Beneficial Nematodes are natural microscopic parasites (worms), that infest & kill more than 250 different pest larva. 90% of all insects spend at least part of their life cycle in the soil. All types of Beneficial Nematodes are very simple to use - mix with water and apply to infested area. Best applied twice per season. The nematodes will infest and kill their prey within 24-48 hours, continuing to reproduce. The young will seek out new hosts to infest. Please select from the following sub-classes of Beneficial Nematodes: