64 



house k and the egg cooler (Figure 3). Traps were 1.8 m above the 

 ground and 6. i m apart. Both traps were similar in design but the one 

 near the egg processing room, trap A, was yellow and the other one, 

 trap B, was black (Figures 5 and 6). The manufacturer stated that the 

 light sources for the two traps were producing light at different wave 

 lengths, but exact values were not disclosed. 



The traps were automatically turned on along with the farm's 

 supplementary lighting system in the morning. They were in operation 

 all day and were turned off at night along with the farm's supplemental 

 lighting system. This reduced the collection of insects other than 

 those associated with the poultry farm, e.g. nocturnal moths. 



Traps were emptied weekly and the contents transported to the 

 laboratory in plastic bags. Bags were labeled and frozen until contents 

 could be analyzed. Catches were analyzed by counting selected species 

 of flies in a representative sample of each catch. Samples consisted 

 of a volume of each catch that weighed \Q% of the total catch weight. 

 The number of flies in a catch was assumed to be the number of flies 

 counted in the sample multiplied by 10. 

 Field Tests with Granular Baits 



Bait stations were fashioned from brown paper bags, 21 by 1 3 by 6 en 

 The 6-cm Up helped keep baits and dead flies from being blown from the 

 bait station by strong winds. 



When testing was done at the tilling site, bait stations were 

 placed at the sun-shade interface on the south sides of the poultry 

 houses and secured by punching a 12-penny nail through the bag and into 

 the ground. Baits were added to the bags after bags were secured. 



