156 



By the second week after treatment, house fly populations in both 

 blocks treated with CGA 72662 were reduced to zero. Population means 

 in the tilled control were significantly lower than the population means 

 in the until led control. 



By the fourth week post-treatment, house flies began to resurge in 

 the until led block treated with CGA 72662 and the larval population mean 

 was significantly higher than the population means in either control 

 block. Larval populations in the tilled CGA 72662 block remained at 

 zero. 



At the end of the fifth week, house fly resurgence had occurred 

 in all treatment blocks except the tilled CGA 72662 block (Table 34, 

 Figure 33) . 



initial H. illucens populations were much lower than the house fly 

 populations (Table 3*0- By the second week, soldier fly populations 

 were reduced to zero in blocks treated with CGA 72662 and populations 

 in both untreated controls were greater than populations in the CGA 

 72662 blocks. This situation continued through the end of the experi- 

 ment (Table 3^, Figure 3*0- 



There were no significant differences in the little house fly 

 population means at the beginning of the experiment, but by the second 

 week, populations in both CGA 72662 blocks had been reduced to zero. 

 By the third week there were no significant differences between little 

 house fly population means. This situation remained the same through 

 the end of the experiment (Table 3^, Figure 35). 



CGA 72662 added to drinking water as an oral larvicide. The test 

 concentrations of CGA 72662 utilized were 5-0, 1.5, 10.0, and 20.0 ppm. 

 The treatment and sample collection schedule is shown in Table 35. 



