PLATE XIX 



Tuber-rot produced in the laboratory with Fusarium eumartii, n. sp., and control 

 potato tuber: 



Fig. I, 2. — Control. 



Fig. 3. — Potato tubers showing a soft-rot, as a result of rapid development. Incu- 

 bation period ig days at room temperature. People's variety. 



Fig. 4, 5. — Potato tubers selected to illustrate the type of rot in slower develop- 

 ment. Jersey Peachblow variety. 



