21 



treatments (Bailey et al., 1971^)- Dichlorvos is also toxic to predaceous 



mites (Axtel 1 , 1966) . 



TM 

 Rabon , when applied to poultry manure as a larvicide, controlled 



flies for 1 (Bailey et al., 1968) to 2 weeks (Matthyssee and McClain, 



1973). Rabon was also fed to dairy cows as an oral larvicide (Miller 



et al., 1970), but it proved to be ineffective in commercial operations 



(Mi 1 ler and Pickens, 1975) . 



Th iocarbamide or thiourea, when applied weekly to manure at a rate 

 of 0.2.6 g per bird in 152.0 1 of water, achieved between 68 and 3k% 

 control of fly larvae (Jaynes and Vandepopul iere , 1978). Thiourea, as 

 a larvicide, affects first-instar larvae more than second- instar larvae, 

 and second- instar larvae more than third-instar larvae. Fly eggs and 

 pupae are not affected (Hall et al., 1979). 

 Methods for Adult House Fly Control in Poultry Houses 

 Light traps 



Ultraviolet light between 3300 and 3700 angstroms is effective for 

 attracting flies (Tarry et al., 1971). Claims of good control of flies 

 with light traps, however, are sometimes the results of tests performed 

 with small fly populations (Tarry, 1968), or in ideal situations (Tarry 

 et al., 1371). Schreck et al. (1975) limited light trap catches to 

 Stomoxys oalcitvans by using C0„ as an additional attractant. Traps 

 tested by Morgan et al. (1970) averaged 439-1 house flies per day over a 

 22-day period. Pickens et al. (1975) increased the house fly catch 

 l.k times by placing a heated fly bait in the trap. 



Trap height influences fly catches. Pickens et al. (1975) found 

 that lowering traps from ceiling level to 0.5 m above the ground 



