42 



or practical value of either one is questionable. Volck, which is 

 commonly used on plant pests and is nontoxic to birds and mammals, was 

 tested as an ectoparasite control agent for farm animals (Bruce, 1928; 

 Caler, 1931). As a 5 to 10% dip, it gave 1 00% control of northern fowl 

 mites in 24 hours. Silica aerogel was used to eliminate a northern fowl 

 mite population that had infested a home via a bird's nest (Tarshis, 

 1964). 



System; cs 



Sul faqu inoxal ine alone or with other sulfonamides acts as a systemic 

 acaricide in birds infested with northern fowl mites (Beesley, 1973). 

 When feed containing 0.033% sul faqu inoxa 1 i ne was fed to layers, mite 

 populations were reduced to near zero in approximately 4 weeks (Furman 

 and Stratton, 1 96 3 ) - Feed with 0.05% sul faqui noxa 1 i ne was fed to layers 

 for 24 hours once a week and an economic control level for northern fowl 

 mites was reached in k weeks (Furman and Stratton, 1964). Out of 15 

 poultry flocks fed diets containing combinations of su 1 faqu i noxa 1 i ne , 

 sul fadimed ine , sul famerez ine , and sul fathi azole for 1.5 to 6 weeks at 

 concentrations of 0.0125 to 0.02% total sul fon imi des , 14 flocks were 

 free of northern fowl mires at the end of the test (Goldhaft, 1970). 



