Entomopathogenic nematodes (EPNs) are way more versatile than people think. EPNs are soft-bodied, nonsegmented roundworms that live in the soil and are specialized in parasitizing soil borne insects. The use of entomopathogenic nematodes to control soil pests has been a common agricultural practice for many decades. Extensive literature reports that they can also infect foliar insects, but foliar application of nematodes does not yet appear to be a popular option. For some time now, Koppert Biological Systems has invested in high quality research to explore EPNs and results show they can be highly effective, especially to control caterpillars. That's good news for growers, as they now have more effective options for biological control that make them less dependent on chemical products.