Maneb

DescriptionManeb is a pesticide with fungicide properties and belongs to the carbamate (bis-dithiocarbamate) group. Sensitization occurs mainly in farmers and agricultural workers.

UsesManeb is a complex of manganese with the ethylene bis(dithiocarbamate) anionic ligand. Maneb is a foliate fungicide used to protect crops in agriculture. Maneb is also useful in creating a toxin-based animal (usually primates) model of Parkinson's disease.

UsesManeb is a contact fungicide that provides protection against a wide variety of fungal diseases (including leaf spots, blight, rust, downy mildew, scab, etc.) in field crops, fruits, vines, vegetables, ornamentals, potatoes, turf, berries and forestry.

General DescriptionManeb is a yellow powder or crystalline solid. Maneb is denser than water. Contact may irritate skin, eyes and mucous membranes. Maneb may be toxic by ingestion. Likely to generate heat spontaneously upon exposure to air or water. May be sufficient to ignite the material. Maneb is used as a fungicide. Formulations of Maneb include mixing Maneb with many other chemicals such as sulfur, zinc oxide and others to desensitize it. This is done to make Maneb easer for application.

PreparationManganese ethylenebis(thiocarbamate) is made by adding disodium ethylenebis( dithiocarbamate) (also, known as Nabam, commercially available) to an aqueous solution of manganese(II) sulfate: NaSC(=S)NHCH2CH2NHC(=S)SNa + MnSO4 → C4H6MnN2S4 + Na2SO4 Alternatively, the compound may be prepared by neutralizing an aqueous solution of disodiummethylenebis(dithiocarbamate) (Nabam) with acetic acid followed by addition of manganese(II) chloride solution.