PERSISTENCE OF PROPINEB RESIDUES IN PAPAYA

Abstract

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 of both the treatments dissipated at the half life of 4.5 days. Pre-harvest 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 of 95.8 mm. The initial deposits of propineb (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.