Persistence Of Profenophos And Bifenthrin Residues In Cabbage

The experiment was conducted during Kharif 2012 with cabbage variety varun. Three sprays of Profenophos and bifenthrin were given at head formation stage. The dissipation pattern of Profenophos showed initial deposit of 2.75 mg kg-1 dissipating to below detectable residues in 15 days after third spray when profenophos was sprayed at head formation stage. The dissipation pattern of bifenthrin indicated the initial deposit of 1.21 mg kg-1 dissipated to below detectable level on 7 days after third spray of bifenthrin at head formation stage. The maximum residue limit for Profenphos and bifenthrin are 0.2 and 0.1 mg kg -1 respectively. The waiting period for safe harvest of cabbage heads after three sprays of profenophos and bifenthrin at head formation stage was four and one day respectively.