RootShield’s active ingredient is Trichoderma harzianum strain T-22, which provides preventative control of Pythium, Fusarium, Rhizoctonia, Cylindrocladium, and Thielaviopsis species.
RootShield PLUS+ contains an additional active ingredient: Trichoderma virens strain G-41. This active broadens the disease spectrum to include Phytophthora spp. and provides better control of hot season Pythium spp. (e.g., Pythium aphanidermatum).