Norman Cunlipfb 



107 



The flies appeared to frequent the ears, in largest numbers, during 

 calm weather, hence the material was collected about 4 p.m., when 

 generally the wind has least velocity. 



The sweepings were made with a 12 ins. diameter net, similar to 



Fig. 1. Field of 41 acres in which sweeping was conducted showing crops carried in 1919-20. 

 Relative areas to scale. Spring oats in 1919 variety " Abundance," in 1920 '"Excelsior." 



Dates of drilling are prefixed. 



A. 2. 5. 19 Spring oats. 

 10. 3. 20 



B. 28. 3. 19 Spring oats. 



10. 3. 20 



C. 31. 3. 19 Spring oats. 



15. 5. 19 Rye grass and clover. 



D. 30. 10. 18 Winter oats. 



11. 10. 19 Winter oats. 



H, 



1919 Roots. 



1920 Winter wheat. 



20. 5. 20 Rye grass and clover. 



1919 Roots. 



4. 3. 20 Spring oats. 

 15. 11. 18 Winter oats. 



1920 Roots. 

 Lucerne and grass. 



a marine towing-net, the terminal glass tube greatly facilitating the 

 killing and transference of the material collected. Fifty semi-circular 

 sweeps were made, as far as possible of equal value, over the tops of the 

 oat plants, working up the centre of plot and keeping to the same line 

 on each occasion. When weather conditions permitted, collections were 



