258 



After flies had been exposed to the panels for ca. 15 min, they 

 exhibited signs of incoordination and other characteristic symptomology 

 described by Wouters and van den Bercken (1978). Had they not been caged, 

 the spasmodic wing fluttering prior to death could have carried flies 

 far from the panels' surfaces and thus given the impression that the 

 panels were not efficacious. This may have been what was actually 

 occurring in the field since dead flies were never seen near the panels. 



The synthetic pyrethroid compounds probably persisted at toxic 

 levels for more than 121 days in the field. Breakdown was attributed 

 to the disinfectants used to clean the poultry houses during between- 

 flock sanitation procedures. Once approved for use, synthetic pyrethroids 

 applied to rafters prior to the arrival of a new flock of chickens 

 should provide adequate fly control for as long as the flock is housed. 



Long term contact residuals like the synthetic pyrethroids would be 

 a good addition to any fly control program. If applied between flocks 

 as suggested above, hens, eggs, feed, and water would not be contami- 

 nated. The pyrethroids could be applied very thoroughly since the 

 poultryman would not be concerned with other activities such as daily 

 flock management. Fly resistance would be of foremost concern. Shono 

 et al. (1978) stated that ease of permethrin detoxification by insects 

 may limit i ts use. 



Susceptibility of Endemic Florida Strains of Norther Fowl Mites 

 to Carbaryl , Malathion, Ravap, and Synthetic Pyrethroids 



Laboratory testing showed that the LC 's for SO 43775, SBP-1382, 



BW 21Z, and Ectiban were higher than those of carbaryl and malathion. 



Hall et al. (1978) had similar results exceDt their LC 's for carbaryl 



and permethrin, and malathion were greater than mine by approximate 



