1Department of Entomology and Apiculture, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, H.P., India
2Directorate of Extension Education, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, 173 230, H.P., India
*Corresponding author E-mail: patyalsk@yahoo.co.in
Online published on 10 November, 2011.
Persistence of bifenthrin (Brigade 8% SC) was studied on apple fruits and tree basin soil following foliar application @ 60 g a.i./ha and 120 g a.i./ha on fruit bearing trees at two locations viz. Solan and Mashobra for three consecutive years 2003–2005. The residues of bifenthrin were estimated by using Agilent 6890 N Gas Chromatograph equipped with ECD and NPD. Initial deposits of bifenthrin were in the range of 0.669–1.062 mg/kg at 60 g a.i./ha dose and 1.348–1.784 mg/kg at 120 g a.i./ha dose which reduced to half in 4.85–5.22 and 4.38–6.66 days at the respective doses. In tree basin soil, on 0 day the bifenthrin residues were 0.126–0.153 mg/kg and 0.521–1.263 mg/kg after spraying of respective doses which were reduced to 0.054–0.093 mg/kg after 30 days. Based on the Maximum Residue Limit (MRL) value of 0.5 mg/kg of bifenthrin on apple, a safe waiting period of 2.1–5.4 and 6.7–11.3 days was worked out for respective treatments.
Bifenthrin, apple, soil, persistence, residue
