137 



Resu] ts. Results are summarized in Table 27 and the raw data are 

 in Appendix 2. At the concentrations tested, CGA 72662 produced 100% 

 larval mortality in all flies except H. iltucens and F. oanievClavLs } 

 and 1 00% pupal mortality in H. illucens . Flies other than H. illuaens 

 and F. cani-cularis produced no pupae. No larval remains could be found 

 in the growth media which indicates early larval death. 



Concentrations of CGA 72662 were within the range of concentrations 

 to be used in the field. Under field conditions, concentrations may 

 become diluted after being applied to fresh poultry manure. Therefore, 

 the concentrations of CGA 72662 used in this experiment were much higher 

 than field populations of flies would be likely to encounter. 



Larval house fly dosage-mortality curve for CGA 72662. The test 

 concentrations of CGA 72662 added to house fly larval diets in this 

 experiment were 1.0, 0.75, 0.50, 0.25, and 0.10 ppm. The diet used is 

 shown in Table 26. 



Resul ts. The resulting mortality data are shown in Table 23. Two 

 trials were performed and data were combined. In one trial, the number 

 of larviform pupae found at different concentrations of CGA 72662 was 

 recorded (Table 28). The lowest concentration producing larviform 

 pupae was 0.25 ppm. All larviform pupae formed at this concentration 

 eclosed. Those produced at higher concentrations did not eclose. At 

 the highest concentration of CGA 72662, 1.0 ppm, only five uneclosed 

 larviform pupae formed in the four treatment replications. It was 

 therefore assumed that other larvae at this and higher concentrations 

 died prior to reaching the pupal stage. 



A larviform pupa formed during the experiment is shown in Figure 28. 

 Larviform pupae were comparable in size to third-instar larvae and 

 slightly darker in color than normally-formed pupae. 



