BioWorks RootShield WP — Trichoderma harzianum Biological Fungicide, 3 lbRootShield WP is an EPA registered, OMRI listed biological fungicide based on Trichoderma harzianum strain T-22 — a highly effective beneficial fungus that colonizes plant roots and protects them from soilborne pathogens. Applied as a soil drench or media incorporation, RootShield provides up to 12 weeks of root disease protection in greenhouse, nursery, and hydroponic production systems.Special Order Item — this product ships from the manufacturer at the time of purchase. Shipping times may vary.Key Features Active ingredient: Trichoderma harzianum strain T-22 Controls Pythium, Rhizoctonia, Fusarium, Thielaviopsis, and Cylindrocladium Colonizes roots within 24 hours — blocks and actively attacks pathogens Up to 12 weeks of protection per application OMRI listed for organic production | VeriFlora approved EPA registered biological fungicide Wettable powder (WP) formulation — apply as soil drench or media incorporation 3 lb box | Green scoop included = 1.5 oz of product ApplicationDrench into growing media at transplant or seeding. Compatible with hydroponic, rockwool, and soilless production systems.Also available: RootShield WP 1 lb and RootShield WP 30 lb. Browse more Beneficial Microbiology or return to Pest & Disease Controls.