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BIO BLOCK is a 100% organic systemic neem fungicide that can treat a wide variety of fungus as well bacterial infections and plant diseases. Non-toxic, eco friendly. Neem oil can be used for certain insect and fungal disease issues. It kills insects by suffocation, covering their bodies with oil that blocks their breathing openings. It is most effective against immature insects. Mature adult insects aren’t typically killed and may continue to feed and reproduce. Thus, close monitoring of pest lifecycles is necessary for timing a neem oil application.