Parasitism in the Erysiphaceae. "05 



spores from B. tectorum. 



Rem ar k s. 



25a. Aug. 31. A small fleck of mycelium on 1 Jeaf. Sept. 2. The in- 

 fected leaf with a powdery mass of spores; — controls free. Sept. 5. 

 The 2 leaves infected. 



38 a. Sept. 2. Infection visible on 3 of the iuoculated leaves. Sept. 4, 



5 of the inoculated leaves bearing powdery masses of spores. Sept. 5. 



6 leaves the same. 



25 b. Aug. 31. A patch of mycelium with young conidiophores on 1 inoc- 

 ulated leaf. Sept. 5. Oidiutn still persisting with spores on the 1 

 leaf; controls all free. 



38 b. Sept. 4. All the inoculated leaves with flecks of mycelium and a 

 few conidiophores; controls free. Sept. 8. The infected leaves with 

 more or less powdery masses of spores. 



74 a. Sept. 18. Scattered conidiophores on 2 of the inoculated leaves. 

 Sept 22. A few small groups of conidiophores on both of the inoc- 

 ulated leaves. 



spores from B. arvensis. 



Remark s. 



39 a, 39b. Sept. 2. Flecks of mycelium on some of the inoculated leaves 

 Sept. 3. Patches of mycelium and young conidiophores on 7 of the 

 inoculated leaves. Sept. 5. All of the 8 leaves bearing powdery masses 

 of spores. 



spores from B. racemosus. 



Rem arks 



9 a. Aug. 13. 3 of the inoculated leaves with small flecks of mycelium 

 bearing a few conidiophores. Aug. 19. Infected leaves with pow- 

 dery masses of spores; — controls free. 



9 b. Aug. 13. 2 of the inoculated leaves with flecks of mycelium and a 

 few conidiophores. Aug. 19. The Infected leaves with powdery masses 

 of spores; — controls free. 



