Mancozeb

TC & FORMULATION: 90%TC, 80%WP, 75%WDG

Structure Formula

NOMENCLATURE

Common name mancozeb (BSI, E-ISO); mancozèbe ((m) F-ISO); manzeb (JMAF)

IUPAC name manganese ethylenebis(dithiocarbamate) (polymeric) complex with zinc salt 

Chemical Abstracts name [[1,2-ethanediylbis[carbamodithioato]](2-)]manganese mixture with [[1,2-ethanediylbis[carbamodithioato]](2-)]zinc 

CAS RN [8018-01-7] (formerly [8065-67-6]); number also applies to other mixed manganese and zinc ethylenebis(dithiocarbamate) complexes 

PHYSICAL CHEMISTRY

Composition The ISO definition is 'a complex of zinc and maneb containing 20% of manganese and 2.55% of zinc, the salt present being stated (for instance mancozeb chloride)'. A manufacturer gives the ratio of maneb to zinc as 1:0.091, i.e. 20% Mn and 2.2% Zn.  Mol. wt. 271.2 (based on Composition)  M.f. [C4H6MnN2S4]xZny  Form Greyish-yellow, free flowing powder with a slight odour of hydrogen sulfide.  M.p. Decomposes at 172 °C  V.p. <1.33 ´ 10-2 mPa (20 °C)  KOW logP = 0.26  S.g./density 1.92  Solubility In water 6.2 ppm (pH 7.5, 25 °C). Insoluble in most organic solvents; dissolves in solutions of powerful chelating agents but cannot be recovered from them.  Stability Stable under normal, dry storage conditions. Slowly decomposed by heat and moisture. On hydrolysis (25 ºC), DT50 20 d (pH 5), 17 h (pH 7), 34 h (pH 9). Mancozeb a.i. is unstable and the tech. not isolated; the formulated product is produced in continuous process.  F.p. 137.8 ºC (Tag open cup) 

APPLICATIONS

Biochemistry Reacts with, and inactivates the sulfhydryl groups of amino acids and enzymes of fungal cells, resulting in disruption of lipid metabolism, respiration and production of ATP.  Mode of action Fungicide with protective action.  Uses Control of many fungal diseases in a wide range of field crops, fruit, nuts, vegetables, ornamentals, etc. More frequent uses include control of early and late blights (Phytophthora infestans and Alternaria solani) of potatoes and tomatoes; downy mildew (Plasmopara viticola) and black rot (Guignardia bidwellii) of vines; downy mildew (Pseudoperonospora cubensis) of cucurbits; scab (Venturia inaequalis) of apple; sigatoka (Mycosphaerella spp.) of banana and melanose (Diaporthe citri) of citrus. Typical application rates are 1500-2000 g/ha. Used for foliar application or as a seed treatment. Formulation types DP; DS; OD; SC; WG; WP.

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