Fiisariitm in Tuber Rot and Wilt of Potato 
13 
produce wilt, or whether the potato plant enjoys an effective or 
practical immunity rather than an absolute one. Even though 
WoLLEX WEBER (41) did not consider F. trichothecioidcs a wilt 
Fig. 1. — Tuber rot produced in laboratory with Fnsarium oxysporuni . and 
F. trichothccioides ; A. soft rot produced by F. oxysportiiii . incubated at 20° 
C. for 17 days. Early Ohio variety; B. exterior of tuber rotted by F. triclw- 
fhecioides. incubated at 20° C. for 17 days. Early Ohio variety; C. dry rot 
produced by F. trichothecioides. incubated at 20° C. for 17 days. Early Ohio 
variety. 
