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Residue evaluation of imidacloprid, spirotetramat and spirotetramat-enol on grapes (Vitis vinifera L) and soil.

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Title Residue evaluation of imidacloprid, spirotetramat and spirotetramat-enol on grapes (Vitis vinifera L) and soil.
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Creator Mohapatra, S. Sampath Kumar and G.S. Prakash
 
Subject Grape; Imidacloprid; Pre-harvest interval (PHI); Spirotetramat; Spirotetramat-enol
 
Description Not Available
A combination of imidacloprid and spirotetramat effectively controls sucking pests on grapevines. Residues of these insecticides on grapes were evaluated after treatment with spirotetramat 12% + imidacloprid 12% (240 SC) three times at 90 and 180 g a.i. ha(-1). The samples were extracted and purified by QuEChERS method and analyzed by high-performance liquid chromatography with a photodiode array detector (imidacloprid) and gas chromatography mass spectrometry (spirotetramat and its metabolite spirotetramat-enol). Satisfactory results were obtained with ranges of 80.6-98.6% for the recovery, 3.1-10% for the relative standard deviation range, and 9.8-15.6% for the uncertainty. The limits of detection and quantification were 0.015 μg mL(-1) and 0.05 mg kg(-1), respectively. Initial residue concentrations of imidacloprid after the 90 and 180 g a.i. ha(-1) treatments were 0.912 (half-life 11 days) and 1.681 mg kg(-1) (half-life 12.4 days), respectively. For spirotetramat + spirotetramat-enol, the residue concentrations were 1.337 (half-life 5.6 days) and 2.0 mg kg(-1) (half-life 7.6 days) for the 90 and 180 g a.i. ha(-1) treatments, respectively. Spirotetramat degraded faster than spirotetramat-enol. After treatment at 90 g a.i. ha(-1), the initial residues of both insecticides were within European Union maximum residue limits and a 1-day pre-harvest interval (PHI) was adequate for safe consumption of grapes. After treatment at 180 g a.i. ha(-1), the required PHI was 7 day. Therefore, a PHI of 7 day should be used after treatment with imidacloprid and spirotetramat.
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Date 2019-03-19T03:31:34Z
2019-03-19T03:31:34Z
2015-09-17
 
Type Journal
 
Identifier 7
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http://krishi.icar.gov.in/jspui/handle/123456789/17393
 
Language English
 
Relation Not Available;
 
Publisher Springer