This invention relates to a process for the preparation of a biopesticide containing a plant extract or fractions of Callistemon comprising the steps of : a) extraction of dried ground plant leaves of Callistemon, b) concentrating the polar extract, c) dissolving the concentrated extract in a non polar solvent, followed by filtration and concentration, d) dissolving the concentrated residual in aqueous acetone, subjecting the mixture to filtration to obtain a semi brown solid (fraction), e) adding 10 to 50% (w/v) of fraction to 1-5 parts by weight of an emulsifier and 45 to 94 parts by weight of solvent to cbtain the biopesticide containing 10 to 50% (w/v) of plant extract or fract one of Callistemon, 1 to 5% of emulsifier and 45 to 94% of solvent.
