June, '15] SEVERIX-SEVERIN: KEROSENE TRAPS 333 



After third spraying Nov. 27-30, four days' catch 2 2 



After third spraying Dec. 1- 3, three days' catch 0 0 



Seven days' catch 2 2 



After fourth spraying, Dec. 4-5, two days' catch . 1 0 



After fourth sptaying, Dec. 6-10, five days' catch 25 1 



Seven days' catch 26 1 



After fifth spraying, Dec. 11-13, three days' catch . 23 0 



After fifth spraying, Dec. 14-16, three days' catch 12 1 



Six days' catch 35 1 



Thirty-five days' catch 174 8 



8 



182 Total 



Average ' ^ ^^^^^ captured per day. 



^ \ 1 female captured in about every 4 days. 



A comparison of Tables I and II shows that there were 10,239 fruit- 

 flies captured before spraying and only 182 during and after spraying, 

 a reduction, therefore, of 10,057 specimens. Of the 182 Mediterra- 

 nean fruit-flies captured during and after spraying, 93 were caught 

 during the first six days, and 89 during the following twenty-nine 

 days. After the appUcation of five sprays, it usually required a thor- 

 ough search to find an infested orange in the orchard, whereas before 

 spraying, almost every ripe orange had been stung" by the pest. 

 See plate 14. 



For a period of five weeks after December 16, no spray was applied 

 to any of the trees in the orchard where the previous work was done 

 but the ten kerosene traps were still kept wired to the same citrus 

 trees. The following table shows the number of fruit-flies taken in 

 these traps during this time: 



TABLE III 



Increase in the Number of Mediterranean Fruit-Flies Captured in Ten 

 Kerosene Traps for a Period of Five Weeks After Spraying Was Dis- 

 continued 



cf 9 



Dec. 17-20, four davs' catch 23 0 



Dec. 21-24, four davs' catch 46 0 



Dec. 25-27, three days' catch 37 0 



Dec. 28-31, four days' catch 85 0 



Jan, 1- 4, four days' catch 81 0 



Jan. 5- 8, four days' catch 70 0 



Jan. 9-12, four days' catch 92 1 



Jan. 13-17, four days' catch 97 0 



Jan. 18-21, four days' catch 134 0 



Thirty-five days' catch 665 1 



1 



666 Total 



Avprao-P / "^^^^s captured per day. 

 Average ^ ^ female captured in 30 days. 



2 



