Fusarium in Tuber Rot and Wilt of Potato 



35 



would have to destroy a tissue whose walls are mainly cellulose 

 by intercellular activity, while one that could digest cellulose might 



XLS 



B 



C 



Fig. iT,.—Fusarimn trichothecioides and F. oxyspontm on sterile potato cylinders; 

 A, C, cylinders inoculated with F. oxysporum, incubated for 2 days at 25°C; B, 

 cylinder inoculated with F. trichothecioides, incubated for 2 days at 25 C. 



destroy this tissue by a primary cell invasion. Again, a greater 

 ability on the part of an organism to digest suberin, other things 



