Pesticide Residue Laboratory, Division of Soil Science & Agriculture Chemistry, Indian Institute of Horticultural Research, Hessaraghatta Lake P.O", Bangalore, 560089, India, E-mail: akahuja@iihr.emet.in.
Spray treatment of propineb (Antracol 70 WP) was given to papaya crop (variety Solo) three times at 15 days interval @ 2 and 4 g/litre during June -July, 2006 to study the persistence and residues. Initial residue deposit of 3.51 and 7.18 mg/kg of propineb was recovered from whole papaya fruit. Residues dissipated at faster rate and at harvest (30 days after the last spray) the residues were below the detectable level of 0.1 mg/kg. The residues ofboth the treatments dissipated at the half life of 4.5 days. Preharvest interval (PHI) or Waiting Period (WP) recommended were 1 and 4 days respectively for two doses. In the subsequent season of experiment September -October, 2006 with total rainfall of95.8 mm. The initial deposits ofpro pi neb (0 day) were 3.55 and 7.73 mg/kg with half life of 6.7 and 5.9 days respectively for recommended and double the recommended doses. The suggested pre-harvest intervals were 1 and 8 days for recommended and double of the recommended dose, respectively.
Papaya, propineb, persistence, residues, waiting period
