Plant Uptake and Residual Patterns of Insecticide Dinotefuran by Radish

Kwak, Se-Yeon; Hwang, Jeong-In; Lee, Sang-Hyeob; Kang, Minsu; Ryu, Jun-Sang; Kang, Ja-Gun; Hong, Sung-Hyeon; You, Oh-Jong; Kim, Jang-Eok

doi:10.7585/kjps.2017.21.3.233

Cited by 7 publications

(1 citation statement)

References 13 publications

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“…The uptake of total soil-residual dinotefuran by lettuce has recently demonstrated that about a 24–28% level of initial concentration was translocated into leaves 30 and 60 days after treatment [ 38 ]. This high uptake ratio was explained by high water solubility and lower sorption to soil organics [ 39 , 40 ]. Thus, the evaluation of soil-residual pesticide in leaf vegetables is important for pesticide safety in agricultural products.…”

Section: Discussionmentioning

confidence: 99%

Uptake of Soil-Residual Diazinon by Rotational Lettuce under Greenhouse Conditions

Yoon

Lim

Lee

et al. 2022

Foods

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Pesticide residue is an increasing concern in rotational crop practices. The pesticide used for the primary crop may re-enter the secondary crop, thus exceeding pesticide levels set by the positive list system (PLS). As such, evaluation of pesticide residue translocated into rotational crops is required for ensuring pesticide safety. In this study, we investigated the residue pattern of diazinon translocated into lettuce as a typical rotational crop in Korea. Diazinon was used to treat greenhouse soil at the maximum annual application rate before crop planting. Diazinon residues in soil and lettuce were investigated using liquid chromatography/tandem mass spectroscopy and a modified quick, easy, cheap, effective, rugged, safe (QuEChERS) method. The limit of quantitation (LOQ) of diazinon was found as 0.005 mg/kg for the plant and soil samples. The recovery of diazinon at the LOQ and 10× the LOQ ranged from 100.2% to 108.7%. The matrix calibration curve showed linearity, with R2 values > 0.998. Diazinon residue in soil dissipated over time after the initial treatment, generating first-order kinetics (R2 = 0.9534) and having a half-life of about 22 days. The uptake ratio (UTR) of diazinon from the soil to the plant ranged from 0.002 to 0.026 over the harvest period. Considering the UTRs, diazinon residue in the edible leaf could exceed the PLS level (0.01 mg/kg) if lettuce is rotated in soil containing >0.357 mg/kg of diazinon. Based on our findings, to comply with the PLS, a 3-month plant-back interval is required following diazinon treatment and/or setting the maximum residue limit of diazinon for lettuce.

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Section: Discussionmentioning

confidence: 99%

Uptake of Soil-Residual Diazinon by Rotational Lettuce under Greenhouse Conditions

Yoon

Lim

Lee

et al. 2022

Foods

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Residues and Uptake of Soil-Applied Dinotefuran by Lettuce (Lactuca sativa L.) and Celery (Apium graveolens L.)

Ham

Choi

et al. 2022

Agriculture

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Pesticides have been used for decades to protect agricultural products and increase productivity by controlling crop pests. However, the frequent application of pesticides on crops or soil leads to the accumulation of their residues in the environment, which will be subsequently absorbed by plants and finally translocated to edible parts. This study aimed to investigate the uptake of soil-applied dinotefuran and three major metabolites by lettuce and celery from the previous season’s applications and analyze their residues in soil and consumable parts. Dinotefuran was soil-applied at plant back intervals of 30 and 60 days (PBI-30 and PBI-60). Residues of dinotefuran and its metabolites in 50% and 100% mature lettuce leaves and celery shoots, soil after application, at planting, and at 50% and 100% plant maturity were estimated. Half-lives and bio-concentration factors were calculated. The uptake of dinotefuran by lettuce and celery ranged between 23.8% and 28% and between 51.73% and 53.06%, respectively. Respective half-lives (days) of dinotefuran applied on PBI-30 and PBI-60 were 1.33–1.54 and 0.91–2.16 in lettuce soil and 0.9–1.47 and 0.79–1.65 in celery soil. Residues were below Korean MRLs in PBI-60 and most PBI-30 samples. The calculated risk assessment parameters indicated that negligible risk could be expected. The current study recommends growing the next crop 60 days after harvesting the first crop, but not less than 30 days.

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