126 



There wereno significant differences in egg production due to diet 

 at the 10-ppm level (Table 21), but the birds consuming the dimilin diet 

 were laying at a numerically higher level than the other two groups. 



At the 1-ppm level, hens consuming the methoprene diet were laying 

 significantly fewer eggs than the hens in the control groups. This was 

 attributed to the hens being allowed to run out of feed as mentioned 

 above. There were no significant differences in the production levels 

 of the dimilin and control groups (Table 21), but the birds in the 

 dimilin group maintained a higher numerical production level. 



Results from the manure bioassay are shown in Table 22. At both 

 dietary IGR levels, fly mortality was significantly greater than mor- 

 tality in the control groups. At the 10-ppm level, methoprene and dimilin 

 produced fly mortalities of 85.00 and lh.\l% respectively. At 1 ppm, 

 methoprene and dimilin produced fly mortalities of only 17.5% which is 

 too low to be of any practical value. 



The data from the pupal traps were nonconcl usive (Table 23) since 

 mortality in all three groups was nonsignificant. In the control group, 

 A6.48% of the pupae failed to eclose for some unexplainabl e reason. 

 The wood chips may have become contaminated with a toxic substance 

 prior to use in the pupal traps. When Abbott's formula was used to 

 correct the mortalities, only 16.11 and 12.80% of the mortalities was 

 due to methoprene and dimilin respectively. These low mortalities 

 may have been due to the rapid breakdown of the IGR's plus the lack of 

 larval contact with the IGR's in the manure pack. 



Topical application of methoprene. Experiment 1 — The experi- 

 mental design used at the tilling site is shown in Figure 27. Blocks 2 



