones are 
reserved for future publication, it seems well here to present the 
general results. From Colorado, thru the kindness of F. L. Fitch 
were secured the following sorts : 
1. Bliss Triumph 7. Norton's Beauty 
2. Burbank 8. Pearl 
3. Early Ohio 9. Raleigh 
4. Early Rose 10. Russet 
5. Gold Coin 11. White Ohio 
6. Green Mountain 
From Minnesota, thru the kindness of A. R. Kohler of the 
Minnesota Experiment Station, were secured tubers of the fol- 
lowing sorts: 
1. Early Ohio 2. Raleigh 
* Lindau 1908 questions the wisdom of this treatment (p. 470), and 
says: "Man kann bei den verschiedenen Symptomen, welche die drei 
beschriebenen Krankheiten haben, zweifelhaft sein, ob man dieser Ansicht 
beipflichten soil; * * * Man tut wohl am besten, bis durch Kultur und 
Impfung dieser Punkt geklart ist, die Verschiedenheit der Krankheiten 
und ihrer Erreger noch aufrecht zu erhalten." 
f (L. c, page 146). "Um vollig sicher zu gehen, dass beide Pilze 
identisch sind, erbaten wir eine Kultur des F. oxysporum der Verfasser. 
Wir erhielten eine solche durch die Giite des Herrn E. F. Smith, zwar 
nicht eine Originalkultur, sondern eine in Oregon von Herrn W. A. Orton 
aus 'Dry rot' — kranken Kartoffeln geziichtete Art. Die letztere war im 
Reagensglase verschlossen Herrn Smith nach Washington zur Diagnosti- 
zierung iibersandt worden, wurde aber den 27. IV. 1909 uneroffnet nach 
Deutschland weitergeschickt als vermutlich F. oxysporum Smith und 
Swingle." 
