256 



the exception of Atroban. Atroban was unattractive to flies in the 

 field even though laboratory tests indicated it had fly-killing ability 

 comparable to that of Golden Malrin with Muscamone. 



Atroban and Golden Malrin with Muscamone were producing mortality 

 rates of 87.5 and 100. 0% respectively after hO days of laboratory resi- 

 dual testing. Baits field-tested by Bailey et al. (1970) provided 75% 

 control for half as long. Baits for use on poultry farms do not neces- 

 sarily need long residuals. Poultrymen routinely sprinkle baits along 

 walkways in poultry houses. In the late afternoon while feed is being 

 distributed to the chickens, walks are swept by a mechanically operated 

 broom mounted beneath the feed cart. 



Wilson and Mulla (1975) observed that bait stations near the peri- 

 meters of poultry houses caught flies in nearly a one-to-one ratio and 

 that bait stations dominated by one sex had catches significantly lower 

 than those stations conducive to both sexes. Results from field testing 

 conducted at the tilling site were not always in agreement with the 

 above observations. The bait catching the most flies attracted signi- 

 ficantly greater numbers of females than males. 



The addition of Lure'em II attractant to baits resulted in fly 

 catches significantly higher than those produced by Golden Malrin with 

 Muscamone. This was not unexpected since other attractants have been 

 formulated which produce larger catches of flies than Muscamone (Mulla 

 et al ., 1977) . 



At the tilling site, flies killed by Muscamone baits were in a 2:1 

 female to male r atio instead of the 1:1 ratio reported by Carlson and 

 Beroza (1973). When Lure'em II attractant was added to baits, flies 

 killed were also in a 2:1 female to male ratio. 



