Beneficial nematodes - Provides excellent biological control of fungus gnats by eliminating damaging fungus gnat larvae. A single application of NemaShield beneficial nematodes (Steinernema feltiae) is sufficient for preventing fungus gnat outbreaks or for control in the beginning phase of an outbreak. NemaShield is effective in a Western Flower Thrips (Frankliniella occidentalis) control program for treatment of pupae and pre-pupae. It will also control thrips species that spend a portion of their life cycle in the soil or potting media. Overnight shipping costs included!