Propiconazole belongs to the triazole fungicide in sterol inhibitors. Its mechanism of action is to affect the biosynthesis of sterols, destroy the cell membrane function of pathogenic bacteria, and ultimately lead to cell death, thereby playing a role in bactericidal, disease prevention and treatment. Propiconazole fungicide has a wide spectrum of sterilization, high activity, fast sterilization speed and long duration. It has the characteristics of strong internal absorption and the like, and it is a representative of triazole fungicides with tebuconazole and flusilazole. The occurrence of propiconazole poisoning incidents caused by defective medication methods frequently occurs, which seriously restricts the application of this fungicide. Powder disease, anthracnose, melon powdery mildew, vegetable powdery mildew, pepper brown spot disease, etc. Depending on whether the weather is rainy or rainy or not). I have done field experiments. Spraying at 34h before rain and spraying at 2h before rain (34mm rainfall), the disease index after 18d is 7.8 and 8.5 respectively; while the condition of blank control refers to 43.7; propiconazole in rice The suction process is very stable and is marked after 14 days of application. 73.1% of the active fraction was absorbed by rice. In the grapes, 63% of the markers were present in the plants within 3 days. Propiconazole has a residual effect period of 20-30 days on plants. Among them, the fruit tree has a longer residual period than vegetables. The concentration is 800-1000 times liquid, banana 1000-1500 times liquid, tomato, pepper 3000 times liquid, grape 4000-5000 times liquid, strawberry 5000 times liquid, watermelon 6000-8000 If the term has the greatest impact, most will result in reduced production and reduced quality. Because propiconazole is only transmitted upwards in plants, and is stable in plants. The high accumulation of propiconazole inhibits the respiration of these plant tissues, leading to abnormal crop growth.
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Application of propiconazole
1. Wide spectrum of sterilization. Propiconazole can control a series of phytopathogenic fungi such as ascomycetes, basidiomycetes and deuteromycetes, and can effectively control various diseases caused by higher fungi on various crops, such as banana leaf spot, wheat sheath blight, and leaf blight. Disease, powdery mildew, rust, root rot, wing blight, peanut leaf spot, grape white
2, systemic conduction effect and stability. Propiconazole can be absorbed by the roots, stems, and absorption of plants (the most absorbed in the green part), and is transmitted upward through the xylem (cannot be transmitted to the base), and has the characteristics of rapid systemic conduction and stability in plants. Propiconazole is used on bananas and can absorb 30%-70% in 30 minutes (
The common phytotoxicity of propiconazole The common phytotoxicity of propiconazole foliar spray is that the young tissue is hardened, brittle, and easy to fold. The leaves become thicker and the leaves become darker. Plant growth is slow (generally does not cause growth stop), dwarf, tissue necrosis, chlorosis, perforation, etc. Seed treatment can cause delayed seed germination.
The phytotoxicity characteristics of propiconazole vary greatly in the tolerance of different crops. In recent years, we have observed the phytotoxicity of propiconazole in the seedling stage or young fruit stage of various crops, and found that different crops have greater tolerance to the tolerance of propiconazole. Such as enemy force off (effective ingredient content of 25% propiconazole EC) can tolerate wheat and rice
Double liquid.
The degree of phytotoxicity occurring in different growth stages of crops is different. Propiconazole is generally susceptible to phytotoxicity in the seed germination stage, shoot growth stage, shoot elongation period, flowering stage and young fruit stage of crops, and occurs less frequently in other periods. The losses caused by phytotoxicity in different periods are also different. Seedling stage has less impact, flowering and young
Causes of propiconazole phytotoxicity
1, propiconazole physical and chemical effects. Propiconazole has a certain plant growth regulating activity. It inhibits the synthesis of gibberellin in plants, reduces the content of gibberellin and indole acetic acid, eliminates the apical dominance of plants, makes the stem thicker, dwarfs the plant, and increases the content of chlorophyll, protein and nucleic acid. Simultaneously
2. Unreasonable use of pesticides . The user does not know the concentration of propiconazole used on various crops, and the random use of labels on other crops, the habitual increase in the concentration of use, and the lack of proper use are all causes of frequent occurrences of propiconazole drug accidents. .
3. Research institutes and agricultural technology promotion departments have not enough research on the application technology of propiconazole. Enterprises are also eager to pursue benefits, and they are widely introduced to the market without extensive and extensive trials and demonstrations.
Control measures for propiconazole toxicity
In the early stage of crop growth, if the cytotoxicity of propiconazole does not cause large-scale necrosis, only growth retardation can be achieved, and the auxin which promotes cell division can be detoxified by foliar application, and the foliar fertilizer is appropriately sprayed. There is little impact on production; increase publicity and promotion, and increase user awareness; production and sales enterprises should conduct a large number of experiments and demonstrations in the proposed marketing area to guide farmers to master safe and effective use methods. The agricultural technology departments at all levels have trained farmers to correctly master the drug use technology and improve the drug use level. This is an important measure to prevent the occurrence of drug damage accidents fundamentally; propiconazole is susceptible to phytotoxicity in crop young tissues, but it In the middle and late stages of crop growth, it is safer. This period is also prone to difficult diseases such as anthracnose. It is a powerful measure to reduce disasters and increase income by using the strong conduction effect of propiconazole and good bactericidal effect.
For the application of propiconazole and knowledge of phytotoxicity, the Chinese pesticide network Xiaobian is summarized here! If you want to know more about pesticides such as pesticide encyclopedia, please pay attention to the Chinese pesticide net Xiaobian.