169 



Farnam baits. The following baits were submitted by Farnam: 



Kill "em Fly Killer II (Bomyl) - sand base 

 Kill 'em Fly Bait (Bomyl) - corn cob base 

 Kill "em Fly Killer (Vapona + ronnel) 

 SX-70 Fly Bait (methomyl) 



Baits were subjected to knockdown and residual tests. The amount of 



each bait used was 5 g. 



Knockdown test. Results are shown in Table 41 . Kill 'em Fly Killer 

 had the fastest knockdown, killing all flies in lOmin. Kill 1 em Fly Bait 

 killed all fiies within 1 hr and kO min, and SX-70 Fly Bait and Kill 'em 

 Fly Killer li killed all flies in k hr and kO min, and k hr and 50 min 

 respect ivel y . 



Residual test. Results are shown in Table 42. By the 10th day of 

 testing, all baits had picked up moisture from the air. SX-70 Fly Bait 

 had the longest residual, still producing a mortality rate of greater 

 than 25% after a 6-week testing period. Testing of Kill'em Fly Killer 

 ceased on day 10 after the mortality rate dropped to 20% and testing of 

 Kill'em Fly Killer il and Kill'em Fly Bait ceased on day 19 after mor- 

 tality rates dropped to 30 and 10% respectively. 



Although testing was discontinued on one bait on day 10 and two 

 baits on day 19, these baits were maintained through the end of the 

 experiment. As a check, flies were exposed to the discontinued baits 

 once every week. Mortality never reached the last recorded values in 

 Table hi and continued to drop with time. 



The sudden fluctuation in mortality rates produced by SX-70 Fly 

 Bait during days 15 through 33 is unexpla inabl e. Equally unexpl a i nabl e 

 is the 22.5% control mortality on day 12. 



