Steinernema carpocapsae is particularly tolerant of storage conditions, a major reason for its ready availability. Recently, systems to dry Steinernema nematodes for extended storage have been developed, a process that can increase storage life and eliminate the need for refrigeration. These are now being marketed in some nurseries and through mail order. Regardless, insect parasitic nematodes can be killed or inactivated by extreme temperatures. Information is still lacking regarding the persistence of insect parasitic nematodes in turfgrass under Colorado conditions.
Native nematodes do occur in the state.
One of the most spectacular is Mermis nigrescens , often over 4 inches long, which is a common parasite of grasshoppers. Commercially available strains have originated from the southern United States or other mild climates. Those that reproduce can produce multiple cycles of infection during the growing season. However, it is likely that extremes of cold, drying or high summer temperatures would kill off nematodes under Colorado conditions. Furthermore, various soil organisms, including predatory mites, feed on nematodes and may reduce populations to ineffective levels.