Preparation method of water dispersible granules containing pyraclostrobin and dimethomorph

Abstract

The invention discloses a preparation method of a water dispersible granule containing pyraclostrobin and dimethomorph, and belongs to the technical field of pesticides, the preparation method comprises the following steps: preparing a primary mixture, preparing a secondary mixture, and preparing the water dispersible granule containing pyraclostrobin and dimethomorph. According to the preparation method disclosed by the invention, the content of pyraclostrobin and dimethomorph in the water dispersible granule can be increased while the influence of high-temperature granulation and drying processes on the plant growth regulator is avoided and the disintegration property, the suspension rate and the suspension stability of the water dispersible granule are improved, so that the phytotoxicity generated after the water dispersible granule is used is avoided.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a preparation method of water dispersible granules containing pyraclostrobin and dimethomorph. Background technique [0002] Pyraclostrobin is a new type of broad-spectrum methoxy acrylic acid fungicide. It inhibits mitochondrial respiration and eventually leads to cell death. It has the functions of protection, treatment, and leaf osmotic conduction. It is mainly used to prevent smelting crops from fungi A variety of diseases caused by it, such as powdery mildew, scab, downy mildew, black rot, brown blight, branch blight, angular spot, anthracnose, fusarium wilt, etc. have better control effects. [0003] Dimethomorph is a new type of systemic therapeutic low-toxicity fungicide. Its mechanism of action is to destroy the formation of the bacterial cell wall membrane, causing the decomposition of the sporangium wall and causing the bacterial death. In addition to zoospore form...

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Problems solved by technology

[0006] However, in the process of compounding pyraclostrobin and dimethomorph with plant growth regulators into water-dispersible granules, the following problems are prone to occur: the heat resistance of plant growth regulators is poor, and the high temperature of water-dispersible granules The activity of plant growth regulators will be affected during granulation and drying; the addition of plant growth regulators will affect the suspension stability of water-dispersible granules, which need to be prepared and used immediately; the addition of plant growth regulators will affect water dispersion The disintegration and suspension rate of granules requires adding more disintegrants and dispersants, which reduces the content of pyraclostrobin and dimethomorph, resulting in the inability to produce pyraclostrobin and dimethomorph Water-dispersible granules with low morphine content; pyraclostrobin and dimethomorph are prone to phytotoxicity during use, although plant growth regulators can reduce phytotoxicity, but the plant growth regulator after compounding to form water-dispersible granules The effect is slow and cannot alleviate the initial drug damage

[0007] In order to solve the above problems, the most commonly used method is to modify the dispersant and disintegrant and add synergist to enhance the effect of plant growth regulator, but it still cannot solve the problem of high temperature granulation and drying process on plant growth regulation. The activity of the fungicide is affected, and it cannot solve the problem of not being able to produce water-dispersible granules with high content of pyraclostrobin and dimethomorph, and the addition of synergists will also affect the bactericidal effect of the fungicide

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