Stabilized liquid cyclopropene compositions are provided which comprise flowable, non-aqueous dispersion concentrates comprising a) a continuous substantially water- immiscible liquid phase and b) a dispersed solid phase comprising cured polymer particles prepared from a polymerizable thermoset resin which particles contain at least one cyclopropene complex, optionally a non-porous particulate mineral, and optionally a non-cross-linkable mobile chemical distributed therein, and wherein the outside surfaces of the particles comprise a colloidal solid material. The compositions of the invention can be used directly or with dilution to combat pests or as plant growth regulators.
