Mancozeb is an old drug that has been used for many years in China. It has excellent properties such as broad spectrum, low toxicity, low residue, high efficiency and multiple action sites. At the same time, mancozeb also has good compatibility, can be mixed with many systemic fungicides , improve the efficacy and delay the production of resistance to systemic drugs. Trace elements of manganese and zinc have obvious effects on crop growth and yield increase. It is one of the main protective fungicide products in China's fruit and vegetable producing areas.

The mystery of the life of mancozeb

Mancozeb molecular formula

● In 1940, a new compound was obtained from disulfide, the first true ethylene biscarbamate fungicide (EBDC), the sodium sensation. Due to the unstable drug efficacy of Dyson sodium, soon Dyson Zinc was introduced.

● In 1950, the more active Dyson Manganese developed by DuPont was launched.

● In 1958, the German company BASF introduced Daisen United for the first time.

● In 1963, Bensen Zinc was first reported.

● In 1962, Romhas (now American Dow Chemical Company) introduced the ionic polymer product of mancozeb and sensen zinc, mancozeb.

Multi-site bactericide schematic picture Source: Zhao Zhanzhou New Farmhouse

The Daisen organosulfuricide itself cannot directly act on plant pathogens, but is converted to EBIS in water or air and further converted to EBI under ultraviolet irradiation. EBIS and EBI are truly bactericidal compounds.

These two active substances participate in six metabolic processes in the pathogen cells and inhibit the oxidation of pyruvate in the cells. Finally, it is reflected in the inhibition of spore germination of pathogenic bacteria.

Here are some other similar fungicides:

Mancozebium : The active material has the fastest conversion rate, unstable drug effect, short duration of action, and is prone to phytotoxicity.

Desen Zinc : The drug is unstable, the sterilization is not broad enough, the protection ability is general and there is no killing effect on the fungus.

Benseson zinc : high zinc content, good protection, but lacks the sterilization effect of manganese ions.

Daisenlian : The zinc content is higher, the protection effect is better, the leaf surface is brighter and the fruit surface is brighter and brighter, and the sterilization effect of manganese ions is lacking.

Compared with the fungicides such as mancozeb and daisen zinc, the molecular structure of mancozeb is more stable. After spraying on plants, the conversion of EBIS and EBI is more stable and controllable, which results in mancozeb. It has the advantages of better drug efficacy and higher safety for crops.

Main control objects: pear black spot disease, citrus scab disease, ulcer disease, apple spotted leaf disease, grape downy mildew, litchi downy mildew, Phytophthora, green pepper blight, cucumber, melon, watermelon downy mildew, tomato blight, Cotton rotten bell disease, wheat rust, powdery mildew, corn spot, streak, tobacco black shank, yam anthracnose, brown rot, root neck rot, spotted leaf disease.

Excellent properties of mancozeb

1 Broad spectrum and high efficiency are effective for most fungal plant diseases.

2 Safety, low risk is safe for plants, safe for humans and animals, and safe for the environment, there is almost no risk of drug resistance.

3 Good mixability can be mixed with most fungicides and insecticides , even including copper formulations with good sustained release properties.

4 Compared with the new fungicide with a relatively low price of more than ten yuan or even several tens of yuan per barrel, the mancozeb is not as high as ten yuan per barrel.

The main dosage form of mancozeb

Single component dosage form

● 50%, 70%, 80% wettable powder

● 25%, 30%, 70% suspension agent ● 75% water dispersion granules

Two-component dosage form

Cyanurate with cymoxanil: 72% cream urea•manganese zinc wettable powder, 72% kelu wettable powder.

And metalaxyl: 58%, 72% nail cream • manganese zinc wettable powder, 53% fine nail cream • manganese zinc, fine metal creamer • manganese zinc water dispersible granules.

And enoylmorpholine: 65% Anke•Manganese-zinc wettable powder (or water-dispersible granules), 69% enoyl•manganese-zinc wettable powder.

With the evil cream: 64% cream • manganese zinc wettable powder, 64% anti-virus WP.

And iprodione: 50% manganese zinc • iprodione wettable powder.

With carbendazim: 40% more • Manganese zinc wettable powder.

With thiophanate-methyl: 30% methyl sulfide • manganese zinc suspoemulsion.

With matrine: 37.5% matrine • mancozeb suspension.

With carbendazim and thiram: 50% more • Fu • Mn-Zn wettable powder.

Precautions for using mancozeb

1. In the morning when the weather is warm and warm, under the ultraviolet irradiation, the conversion of mancozeb on the surface of the plant to EBIS and EBI is faster, and the rate of exerting the effect is better. However, the weather with strong light exceeding 35 °C is used with caution, and the conversion rate of the active ingredient under high temperature and strong ultraviolet light is too fast, which may easily lead to phytotoxicity.

2. Careful use of crops such as melons, apples, cherries, and some varieties of grapes to avoid phytotoxicity.

3, try to mix with other fungicides, and strive to evenly spray to ensure that the agent can cover the surface of the plant to the maximum extent, pay attention to not be mixed with alkaline pesticides , fertilizers and copper-containing solutions.

4, try to choose a good process of dispersible granules, dry suspension, suspoemulsion and other dosage forms.

5, the agent has a stimulating effect on the skin and mucous membranes, pay attention to protection when using!

(Source: Agricultural Assistant)

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