The present invention relates to a method for producing a liquid non-aqueous emulsifiable formulation comprising a pyripyropene pesticide of the formula (I) as defined below which is dissolved in an aromatic hydrocarbon or hydrocarbon mixture containing surfactants, which stabilize the emulsion upon dilution with water, which method comprises the steps i) and ii) as described hereinafter: i) dissolving the at least one surfactant and the compound of formula (I) in the organic solvent or solvent mixture to obtain a clear solution of the at least one surfactant and the compound of the formula (I); ii) heating the solution to a temperature of at least 40° C.