Dissipation of four insecticides in tomato fruit using high performance liquid chromatography and QuEChERS methodology

Ramadan, Gomaa R.M.; Shawir, Mohamed S.; El-bakary, Ahmed S.; Abdelgaleil, Samir A. M.

doi:10.4067/s0718-58392016000100018

Cited by 14 publications

(8 citation statements)

References 21 publications

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“…Similarly, Allam and Singh (2016), Gupta et al (2005) and Pathipati et al, (2018) reported persistence of thiamethoxam residues 5 days each in brinjal, gram and capsicum. In contrast to the present results, Karmakar and Kulshrestha (2009) reported that thiamethoxam persisted for about 10 days in tomato, 15 days in paddy (Barik et al, 2010) 15 days in okra (Chauhan et al, 2013), 10 days in mango (Bhattacharjee and Dikshit, 2016), 15 days in tomato (Ramadan et al, 2016). Thus, it can be concluded that variation in the rate of dissipation is due to the several factors, including the species cultivated (its crop formation physics, cuticle characteristics, growth rate, pH dependency, etc.…”

Section: Resultscontrasting

confidence: 99%

Dissipation Kinetics and Risk Assessment of Thiamethoxam 25 % WG Residues in Vegetable Cowpea

Reddy

Paul

George

2022

ije

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A field experiment was conducted to study the rate of dissipation of thiamethoxam 25% WG in vegetable cowpea. Thiamethoxam 25%WG @ 0.24 ml l-1 was sprayed at pod formation stage, and samples of pods were harvested at 0 (2 hr after spray), 1, 3, 5, 7, 10, 15 days after spray. Residues were estimated using liquid chromatography tandem mass spectrometer (LC-MS/ MS) at the All-India Network Project on Pesticides Residues, College of Agriculture, Vellayani, Kerala. The mean initial residue was found to be 0.53 μg g-1, and residues were observed persisting up to three days and reached below quantification level on fifth day.

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Section: Resultscontrasting

confidence: 99%

Dissipation Kinetics and Risk Assessment of Thiamethoxam 25 % WG Residues in Vegetable Cowpea

Reddy

Paul

George

2022

ije

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“…Although there are no specific studies of dissipation of spinosad on mandarins reported in literature similar values of half-lives are reported for this pesticide in other vegetables and fruit. Values in the range of 3.5-3.9 day for zucchini [50], 1.7 day for tomato [51] and 1.4 day for cabbage [52] have been reported.…”

Section: Half-livesmentioning

confidence: 98%

Dissipation of Pre-Harvest Pesticides on ‘Clementine’ Mandarins after Open Field Application, and Their Persistence When Stored under Conventional Postharvest Conditions

et al. 2018

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The dissipation of field-applied difenoconazole, imidacloprid, pyraclostrobin and spinosad on Clementine mandarins (Citrus clementina Hort. ex Tan.) under controlled conditions throughout the citrus production chain was assessed. At harvest, 42 days after application, the dissipation of these pesticides were 80, 92, and 48% for difenoconazole, imidacloprid, pyraclostrobin, respectively, and spinosad was below the level of detectability. At day 28 after application, spinosad was no longer detected. The model equations that best describe the dissipation curves of these pesticides on Clementine mandarins showed different patterns. Their half-life on Clementine, calculated by the best-fitted experimental data, were 19.2 day (1st-order model) for difenoconazole, 4.1 day (Root Factor (RF) 1st-order model) for imidacloprid, 39.8 day (2nd-order model) for pyraclostrobin and 5.8 day (1st-order model) for spinosad. These results are the first record of pyraclostrobin persistence on mandarins, showing a longer half-life in this matrix than those reported for any other fruit. The treated fruit were harvested and submitted to the usual postharvest treatments: first, a hypochlorite drenching was performed; as a second step, imazalil and wax were applied, and then the mandarins were stored at 4 °C. After 32 days, cold storage caused no significant effects on the residue levels of the four pesticides compared with those determined on freshly harvested mandarins. All residues were below their Codex and European Union (EU) maximum residue limit (MRL) for mandarin since the spray application day.

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“…Similar results were reported by Ahmed and Hassanein (2005) and Barrania et al, (2012) Data of the two seasons 2019 and 2020 confirmed that abamectin persists shorter under field conditions with T50 values were 3.22, 3.62, 5.13 and 5.49 compared with chlorpyrifos-methyl that showed 10.31, 10.80, 11.23 and 11.64 day at 50%, 100%, 150% and 200% of the recommended rate, respectively (Table 3). Ramadan et al, (2016), the values of half-life of abamectin was estimated to be 4.1 days and pre-harvest interval (PHI) was 7 days. Also, Abdelfatah et al, (2020) reported that half-life of abamectin was 3.91 days and (PHI) was 10 days after the application on tomato fruits.…”

Section: Rate Of Applicationmentioning

confidence: 99%

Efficacy and Residual Effect of Abamectin and Chlorpyrifos-Methyl against the Second Larval Instar of the Cotton Leafworm, Spodoptera littoralis (BOISD.) Under Field and Semi-Field Condition

Ali

2021

Journal of Plant Protection and Pathology

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The initial mortality and residual effect of abamectin and chlorpyrifos-methyl against the second instar larvae of the leafworm, Spodoptera littoralis (Boisduval) and beneficial arthropods were evaluated on tomato crop during 2019 and 2020 growing seasons under field and semi field conditions.The obtained data were revealed that Chlorpyrifos-methyl gave 100% initial mortality one to five days in 2019 and one to three days in 2020 growing season after application when the recommended rate was used in both seasons.Also, abamectin expressed 100 and 96% initial mortality during the first 24 hr after application in 2019 and 2020 growing seasons, respectively.When the recommended rate was applied,abamectin and chlorpyrifos-methyl were completely lost their toxic residues after 7.55 and 18.39 in 2019 and7.64 and 16.77 days during 2020 growing season of field application, respectively.On the other hand, abamectin had negatively effection on the population of predators at the first day after application then the population was turned back to its normal abundance after 48hr, particularly with half of the recommended rate as well as the field rate of application in both seasons. However, chlorpyrifos-methyl was showed negative impact on the predators, which resulted 100% reduction of predators' population within 96 hr post application, and then the percentage reduction continuously increased till day 13 then it decreased starting from day 14.Therefore, it could be recommended that using abamectin for controling Lepidopterous pests on vegetables to minimize the pre-harvest interval, which makes these crops edible for human use shortly after treatment and also to preserve beneficial predators.

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Dissipation of four insecticides in tomato fruit using high performance liquid chromatography and QuEChERS methodology

Cited by 14 publications

References 21 publications

Dissipation Kinetics and Risk Assessment of Thiamethoxam 25 % WG Residues in Vegetable Cowpea

Dissipation Kinetics and Risk Assessment of Thiamethoxam 25 % WG Residues in Vegetable Cowpea

Dissipation of Pre-Harvest Pesticides on ‘Clementine’ Mandarins after Open Field Application, and Their Persistence When Stored under Conventional Postharvest Conditions

Efficacy and Residual Effect of Abamectin and Chlorpyrifos-Methyl against the Second Larval Instar of the Cotton Leafworm, Spodoptera littoralis (BOISD.) Under Field and Semi-Field Condition

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