Virtual Conference

Md. Sultan Ahmed

Bangladesh Agricultural Research Centre, Bangladesh

Title: Determination of Pre-Harvest Interval for Lambda-Cyhalothrin, Deltramethrin, Cypermethrin and Fanvalerate in Conventional Vegetables of Bangladesh


The study was conducted to determine the per harvest interval (PHI) for lambda-cyhalothrin in eggplant, deltamethrin in hyacinth bean, cypermethrin in cauliflower and for fanvalerate in cauliflower and hyacinth bean depending on Maximum Residue Limit (MRL) Set by European Union. Five supervised field trials were conducted and sprayed on vegetables with the recommended dose at the rate of 1 ml/L of water of lambda-cyhalothrin, deltamethrin, cypermethrin and fanvalerate. Samples were collected at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11days after spray (DAS). Samples were analyzed using Gas Chromatograph with Electron Captured Detector at Pesticide Analytical Laboratory, Bangladesh Agricultural Research Institute. The quantities of pesticides were above MRL up to 4 DAS for cypermethrin in cauliflower, 7 DAS for lambda-cyhalothrin in eggplant and deltamethrin in hyacinth bean; No residue was detected at 8 DAS in cauliflower for cypermethrin, 10 DAS in eggplant for lambda-cyhalothrin and in hyacinth bean for deltamethrin. In case of fanvalerate, the pesticide quantities were above EU-MRLs at 8 DAS in hyacinth bean; 9 DAS in cauliflower.The PHI was determined at 5 DAS for cypermethrin in cauliflower, 8 DAS for lambda-cyhalothrin in eggplant and for deltamethrin in hyacinth bean. But for fanvalerate the PHI was 9 DAS in hyacinth bean and 10 DAS in cauliflower. Farmers are advised to maintain aforesaid PHI to ensure their crops are safe for consumption. 


Md. Sultan Ahmed did PhD on pesticide research in Entomology. Presently he works as a Principal Scientific Officer at Bangladesh Agricultural Research Institute, Division of Entomology, Gazipur. About 28 years of working experience in pesticide residue analysis, pesticide efficacy testing and integrated pest management on different crops. He successfully completed hands on training on GC and GC/MS Techniques, Troubleshooting at Shimadzu (Asia Pacific) Pte Ltd, Singapore; LC-MS/MS Techniques and Troubleshooting at Thermo Fisher Pvt. Ltd., UK and Insect pest management on stored grain pest at Murdoch University, Western Australia. He published 45 papers in International and National reputed Journals about pest management, Pre-harvest interval in different crops and pesticide residue monitoring in different food commodities. Most of the publications are online and available in Research gate. He also published two books, three training manuals and different booklets, leaflets and factsheets in his research area to ensure safe food production for the consumers. His major research area is pesticide research and environmental toxicology. He has guided MS/PhD students as a research Co-Supervisor. He has been serving as an editorial board member of several reputed journals.