151 



For the remainder of the experiment, there were no significant 

 differences between the larval populations in the block treated with 

 the lower level of CGA 72662 (0.053) at 1.92 1/9.12 m 2 and the control 

 block (Table 32, Figure 30). Populations in other blocks still being 

 monitored were reduced to zero. 



The activity period for dimethoate, dichlorvos at 1.92 1/9-12 m 2 , 

 and Ravap was 7 days (Table 33)- The activity periods for dichlorvos 

 at 3-84 1/9.12 m 2 and CGA 72662 (0.053) at 1.92 1/9.12 m 2 were 11 and 

 14 days respectively. CGA 72662 (0.05%) at 3-34 1/9.12 m 2 and both 

 rates of 0.1% CGA 72662 were still active 35 days after treatment was 

 appl i ed. 



Larvicidal activity of CGA 72662 when tilled into wet manure. 

 Manure from poultry houses at the tilling site was cleaned out leaving 

 the bottoms of the manure collection areas ca. 14 cm below the surface 

 of the walks. At this depth, the tines of the tiller were too short 

 to reach the fresh manure being dropped. This, in conjunction with 

 heavy rains and flooding, resulted in the rapid development of large 

 populations of E. illucens. 



To give consistency to the manure and to raise it to a level that 

 the tiller tines could reach, wood shavings were added to the manure 

 collection areas as previously described. The manure was tilled once, 

 leaving the surface of the manure-wood shavings mixture ca . 29 cm 

 above the surface of the walks. 



Afterward, manure was not tilled for 1 week. During this time, 

 large populations of house flies developed near the surface of the 

 manure-wood shavings mixture, along with the soldier fly populations 

 further beneath the surface (Figure 31). 



