Norman Cunlippe 



121 



Synopsis II. 

 Series I. 



Infection light. Seeds sown 11. 7. 19. Plants infected on 23. 7. 19 wlien plants 3-5 inches in height. 

 No food supplied. Experiments continued through winter of 1919, no flies being removed from cages. 

 Periods reckoned in days after date of infection. 



Control experiment for Series I. 

 30. 7. 19. (J and $ (emerged from piiparia from oat grains) were placed 

 on clean oat panicles and provided with moisture only. Parents dead 

 after 5 days. 



Result: The first and last flies emerged after 27 and 35 days respec- 

 tively, the average period being 31 days (five flies, two cJ and three $). 

 (By an oversight these flies were not suppMed with moisture and died 

 without reproducing.) 



Series II. 



Infection heavy, no food supplied. 



Emergence reckoned 

 in days after infection 



Remarks 

 Sown 15. 7. 19. 

 Infected 21. 8. 19. 

 1st sign of attack 

 after 22 days 

 Sown 28. 7. 19. 

 Infected 23. 8. 19. 

 1st sign of attack 

 after 27 days 

 1 fly after Sown 28. 7. 19. 



263 days Infected 19. 8. 19 



^ These flies failed to reproduce themselves on the same host plants in the summer 

 of 1920. 



1920 

 6 flies between 

 252-253 daysi 



I fly after 

 251 days 



