Dissipation Pattern of carbendazim and cypermethrin on Curry Leaf
Abstract
Field experiments were conducted during kharif 2 014 and 2015 with curry leaf variety Suwasini to study the dissipation pattern of car bendazim 50 EC at 500 g a.i. ha -1 and cypermethrin 10 % EC @ 50 g a i/ha (550 ml/ha) 1 by giving two sprays first at vegetative stage and second 10 days later. The leaf sa mples collected at 0, 1, 3, 5, 7, 10, 15, 20, 25, 30 and 45th day after second spray and soil samples at 45th day for residue analysis showed initial deposits of carbendazim 16.00 mg kg-1 and Cypermetrin 13.09 mg kg-1 which ,dissipated to 0.04 mg kg -1 and 0. 28 mg kg – 1 respectively. The residues reached to Below Determination Level (BDL) at 20 and 10 days, respectively. As there were no pesticide recommendations and MRLs fixed for any of the pesticide in curry leaf, the day at which residues reached BDL can be suggested as the safe harvest period for curry leaf.
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Introduction
Curry leaf [ Murraya koenigii (L.) Sprengel] is a leaf spice of the citrus family Rutaceae. Curry leaves form an integral part of spicing up dishes and not a part of mere garnishing. They are rich in medicinal nutraceutical properties and have even cosmetic uses. In India, of late it is cultivated on commercial scale in Tamil Nadu, Karnataka, Andhra Pradesh and Telangana states and has gained importance as a major spice crop with high export potential (Mohan, 2012). A total of 12 insect pests belonging to 10 families of 5 orders were recorded infesting curry leaf plants (Tara and Monika Sharma, 2 010).As per Insecticides act, 1968 there is no pesticide recommendation for spray on curry leaf as on today and hence there are no MRL’s suggested by Codex Alimentarius Commission. However, farmers are using pesticides indiscriminately that are designed to control the pest even if there are no recommendations for the crop and whether the pest is present or not. Hence, residues were detected at the farm gate level for export location and led to the rejection of the consignment (Ramakrishnan et al. , 2015 ). According to the report of the Indian delegation at 45th session of the Codex Committee on Pesticide Residues (CCPR) held at Beijing P. R. China (May 6 -11, 2013) in agenda no. 11, India is considered for fixation of new and revised MRL’s of profenophos, chlorpyriphos, cypermethrin, methyl parathion, triazophos, ethion and quinalphos in curry leaves based on good agricultural practice (GAP) trials and monitoring data and should submit in the prescribed format to Joint FAO/WHO Meeting on Pesticide Residues (JM PR), as a follow -up, for evaluation in 2014 for fixation of MRL on curry leaves. By keeping in view all these most important issues of concern, the present comprehensive study , on dissipation of insecticides viz., carbendazim 50 EC at 500 g a.i. ha-1 and cypermetrin 20 EC at 300 g a.i. ha-1 was carried out in curry leaf.
