The present invention relates to a method for prolonging spore viability of fungal spores present in a liquid formulation, comprising (a) packaging said formulation in a suitable container； (b) reducing oxygen exposure of the spores in said formulation as compared to oxygen exposure of said spores when said formulation is in contact with air； and (c) closing or sealing said container. The invention further relates to a closed container comprising a liquid formulation within said container, said formulation comprising fungal spores, wherein the spores in said formulation have reduced oxygen exposure as compared to oxygen exposure of said spores when said formulation is in contact with air.
