Efficacy of flumethrin pour on against Haematobia exigua infesting cattle under field conditions

The efficacy of flumethrin 1% pour-on (1% w/v, Flumitas) was evaluated against Haematobia exigua on cattle farms in Namakkal district, Tamil Nadu from November 2019 to February 2020. In this study, five farms, which had fly menace, selected randomly were divided as treatment (F 1 , F 2 , F 3 and F 4 ) and control (F c ) groups. Flies collected from the farms were identified as Haematobia exigua and a mean pre-treatment intensity was 195.56 ± 14.07. In the treatment groups (F 1 ,F 2 ,F 3 and F 4 ) flumethrin 1% pour on was applied to the back of cattle at the rate of 1 ml/10 kg body weight and fly intensity was recorded for a period of 2 months. The fly intensity reduced to zero within 30 minutes of application and the same trend continued till 28 DPT in F 2 and F 3, while it was effective 35 DPT in F 1 and F 4 . A highly significant difference in the mean H. exigua fly counts between control and treatment group (P < 0.0001) was observed.