The present invention is based on an effective Application of compounds Caryophyllene oxide, Caryophyllene and Limonene derived from plant specie Spilanthes Calava D.C. in agriculture field as a pest repellant and insecticide. This plant specie has properties which can be utilized as a pest repellant and insecticide for the all crops, vegetables, horticulture., gardening, forestry and floriculture plants. These compounds can be easily be extracted from the flower head of said plant and plant parts through the aqueous solvent system. These three compounds are found together in one plant specie Spilanthes calava D.C, it has to be used in combination to make aerosol for imparting the knockdown effect. These compounds have three mode of action on the pest, like contact poisoning nerve poisoning and feeding poisoning.Caryophyllene is an electron transport inhibitor, and cause interference with glucose uptake or utilization. Caryophyllene oxide thus acts as a nerve poison to pest via sodium channel modulators. Limonene is Phagostimuiant disruptor which inhibits and breaks the developed resistant power against pesticide in the pests As an insecticide limonene destroys the wax that coats the inside of the insect"s respiratory system
