Mr.Vinayak M. Kamble
Vinayak Kamble is pursuing his PhD in Institute of Chemical Technology Mumbai.
Title: Biological activity and Controlled Release Performance of Microencapsulated Chlorpyrifos against Helicoverpa armigera in Chickpea (Cicer arietinum)
Biography
Biography: Mr.Vinayak M. Kamble
Abstract
This study focused on the development of the controlled release formulation of chlorpyrifos for the agricultural application using microencapsulation. Chlorpyrifos is a broad-spectrum organophosphorus insecticide that is widely used to control agricultural pests. In order to prolong the persistence of chlorpyrifos, it was microencapsulated via interfacial polymerization by the polyurea as a wall material. The release dynamics and field efficacy of the chlorpyrifos were evaluated in the present study. It was found that the encapsulation of the chlorpyrifos significantly extended the insecticide release. The diameter of chlorpyrifos loaded polyurea microcapsules found in the range of 1-5 µm with an excellent encapsulation efficiency of > 90%. The SEM images of the ruptured microcapsule show the formation of the core and shell structure. The release kinetics and controlled release profile were investigated by the HPLC. The microencapsulated chlorpyrifos show sustained release performance over 60 days with high pesticide loading. The LC50 and LC90 values of microencapsulated chlorpyrifos were 12.4 and 63.56 mg a.i./L, respectively, after 72 h of exposure. Based on LC50 values, results of bioassay showed the microencapsulated chlorpyrifos was highly toxic against 3rd instar Helicoverpa armigera. Moreover, microencapsulation found effective in controlling the Helicoverpa Armigera population on chickpea than that of conventional emulsion formulation.