Evaluation of Some Chemicals as Feed Additives to Control Face Fly Larvae1

Abstract

Dairy cattle were fed measured doses of insecticides mixed with grain. Dung collections were infested in the laboratory with newly hatched larvae of the face fly, Musca autumnalis DeGeer, and survival to the pupal stage was observed. The lowest effective daily doses tested were: coumaphos-0.25 mg/kg; Shell SD-8447 (2-chloro 1-(2,4,5-trichlorolphenyl) vinyl dimethyl phosphate) and Shell SD-8448 (2-chloro-1-(2,4,5-trichlorophenyl) vinyl diethyl phosphate)—0.5 mg/kg; General Chemical 4072 (2-chloro-1-(2,4-dichlorophenyl)vinyl diethyl phosphate)—1 mg/kg; and Imidan® (phthalimidomethyl O, O -dimetlnl phosphorodithioate)—2 mg/kg. Hooker HRS-1422 (3.5- diisopropylphenyl N -methylcarbamate), Famophos ( O-p (dimethylsulfamoyl) phenyl O, O -dimethyl phosphorolhioate), and Bayer S-940 ( N -hydroxynaphthalimide diethyl phosphate)—50% oral drench powder at 2 mg/kg were ineffective as were 2 phenothiazine formulations at 5 mg/kg and menazon at 10 mg/kg.