Root-Guardis a talc-based formulation biological nematicide containing the following naturally occurring fungal species Arthrobotrys oligospora, A.conoidus, Paecilomyces funosoroseus, P.lilacinus and Verticillium chlamydosporium.. A highly efficient bio-balancer capable of improving soil food web ratios. Biodegradable and target specific. This is ideal for both organic and conventional growers. No withholding period.