AO 



In an effort to determine malathion toxicity to fowl, various fowl 

 were dipped into solutions containing high concentrations of malathion. 

 A k% solution killed all birds dipped including one mature goose (Furman 

 and Weinmann, 1956). 

 Carbaryl 



in the laboratory, 25.0 and 12.5 ppm solutions of carbaryl killed 

 100% of the northern fowl mites tested (Harrison, 1961). In the field, 

 a 0.13> solution provided control for only 1 week (Hoffman, I960). Others 

 got better results with sprays of 0.25 and 0.5% (Kraemer, 1959; Furman 

 and Lee, 1969), and 2 to k% (Foulk and Matthyssee, 1963). Loomis et al. 

 (1970) got poor control on heavily infested hens with a 0.5% spray, but 

 Hall et al. (1978) found carbaryl to be the most toxic of the compounds 

 used in thei r study. 



In tests involving carbaryl dust, Foulk and Matthysse ( 1 963 ) 

 achieved good results with a 3% dust but Rodriguez and Riehl (1963) 

 got control for 22 weeks with a ]% dust. 



In studies of the systemic effects of carbaryl on laying hens, 

 single doses of carbaryl administered orally at 800 and 150 mg per kg of 

 hen could be detected in the blood for k8 to 72, and 2k hours respec- 

 tively. Five days after cessation of the smaller' dosage, no residues 

 were found in muscle, liver, fat, skin, or gizzard samples (Furman and 

 Pieper, 1962). In another study, hens were fed 200 ppm of carbaryl for 

 7 days. At 3 to 7 days post-treatment, no residues could be found in 

 muscle, liver, gizzard, skin, or eggs (McCay and Arthur, 1962). 

 Ronnel 



Laboratory and field tests have shown that ronnel is mere toxic to 

 northern fowl mites than either barthrin (a botanical) or malathion 



