The Currant Fruit Fly. 235 



After four applications of the spray had been made, it was 

 found that many fruit flies sought shady localities in the neigh- 

 borhood of the currant and gooseberry bushes. Male and female 

 flies were found in the shade, at a distance of about 200 feet from 

 their breeding grounds. As soon as we became acquainted with 

 this habit of the pest in the field, it was decided to spray the 

 vegetation and shady places adjacent to the commercial garden. 

 Apple and poplar trees, raspberry and blackberry bushes and 

 truck crops were treated with the same formula of the poisoned 

 bait as was used on the currant and gooseberry bushes. Three 

 gallons were used in each application on June 10, 13, 17 and 22. 

 Grass, fence posts, scantlings, a wood pile, in fact, all shady 

 places wherever the trypetid was found, were sprayed on the 

 above dates with three gallons in each application of the follow- 

 ing formula : 



Molasses ^ pt. 



Sodium arsenate 1 oz. 



Water 1 gal. 



A record of the crop harvested in the commercial garden 

 in the seasons of 1909-1913, without control measures, compared 

 the yield in 1914, after spraying, is shown in table 30. It must 

 be noted, however, that two of the nine currant bushes were 

 enclosed by cages in the season of 1914, thus protecting the 

 fruit from the attacks of the pest, and hence increasing the yield 

 of the crop. This table also shows the crop harvested in 1914— 

 1915, after picking up fallen infested fruit during the two sea- 

 sons, compared with the yield in 1916, when no remedial meas- 

 ures were used. A weekly record of the gooseberry drops gath- 

 ered in the commercial garden during the seasons of 1914—1915, 

 is given in table 20. 



