167 



trap A caught more soldier flies than trap B. Trap B caught greater 

 numbers of S. aalaitvans in July than trap A, but trap A caught the 

 most S. calcitrans during the other months. There were slight numerical 

 differences in catches of H. irritans , but trap A caught more than trap 

 B except during July. Except for the month of April, trap A caught more 

 Ophyra sp. than trap B. 



Cow pastures bordered the tilling site on two sides. This accounts 

 for the numbers of S. caloitvans and H. irritans caught in the traps. 



Catches of S. illucens in April, May, and June probably consisted 

 of adults that emerged from pupae formed the previous fall. Subsequent 

 catches most likely consisted of adults that emerged during April and 

 May. 



Trap catches indicate relatively high populations of Ophyra during 

 April, May, and June, but adults were never noted at the tilling site 

 except in the traps. 



House fly populations were low in April, peaked in July, and 

 dropped again in September (Figure 36). The two traps presented two 

 different views of house fly activity during the 6-month period. This 

 indicates the necessity of using traps that are uniform when using 

 trap data for survey work. The low June catch by trap B cannot be 

 explained. 

 Efficacies of Granular Fly Baits 



Laboratory and field testing were performed on granular baits pro- 

 vided by two different manufacturers. Both groups of tests will be 

 described separately. 



