Of late, considering the constant usage of pesticides and to monitor the residues in the final produce, a well equipped test facility was established at UPASI TRI in 1994. The pesticide residue laboratory is accredited by National Accreditation Board for testing and calibration Laboratories (NABL) and certified to carry out the tests in line with the standard ISO 17025 in the year 2003. Mandate of the division is to carry out research on pesticide residues, development and validation of methodologies for quantifying the residues of new pesticide molecules and quantification of heavy metals in tea. Analytical services include quantification of heavy metals and residues of the commonly used pesticides in fresh green leaves, dried green leaves, infusion, soil and black tea and active ingredient analysis of commercial formulations. Periodical surveys are being conducted in tea districts of south India to monitor and document the residue levels of pesticides in black tea. Quantification of residues of ethion, dicofol, quinalphos, chlorpyrifos, fenpropathrin, fenvalerate, lambda-cyhalothrin, beta-cyfluthrin, propargite, endosulfan, fenpyroximate and hexythiazox were endorsed by NABL besides certain heavy metals like copper, chromium, nickel, zinc, cadmium, lead and arsenic. Atomic Absorption Spectrometer equipped with flame, furnace and hydride generator is used for quantifying the heavy metals in tea and in agro inputs. Gas Chromatograph with flame ionization detector (FID)coupled with head space, nitrogen phosphorus detector (NPD) and electron capture detector (ECD) with auto sampler & mass spectrum (MS) detector and High Performance Liquid Chromatograph equipped with diode array detector (DAD), UV detector and fluorescence detector (FLD) are used for the quantification of pesticide residues.
As mentioned earlier, the laboratory is being involved in the quantification and documentation of pesticide residues in black tea. From time to time, field experiments (wet and dry season trials) were also conducted to assess residue levels of new molecules and to document the dissipation pattern of foliar applied pesticides. Based on the results on residues, safe harvest intervals are calculated for commonly used pesticides and the data were used to establish their MRLs in processed teas. Basket surveys are being conducted at periodic intervals in different tea districts of south India to determine the level of residues of the commonly used pesticides in processed tea. Surveys showed the presence of pesticide residues in certain surveyed samples. However, residue levels in all the samples were well below the MRL prescribed by the PFA/CODEX/EU/EPA.
Impact of repeated application of identical active ingredient on pesticide residue, herbicide residue in black tea, growth rate on dilution of repeated application of fungicides and increasing dosage of fungicides were also documented which throw more light on residues in black tea.
Pesticide laboratory is conscious in evolving safety aspects of pesticides/insecticides with particular reference to environmental pollution. Core data generated on residues in black tea, soil and water analyses during the course of experiment were serve as an authentic document to get clearance from Central Insecticide Board. Submission of the generated residue data to the international and national bodies like CODEX, PFA is useful to fix MRL and safe harvest interval in tea. As an integral part of the activity, division executed sponsored trials and projects approved by the funding agencies, viz.,Tea Board and NTRF.
Pesticide Residue laboratory was involved in the second level screening of TGLIA (The Golden Leaf India Awards competition) samples by technical analysis as per EU/PFA norms. Since 2005, under second level screening almost six hundred samples were analyzed involving 5,400 quantifications of pesticide residues/heavy metals with the selected samples from the first level screening. The Inter Governmental Group (IGG) of CODEX finalized the list of 25 chemicals for protection in tea in India. Based on the priority list, the residue data are generated for the chemicals and submitted to IGG working group on tea. Pesticide Residue laboratory was assigned to act as nodal laboratory in India for generation of residue data for submission to IGG/CODEX. Available data had been submitted to CODEX for fixing MRL in tea for few chemicals such as chlorpyrifos, paraquat, ethion, quinalphos and fenpropathrin.
MRLs of commonly used agrochemicals declared by different agencies
|Name of the chemicals||Maximum Residue Limit (mg/kg)|
|Hexachloro cyclo hexane isomer||–||–||–||–||–|
* lower level of determination by the instrument
News & Events11
News Letter June 2021
Newsletter-June 2021 Newsletter December 2021 Latest Annual reportRead More
MRL 31 JANUARY 2023
MRL 31 January 2023Read More
Wanted a post graduate in Botany for the post of Assistant Botanist at UPASI Tea Research Institute, Valparai. Upper age limit – 30 Pay scale: 14650-700-18150-900-22650-1100-28150-1425-35275-1800-44275 Suitable candidates with relevant qualification can apply within 15 days to The Director I/C UPASI TRF Valparai through email…Read More
Dr. C.S. Venkata Ram Memorial Annual Tea Colloquium
Dr. C.S. Venkata Ram Memorial Annual Tea Colloquium will be announced later.Read More
Residue analysis in other crops
The Pesticide Residue Division is equipped with state-of-art instruments viz., Gas Chromatograph, High Performance Liquid Chromatograph, GCMS, Atomic Absorption Spectrophotometer, etc., Our lab is GLP certified by National GLP Compliance Monitoring Authority, Govt. of India for the execution of Pesticide Residue Studies. We are accredited…Read More
Monthly circular – April 2014
Monthly Circular April -2014 WEATHER Weather data recorded in March 2014 at the TRF observatory are given below, along with the corresponding figures for March 2013. Year Total Rainfall mm Mean Sunshine hr/day Mean Temperature ° C Mean Relative Humidity % at Mean Evaporation…Read More
Radhakrishnan,B., K. K. Srikumar, Smitha, K. B. Suresh. 2018. Evaluation of Sulfoxaflor 50%WG against Tea mosquito bug, Helopeltistheivora Waterhouse (Hemiptera: Miridae). Pestology. 42 (3), 31-36. Radhakrishnan, B. 2018. Recent issues on pesticide residues and other contaminants in Tea. Planters chronicle. 114(1): 4-11. Radhakrishnan B. and…Read More
The principal landmark in the history of tea research in south India, was the establishment of a Tea Experimental Station in Gudalur in 1926. During the last seven and half decades, this research organisation. Now known as the UPASI Tea Research Foundation (UPASI TRF), had…Read More
Publications and Library
Annual Report is the one among the major publications of UPASI TRF. Annual report of each year is released by September of the following year. Other publications include Research Highlights and half yearly Newsletters. The Bulletin of UPASI TRF is an occasional publication. The Handbook…Read More
DATE: March 25th 2023
PLACE: CoimbatoreRead More
DATE: 22nd Jannuary, 2021
DATE: 06-08 May 2013
PLACE: ValparaiRead More
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Of late, considering the constant usage of pesticides and to monitor the residues in the final produce, a well equipped test facility was established at UPASI TRI in 1994. The pesticide residue laboratory is accredited by National Accreditation Board for testing and calibration Laboratories (NABL)…Read More
The Tea Research Institute at Valparai has seven divisions namely Botany, Soil Chemistry, Entomology, Pesticide Residue, Plant Pathology & Microbiology, Plant Physiology & Biotechnology and Tea Technology. Botany Research activities of Botany Division include plant improvement, cultivation practices and weed research. Plant improvement programme was…Read More
Chemistry Division is involved in research pertaining to soil-plant nutrients of tea besides extending analytical service to the industry. The research activities include investigations on physico-chemical properties of soil, soil-plant interactions, response of tea to major, secondary and micronutrients and their interactions. The research work…Read More
Entomology Division involve in basic and applied aspects of insect pests, particularly, biology, ecology and evolving control measures. The division evolved and recommended physical, chemical and biological method of tea pests control. In the past, extensive studies on bioecology, crop loss due to major pests…Read More
Pathology & Microbiology
In the division of Plant Pathology & Microbiology, research is carried out on diseases of tea and biofertilizers. Among the tea diseases, blister blight is the most important leaf disease caused by the pathogen, Exobasidium vexans affecting the tender harvestable shoots of tea resulting in…Read More
Physiology & Biotechnology
Plant Physiology Division was established in 1980 which has been primarily concentrated on crop productivity. The division strives for excellence in applied research in tea productivity and bush health besides biotechnological studies. The research undertaken extends over a wide range of research programmes having collaborative…Read More
Besides offering the analytical services and involving in inter laboratory ring test to validate the test methods, Tea Technology Division is concerned about quality of final produce in accordance with PFA Act requirements, storage studies, value added products and manufacturing aspects. The laboratory has been…Read More