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EVALUATION OF COMBINATION MIX (BETA-CYFLUTHRIN + IMIDACLOPRID) ON TOMATO: RESIDUES AND FOOD SAFETY

KrishiKosh

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Title EVALUATION OF COMBINATION MIX (BETA-CYFLUTHRIN + IMIDACLOPRID) ON TOMATO: RESIDUES AND FOOD SAFETY
 
Creator DHARUMARAJAN S
 
Contributor A.K. Dikshit
 
Subject vegetables, pesticides, extraction, insecticides, fruits, sampling, organic compounds, solvents, crops, silica
 
Description t-8038
Field and laboratory experiments were carried out to evaluate the persistence, dissipation of combination mix (beta-cyfluthrin
+ imidacloprid) on tomato (Lycopersicon esculentum). Besides, the theoretical dissipation models were developed and predicted data
compared with the observed data. The permissible intake (MPI) were calculated and compared with Theoretical Maximum Residue
Contribution (TMRC), Theoretical Maximum Daily Intake (TMDI) and per cent Acceptance Daily Intake (% ADI) to find the safety
assurance. Decontamination with simple culinary process was performed to see how much insecticides can be dislodged from
contaminated samples.
Tomato crop was grown at the experimental farm of Indian Agricultural Research Institute (IARI), New Delhi. Beta-cyfluthrin
@ 18.75 g a.i.ha-1, imidacloprid @ 20 g a.i. ha-1, combination mix (beta-cyfluthrin + imidacloprid) @ 40 g a.i. ha-1 and 80 g a.i. ha-1
was sprayed separately on tomato at 50 per cent fruiting stage of the crop.
The initial deposit of beta-cyfluthrin ranged from 0.992 mg kg-1 to 2.133 mg kg-1 from all the treatments. The results of
persistence studies showed that beta-cyfluthrin was detectable only up to 7 – 10 days after application from beta-cyfluthrin alone
formulation, but it persisted up to 15 days from lower and higher rate of application from combination mix. This shows little higher
persistence from combination mix treatment. The half life values of beta-cyfluthrin residues ranged from 2.03 to 2.69 days.
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The initial deposit of imidacloprid on tomato ranged from 1.333 mg kg-1 to 2.383 mg kg-1 from all the treatments. The half life
values of imidacloprid residues from tomato were 1.94 to 2.71 days from all the treatments.
On the basis of MRL value of beta-cyfluthrin on tomato (as per the study as well as suggested value of Codex) as 0.5 mg kg-1,
and the recommended dietary intake of 200 g of tomato, the TMDI was found to be 0.1 mg person-1 day-1 and the % ADI calculated to
be 10. Similarly considering MRL of 0.5 mg kg-1 for imidacloprid on tomato (as per this study and Codex) and recommended
consumption of tomato (200 g), the TMDI value was found to be 0.1 mg person-1day-1 which corresponded to % ADI of 3.33. This
clearly shows that beta-cyfluthrin and imidacloprid will not pose any undue hazard for tomato.
Washing of zero day contaminated tomato fruit samples with tap water dislodged beta-cyfluthrin 38.59-41.44 per cent from all
the treatments. Washing and steaming of zero day contaminated fruit samples dislodged beta-cyfluthrin 62.69 – 65.58 per cent from
all the treatments. Hence, washing of contaminated fruits followed by steaming was best method for reducing the residues from
contaminated tomato fruits and ensured further margin of safety. Washing followed by steaming dislodged the residues to the extent of
62.67-66.22 per cent from all the treatments/ formulations.
On the basis of residue data obtained, and considering the ADI, RDI (recommended dietary intake), the MRL of 0.5 mg kg-1 of
both the insecticides is proposed for tomato and a PHI (pre harvest interval) of 3 days. Hence, combination mix (beta-cyfluthrin +
imidacloprid, 1:1) can be recommended for plant protection practices without risk to health and environmental contamination.
 
Date 2017-01-04T09:09:42Z
2017-01-04T09:09:42Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/94286
 
Format application/pdf