RootShield Granules - 10 lb.- 2H03A05Mix OMRI Listed RootShield Granules in your soil or media before planting to ensure that the developing roots of your new plants are protected against plant pathogenic fungi like: Pythium Rhizoctonia Fusarium Sclerotinia Thielaviopsis Cylindrocladium The active ingredient in RootShield Granules is a patented fungus, Trichoderma harzianum Rifai strain T22. It is a subspecies of T. harzianum, one of the most prevalent fungi globally, that is designed to