Suchi Chawla

• PhD
• Resource Person at Anand Agricultural University

Supervised field trial studies were conducted to understand dissipation kinetics and harvest time residues of a combination product of fluxapyroxad and pyraclostrobin in cumin plant/ leaves and seeds at different locations in India. The results showed initial accumulation of fluxapyroxad at the levels of 15.4 and 20.2 mg kg−1 and pyraclostrobin at...

The present study was undertaken to understand the dissipation behaviour/kinetics of fluoxapiprolin and its metabolites in cucumber and tomato under field conditions. A QuEChERS based extraction method followed by liquid chromatography coupled to mass spectrometry (LC-MS/MS) analysis showed that all method validation parameters were within the acce...

A field study to understand dissipation rates and effect of various washing treatments on the residues of seven different insecticides, i.e. tetraniliprole 200 SC, emamectin benzoate 5 SG, lufenuron 5.4 EC, indoxacarb 14.5 SC, thiodicarb 75 WP, profenofos 50 EC and cypermethrin 25 EC in/on cauliflower curd has been conducted. The results showed tha...

Combination product of two herbicides, i.e. iprovalicarb and copper oxychloride, is a new formulation. There is paucity of data on the dissipation pattern and risk assessment of this combination product in crops. To understand the dissipation behaviour/kinetics of this product, a supervised field trial was undertaken on cucumber and tomato. Method...

A multilocation study on the dissipation and harvest time residue of afidopyropen in/on brinjal and cotton showed initial residues of 6.37 and 11.27 mg kg-1 in brinjal leaf, which decreased with half-life of ~2.8 days in both the doses at Anand, Gujarat. In brinjal fruit, the residues were less than limit of determination (<LOQ) of 0.01 mg kg-1 on...

An experiment shows the reduction of pesticide residues using common household cooking techniques. The estimation of seven pesticides was performed using the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method with liquid chromatography tandem mass spectrometry (LC-MS/MS) and Gas Chromatography Tandem Mass Spectrometry (GC-MS/MS) in r...

The dissipation and residue status of a combination of fluopicolide and fosetyl aluminium (fosetyl-Al) in citrus were evaluated in an experimental field. An efficient and sensitive liquid chromatography–tandem mass spectrometry, with rapid extraction, was carried out according to the SANTE guidelines. During the method validation, the recovery was...

Supervised field trial of combination product of fluopyram + trifloxystrobin (Luna sensation 500 SC) in chilli and soil showed initial residues of fluopyram 4.0 and 12.04 mg kg-1 and trifloxystrobin 2.08 and 5.96 mg kg-1, respectively, at standard dose and double dose. Residues dissipated following first orde kinetics and were above LOQ (0.05 mg kg...

The dissipation and residue status of a combination of fluopicolide and fosetyl-aluminium (fosetyl-Al) in citrus were evaluated in an experimental field. An efficient and sensitive liquid chromatography-tandem mass spectrometry, with rapid extraction, was carried out according to the SANTE guidelines. During the method validation, the recovery was...

Fungicides have their own unique characteristics and modes of action; a combination formulation of trifloxystrobin and propineb was applied to tomatoes for their dissipation kinetics and to ensure consumer safety. The combi-product was applied at a 10-day interval with standard (61.25 + 1072.75 g a.i. ha-1 ) and double (122.5 + 2145.50 g a.i. ha-1...

Supervised field trail on dissipation of co-formulation with herbicides clodinafop-propargyl and oxyfluorfen in spring onion showed similar pattern of dissipation during two different seasons. Residues of clodinafop-propargyl reached ≤ limit of quantitation (LOQ, 0.05 mg kg⁻¹) on 3rd day after application at both standard and double dose during bot...

Supervised field trial was conducted to study persistence of a pre-emergent herbicide, ipfencarbazone (25% SC) on rice crop. Single application of two different doses, 156.25 g a.i.ha⁻¹/625 mL formulationha⁻¹ and 312.50 g a.i.ha⁻¹/1250 mL formulationha⁻¹, was applied. Method was validated to analyse ipfencarbazone in rice samples (leaf/plant, grain...

Supervised field trial on red gram for combination product of novaluron and lambda-cyhalothrin revealed initial deposits 0.55 and 0.25 mg kg−1 respectively in standard dose (85.12 g a.i. ha−1 (active ingredient per hectare)). In double dose (170.25 g a.i. ha−1) residues were 1.23 and 0.96 μg g−1 respectively. The residues reached below limit of qua...

Supervised field trials were conducted to study dissipation of combination product of beta-cyfluthrin and imidacloprid (Solomon) in various samples of lemon and onion. The pesticides were extracted and analysed using QuEChERS (with some modifications) based methods after validation of the method. Linearity, accuracy and precision data showed that t...

Dissipation and harvest time residues of carbendazim and mancozeb were studied in cotton and soybean following application of combination product (carbendazim 12% + mancozeb 63%). The residues of carbendazim and mancozeb persisited till 30th (harvest) and 50th (harvest) day in cotton leaf sample. Half-life of carbendazim in soybean was 13.1 and 16....

Field trials were conducted to study dissipation of imidacloprid and spiromesifen from vegetable and to carryout risk assessment. Method validation parameters were within the acceptable range with limit of quantitation (LOQ) of 0.05 mg kg-1 for both the pesticides. Two foliar sprays of imidacloprid (Confidor 17.8 SL) @ 20 and 40 g ai ha-1and spirom...

BACKGROUND Until now, there is no method available for analysis of pesticide residues in complex matrices like spices. Therefore, there is an urgent need to develop and validate a QuEChERS‐based method for the estimation of 104 pesticides in cumin seed. RESULTS Samples were spiked for 109 pesticides at concentrations of 0.1, 0.5 and 1.0 mg kg⁻¹. O...

Due to ever increasing population and limited natural resources use of pesticides as a major input to increase agricultural productivity is indispensible today. However, their inadequate application may produce large quantities of residues in the environment leading to environmental contamination. These residues may leach in the soil, water and eve...

Background: Afidopyropen is a recently introduced insecticide that provides effective control of insect pests in vegetable crops, including brinjal. Field applications of this insecticide can often result in accumulation of residues in brinjal fruits, leaves, and soil at harvest, which might be a concern for food and environmental safety. This dem...

A method was validated for the estimation of dithiocarbamates in soybean leaf, pod, seed, oil and in soil. Method involves acid hydrolysis and reduction of dithiocarbamates to carbon disulfide in the presence of stannous chloride and hydrochloric acid. Thiram was spiked in the samples at the levels of 0.5, 2.5 and 5.0 µg g⁻¹ and estimated as carbon...

Cotton crop is highly susceptible to attack by sucking pests. Being an important oilseed and feed crop, it is essential to monitor the pesticides and ensure health protection at consumer level. Therefore, a method was validated to estimate fipronil and flonicamid in various cotton samples and risk assessment was performed. Contamination of oil in t...

OBJECTIVES A field experiment was conducted at Agricultural Research Station for irrigated crops at Thasara, Anand Agricultural University, Anand, to study the dissipation and risk assessment of β-cyfluthrin and imidacloprid as combination product in/on chickpea. MATERIALS AND METHODS Solomon 300 OD comprising 9 per cent β-cyfluthrin and 21 per ce...

A field experiment was conducted to estimate residue persistence of fluopyram and its metabolite benzamide in cucumber fruits and soil and their risk assessment in humans and soil environment. Fluopyram (Kafka, 400 SC) was applied as soil drench twice at the interval of 15 days at the rate of 250 (standard dose) and 500 (double dose) g a.i. ha⁻¹ (a...

Unfortunately, the original publication of this paper contains a mistake. The correct name of the 3rd Author is Sunny H. Patel. The original article has been corrected.

OBJECTIVES A field experiment was conducted at Agricultural Research Station for irrigated crops at Thasara, Anand Agricultural University, Anand, to study the dissipation and risk assessment of β-cyfluthrin and imidacloprid as combination product in/on chickpea. MATERIALS AND METHODS Solomon 300 OD comprising 9 per cent β-cyfluthrin and 21 per ce...

The dissipation and residues of trifloxystrobin and tebuconazole @ 87.5+175 and 175+350 g a.i. ha−1 are reported on cowpea under field condition. After two foliar sprays at 10-day interval, cowpea pods were collected at 0 (1 h), 1, 3, 5, 7, 10, 15, 20 and 42 days (harvest). The initial deposits of trifloxystrobin were 2.27 and 4.72 mg kg−1, whereas...

The study was conducted to investigate matrix interferences using QuEChERS sample preparation to understand whether thedilution of matrix and/or the grouping of commodities can eliminate the need for selective individual matrix-matched standards in LC with tandem MS (MS/MS) analysis, and whether the calibration graph based on only one matrix can be...

Dissipation of monocrotophos applied @157.32 and 314.64 g a.i. ha-1 on castor (Ricinus communis) leaves and its subsequent levels in castor seed, oil, cake and soil at two different locations at Anand and Thasara in Gujarat, is reported. Initial deposits of monocrotophos at Anand were 24.4 and 40.3mg kg-1 the at the standard and double its dose of...

Field trials were conducted to study the difference in dissipation of the most commonly used organophosphate insecticides viz. acephate, quinalphos, chlorpyriphos and triazophos as well as a fungicide, carbendazim in/on capsicum grown in green house versus open field. Except carbendazim, all the four organophosphates dissipated at slower rate under...

A method was validated for estimating fluopyram and tebuconazole in onion on LC-MS/MS using dispersive QuEChERS. Three sprays of a combination fungicide fluopyram + tebuconazole (Luna experience, 400 SC) were applied @ 75 + 75 and 150 + 150 g a.i. ha−1 at an interval of 10 days on onion using Knapsack sprayer. First spray was made at bulb setting s...

Foliar application of a combination product of flubendiamide + thiacloprid on redgram @ 48 + 48 and 96 + 96 g a.i. ha-1 on red gram provided initial deposits of flubendiamide at 0.062 and 0.108 mg kg-1 at standard and double dose, respectively in the immature grains which reached below determination limit on the 1st day after application. At harves...

A method was developed and validated for the analysis of 87 pesticides in cotton and groundnut oil by GC with ECD and FPD detectors and LC-MS/MS. The extraction procedure based on QuEChERS followed by low-temperature freezing and dispersive cleanup steps was validated in two oil matrices for 87 pesticides of different classes. Linearity, expressed...

RESIDUES AND PERSISTENCE OF ACEPHATE, CYPERMETHRIN AND PROFENOPHOS IN/ON GREEN CHILLI SUCHI CHAWLA, K. D. DIWAN*, M. R. PATEL, H. K. PATEL, A. R. PATEL AND P. G. SHAH AINP on Pesticide Residues, ICAR Unit-9, Anand Agricultural University, Anand-388 110, Gujarat, India *E-mail: suchisood10@yahoo.co.uk To study the residues and persistence of acep...

A field experiment was conducted at Anand Agricultural University, Anand during Sept-Dec, 2009 to study the rate of degradation of flubendiamide in/on brinjal fruits following foliar application of Fame 480 SC at 90 (standard dose) and 180 (double dose) g a.i. ha( -1). The residues estimated using HPLC revealed persistence of flubendiamide in/on br...

Wheat seedling grown with their shoot bottom exposed to red light (400 micromol m(-2) s(-1)) either with constant illumination or light-dark cycles did not accumulate chlorophyll. This near-etiolation response was manifested by a critical threshold intensity of red light and did not need continuous illumination. The inhibition of the greening proce...

The present study was conducted to observe the role of the root-shoot transition zone in the development of PS I and PS II in red light. The development of PS II and PS I was severely inhibited when root-shoot transition zones of wheat seedlings were exposed to red light (670 nm) of intensity 500 micromol m(-2) s(-1). Chlorophyll biosynthesis was a...

Wheat seedlings grown in Petri dishes on germination paper with roots exposed to constant red light (300–500 μmol m⁻² s⁻¹) did not accumulate chlorophyll (Chl) in the leaves (1). In contrast, seedlings grown in Petri dishes in vermiculite with their roots shielded from red light accumulated Chl. Five-day-old etiolated seedlings grown in Petri dishe...