^24 Journal of Agricultural Research voi. xvin, no. lo 



CONCLUSIONS 



(i) A certain degree of correlation exists between the temperature 

 relations of some potato fungi in pure cultures and their geographical 

 distribution and seasonal occurrence. The correlation is particularly 

 striking in the wilt-producing fungi, Fusarium oxysporum and Verticil- 

 Hum albo-atrum. 



(2) A temperature of about 40° F. should hold Fusarium tuber rots 

 in check during storage. 



(3) The susceptibility of Verticillium albo-atrum to high temperatures 

 suggests the possibility of a heat treatment for infected seed tubers. 



(4) Temperature tests in certain cases may serve as a useful supple- 

 mentary method for the identification of fungi exhibiting contrasting 

 thermal relationships. 



