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 misrht 



Vt-/ 



B 



C 



I'n. 13. — Fusarium trichothecioides and F. oxysporum on sterile potato 

 cylinders; A, C, cylinders inoculated with /\ oxysporum, incubated for :.' 

 days at 25° C; B, cylinder inoculated with F. trichothecioides, incubated foi 



~ davs at :.'."> C. 



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

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



