Fusarium in Tuber Rot and Will of Potato 



13 



produce wilt, or whether the potato plant enjoys an effective or 

 practical immunity rather than an absolute one. Even though 

 Wollenweber (41) did not consider F. trichothccioides a wilt 



A 



B 



C 



Fig. 1. — Tuber rot produced in laboratory with Fusarium oxysporum, and F. tri- 

 chothccioides; A, soft rot produced by F. oxysporum, incubated at 20 C. for 17 days, 

 Early Ohio variety; B, exterior of tuber rotted by F. trichothccioides, incubated at 20° C. 

 for 17 days, Early Ohio variety; C, dry rot produced by F. trichothccioides, incubated 

 at 20° C. for 17 days, Early Ohio variety. 



