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Theoretical dissipation models and half life values of different insecticide in/on chilli fruits
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Filed experiment was conducted at Farmers field, Village Kesali, Ta. Gandevi, Dist. Navsari during 2015 and Laboratory studies carried out at Food Quality Testing Laboratory, N. M. College of Agriculture, Navsari Agricultural University, Navsari-39 450. Following two spray of fipronil 5 SC (25 mL a.i./ha), lambda-cyhalothrin 5 EC (25 mL a.i./ha), e...
Contexts in source publication
Context 1
... residue data for fipronil, lambda-cyhalothrin, ethion, cypermethrin, fenpropathrin and fenazaquin in/on chilli fruits are presented in Table 1. Regression equations and half-life values are given in Table 2. ...Context 2
... regression equation of fipronil obtained in the present investigation by adopting the statistical model mentioned as y = -0.0258x + 1.4119 (R² = 0.98) with half life worked out was 11.67 days (Table-2). Contrary to our findings pertaining to the persistence of fipronil in chilli fruits, several studies observed a faster dissipation which is reflected from the half-life values e.g. 1.71 (Kumar et al., 2013) [4] , 4.22 (Xavier et al., 2014) [16] and 3.50 (Saini et al., 2015) [11] days in chilli. ...Context 3
... regression equation obtained as y = -0.0431x + 1.5401 (R² = 0.92) with half-life period worked out for lambda-cyhalothrin at recommended dose was 6.98 days (Table-2). The dissipation half-life obtained in the present study is more or less similar to the finding of earlier studies viz., 3.4 days (Mohapatra et al., 2006) and 2.92 days (Singh et al., 2007). ...Context 4
... regression equation of ethion was fitted as y = -0.0642x +1.2774 by giving 0.9656 as R² with half life period for this insecticide was 4.68 days (Table-2). While other workers had reported a rapid degradation of ethion in several crops. ...Context 5
... regression equation for cypermethrin was fitted as y = -0.1162x + 1.7591 (R² = 0.98) with a half life period of 2.6 days (Table-2). Likewise, many workers have reported the half life (t 1/2 ) of 3.3, 2.59 and 1.98 days which is in agreement of present investigation (Deen et al., 2009;Parmar et al., 2012 andKumar et al., 2013) [3,6,4] , respectively. ...Context 6
... regression equation for fenpropathrin was fitted as y = -0.0397x + 2.2241 (R² = 0.9772) with a half life period of 8.14 days (Table-2). Similar findings were also reported by Romeh and Hendawi (2013a) [10] where residues of fenpropathrin were below the detection limit on 15 th days after application. ...Similar publications
The dissipation patterns of acephate in green chilli fruits were studied after application of acephate at fruiting stage at recommended doses (RD) and double the recommended doses (DRD). Acephate was applied at the rate of 337.5 g a.i/ha and 675 g a.i/ha on chilli fruits and the fruit samples were collected at the 0, 1st, 3rd, 5th, 7th, 10th, 15th,...
Citations
... The discrepancy in the findings is attributed to the fact that when pesticides are applied in protected conditions, they settle on the plant surface without being scattered by the wind, resulting in minimal volatilization loss during or shortly after application . The results from a trial conducted on chilli, a Solanaceous crop, demonstrated that the application of ethion (444 g a.i/ha), fenpropathrin (150 g a.i/ha), and fenazaquin (50 g a.i/ ha) onto chilli fruits led to initial deposits measuring 0.20 µg/g, 1.58 µg/g, and 2.33 µg/g, respectively (Patil et al., 2019). Aggarwal et al. (2023) investigated the initial residue (0.74 mg/L and 1.79 mg/L) concentrations of fenazaquin on chili crops, utilizing application rates of 125 and 250 g a.i. ...
Bell peppers, a globally significant crop, face infestations from various pests. In a study, bell peppers were treated with deltamethrin, ethion, fenazaquin, and fenpropathrin at recommended and double the doses, repeated twice with a 10-day interval. The QuEChERS method underwent validation for linearity, matrix match, accuracy, and precision in bell pepper matrices for residue analysis. The limit of detection for the tested pesticides on bell peppers was 0.01 mg/L, with a quantification limit of 0.05 mg/L. Recovery studies showed a range of 94.80% to 102.80%. Initial deposits of deltamethrin, ethion, fenazaquin, and fenpropathrin on bell peppers at recommended doses were 0.371, 1.237, 0.617, and 0.640 mg/L, respectively, and at double doses were 0.712, 1.945, 1.221, and 1.189 mg/L, respectively. Safe waiting periods of 10, 11, 10, and 8 days were suggested for deltamethrin, ethion, fenazaquin, and fenpropathrin, respectively. The corresponding half-lives for the pesticides were 1.96, 1.79, 2.06, and 1.69 days, all following first-order dissipation kinetics. Dietary risk assessment indicated Hazard Quotients (HQ) below 1 and Theoretical Maximum Daily Intake (TMDI) below Acceptable Daily Intake (ADI) and Maximum Permissible Intake (MPI) levels. Therefore, at their recommended doses, the pesticides were deemed safe for bell pepper cultivation.
... Samples collected after 5 days showed residue less than the quantitative limit of 0.05 mg/ kg ( Table 2). The present results are different from the observation made by Patil et al. (2019) who investigated an initial deposits of 1.58 mg/ kg fenpropathrin residues on chilli and half-life 8.14 days following application of fenpropathrin 30 EC @ 150 g a.i./ ha. This might be due to different climatic conditions, spray patterns, etc. ...
Spraying of chilli crop with fenpropathrin @ 75 and 150 g a.i./ ha led to the initial residues ranging from 0.12 to 0.14 and 0.19 to 0.22 mg/kg, respectively. Fenpropathrin residues in chilli dissipated below the limit of quantification after 3 and 5 days at low and high doses. The half-life of fenpropathrin in chilli was calculated to be 2.41 and 1.92 days. Residues of fenpropathrin on chilli collected 0 day after spray was below MRL following application @ 75 g a.i./ ha. Among various household processing methods, KMnO4 solution reduces 72.50 per cent residue washing, boiling, dipping in sodium bicarbonate solution, salt solution and acetic acid solution, respectively after 0 (2 hrs after spray) day of fenpropathrin @ 75 g a.i./ ha after third spraying in chilli. Bangladesh J. Bot. 52(3): 715-722, 2023 (September)
... The residues persisted till 20 and 30 days for the single and double doses, respectively. Patil et al. (2019) studied the dissipation of various insecticides in chilli after application of fipronil 5 SC @ 25 mL a.i. ha −1 , λ-cyhalothrin 5 EC @ 25 mL a.i. ...
... The half-life values of fenazaquin residues on tomato were found to be 2.4 days after application of fenazaquin 20 SC @ 300 mL (Nasr et al. 2009). However, Patil et al. (2019) estimated the half-life of fenazaquin on green chilli to be 6.57 days following the application of fenazaquin @ 50 g a.i. ...
Dissipation and persistence of fenazaquin residues in chilli and soil were studied for 2 years following two applications of fenazaquin at 10-day interval. The limit of detection and limit of quantification were 0.003 and 0.01 mg kg⁻¹. The mean initial deposits of fenazaquin 10 EC on green chilli fruits were found to be 0.74, 1.17, and 1.79 mg kg⁻¹ after the application @ 125 (X dose), 156.25 (1.25X dose), and 250 (2X dose) g a.i. ha⁻¹, respectively, during the first year followed by 0.78, 1.20, and 1.70 mg kg⁻¹, respectively, during the next year. The mean initial deposits in soil were found to be 0.18, 0.25, and 0.44 mg kg⁻¹ for the X, 1.25X, and 2X doses, respectively, during the first year and 0.19, 0.22, and 0.39 mg kg⁻¹, respectively, during second year. The residues of fenazaquin in green chilli dissipated above 96% at 20 days in the three different doses whereas in red chilli, the residues were present on 25 days and at maturity, residues were below the limit of quantification (LOQ). In soil, the residues dissipated below the LOQ at 15 days for X and 1.25X while 20 days for the 2X dose, respectively. The half-life values in green chilli fruits and soil for the fenazaquin were found to be in the range of 3.22–3.93 days and 2.41–3.35 days, respectively. The waiting period was calculated to be 3, 5, and 8 days for green chilli after the application of fenazaquin at 25, 156.25, and 250 g a.i. ha⁻¹, respectively.
... To understand the fate of pesticides in the environment, the dissipation of pesticides in different climatic conditions must be studied. Therefore, Singh et al. [17] conducted a field trial in Village Kesali, Dist. Navsari to evaluate the dissipation behavior of fipronil, lambda-cyhalothrin, ethion, cypermethrin, Fenpropathrin, and fenazaquin in chilli crop. ...
Since the 1990s, the insect growth regulator pyriproxyfen and pyrethroids such as fenpropathrin have been widely used to reduce pest populations in agriculture. The widespread use of these insecticides makes it essential for researchers to understand how they behave in terrestrial ecosystems and how they can be detected. This work reviewed the most effective analytical techniques used to detect pyriproxyfen and fenpropathrin in various samples. The degradation of pyriproxyfen and fenpropathrin in soil takes time, but in aerobic environments, pyriproxyfen and fenpropathrin are degraded rapidly following first-order kinetics or pseudo-first-order kinetics. Both insecticides tend to adsorb on soils and are not susceptible to leaching into groundwater. Based on greenhouse or field conditions, both insecticides degrade differently by following first-order kinetics, and their half-lives in plants range from one to three weeks. Since both insecticide residues are soluble in acetone, hexane, ethyl acetate, and acetonitrile, they can be extracted in those solvents. They can also be processed in a variety of ways discussed in this paper. Ultimately, the review explains how fate profiles of pyriproxyfen and fenpropathrin in soil and plants affect these molecules' adverse effects on non-target organisms.
... Barik et al (2010) studied the dissipation of thiamethoxam+ lambda cyhalothrin and observed that the residues of thiamethoxam persisted for >15 days and lambda cyhalothrin up to 5 days in paddy. Several individual insecticide studies were reported where, thiamethoxam persisted up to 5 days, contrasting with the present results that thiamethoxam persisted about 15 days in okra (Chauhan et al., 2013); and lambda cyhalothrin persisted up to 15 days in okra (Singh et al., 2007), 15 days in chilli (Patil et al., 2019), 15 days in tomato (Karmakar and Kulshrestha, 2009), and 10 days in cowpea (Soliman, 2011). Dissipation of any compound depends on various factors including plant matrix, chemical formulation, agroclimatic conditions, physical phenomenon, application method and chemical degradation in which sunlight place an important role (Bhattacharya et al., 2017). ...
A field experiment was conducted to study the rate of dissipation of insecticide mixture (thiamethoxam 12.6%+ lambda cyhalothrin 9.5%ZC) in vegetable cowpea. The insecticide mixture @ 0.30 ml l-1 was sprayed at pod formation stage, and samples of pods were harvested at 0 (2 hr after spray), and 1, 3, 5, 7, 10, 15 days after spray. The residues were estimated using liquid chromatography tandem mass spectrometer (LC MS/ MS) and GC-ECD at the All India Network Project on Pesticides Residues, College of Agriculture, Vellayani, Kerala. The residues of thiamethoxam and lambda cyhalothrin were found to be 0.12 and 0.21 µg g-1 , respectively. Residues were observed to persist up to three days, and were below detectable level on the fifth day.
