The present study was conducted at Halebudanur village in Mandya district in Karnataka, India. The syringe method, a novel approach of insecticide administration into the coconut palm was applied using an eco-friendly, animal originated insecticide cartap hydrochloride 50% SP for the management of coconut black headed caterpillar, Opisina arenosella. The results of the study found that, all dilution of cartap hydrochloride 50% SP injected to base of the coconut palm effectively achieved 100% larval mortality of O. arenosella and protection lasted up to 90 days with no phytotoxic symptoms to the leaflets of treated palms. The syringe method has revealed quicker absorption of insecticides, easy to implement and no secondary infection or mechanical damage to the palm tissues and can be useful in coconut palm in managing O. arenosella population.