Residues of acephate and its metabolite methamidophos in/on mango fruit (Mangifera indica L.).
Mango, the major fruit crop of India is affected by stone weevil, which can cause serious damage to the fruits. Acephate gives good control of mango stone weevil. Residues of acephate and its major metabolite, methamidophos were evaluated on mango fruits following repeated spray applications at the recommended dose (0.75 kg a.i. ha⁻¹) and double the recommended dose (1.5 kg a.i. ha⁻¹). Acephate residues mostly remained on the fruit peel which persisted up to 30 days. Movement of residues to the fruit pulp was detected after 1 day of application, increased to maximum of 0.14 and 0.26 mg kg⁻¹ after 3 days and reached to below detectable level (BDL) after 20 days. Methamidophos, a metabolite of acephate, was detected from 3rd day onwards in both peel and pulp and persisted up to 15 days. The residues (acephate + methamidophos) dissipated with the half-life of 5 days in peel and pulp. A safe pre-harvest interval of 30 days is recommended for consumption of mango fruits following treatment of acephate at the recommended dose of 0.75 kg a.i. ha⁻¹.
Pesticide Residue Laboratory, Division of Soil Science and Agriculture Chemistry, Indian Institute of Horticultural Research, Hessaraghatta Lake P.O., Bangalore 560089, Karnataka, India. soudamini_mohapatra@rediffmail.com
Soudamini
S
Mohapatra
A K
AK
Ahuja
M
M
Deepa
Debi
D
Sharma
D004784:Environmental Monitoring; D007306:Insecticides / Q000032:analysis*; D031022:Mangifera / Q000737:chemistry*; D009946:Organothiophosphorus Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D063088:Phosphoramides
D007306:Insecticides; D009946:Organothiophosphorus Compounds; D010573:Pesticide Residues; D063088:Phosphoramides; C001969:acephate; C014655:methamidophos