PERSISTENCE OF ABAMECTIN RESIDUES IN/ON BRINJAL (Solanum melongena)

Abstract

Spray application of abamectin (CHA 2062) was given twice to brinjal crop at 15 days interval at the recommended dose and double the recommended dose of 14.4 and 28.8 g a.i./ha during December, 2007- March, 2008 to study its residue persistence. Initial residues of abamectin on brinjal from the two treatments were 0.202 and 0.815 mg/ kg, respectively. The residues persisted for 3 days from both the treatments and reached below the quantifiable limit of 0.01 mg/kg on the 5th
 day. Residues of abamectin on brinjal dissipated with the half-life of less than 1 day and the pre-harvest interval (PHI) or the time taken for the residues on brinjal to reach the permissible level of 0.02 mg/kg was 3 days. Field soil analyzed 10 days after the last treatment was free from abamectin residues.