1Department of Entomology, Punjab Agricultural University, Ludhiana -141004, Punjab, India
2Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana -141004, Punjab, India
3Dalhousie University, Faculty of Agriculture, NS, Canada
*Corresponding author E-mail: gurmailent@pau.edu
Online published on 30 April, 2015.
Persistence of emamectin benzoate on cauliflower by estimating the residues by high performance liquid chromatography (HPLC) equipped with photodiode array (PDA) detector is reported. The average recoveries of emamectin benzoate ranged from 91 to 102% at different fortification levels (0.05 to 0.50 mg kg−1). Four sprays each of emamectin benzoate were applied @ 8.5 and 17 g a.i. ha−1 at 10 days interval starting from fruit initiation stage. The average initial deposits on cauliflower curds were 0.22 and 0.30 mg kg−1 at the two doses respectively. The residues dissipated below determination limit of 0.05 mg kg−1 in 5 and 7 days at the recommended and double the recommended dosages, respectively. The calculated half-lives were 1.72 and 2.26 days, respectively. Soil samples, analysed 15 days after the last spray, showed residues below the determination limit.
Emamectin benzoate, cauliflower, half life, persistence, residue
