CONTENTS 



PAGE 



Introduction . . ...... 5 



History 



Conclusions 



5 



Problem and Method of Attack ...... 9 



I. Infection Experiments 



Experimental Infection of Tubers . . ... 10 



Experimental Infection of Living Plants . . . . . 12 



Summary .......... 27 



II. Ecology and Physiology of the Organisms 



1. Temperature Relations . . . . . . 27 



2. Growth Habit ......... 34 



3. The Carbon Sources of the Two Organisms .... 34 



42 



Bibliography ......... 43 



