The world's second largest fungicide , pyraclostrobin, is very good for controlling powdery mildew, anthrax, downy mildew, and leaf spot disease. What are the specific characteristics of pyraclostrobin? Let's get to know it.
1 The efficacy of the drug is relatively slow, but it is quick to find the right time.
(1) The methoxy acrylate fungicide is a part of the QoI bactericide family. Its site of action is to disrupt the release of respiratory energy in the mitochondria of pathogenic fungal cells. That is, the energy produced during the respiration of pathogenic fungi is inhibited. Eventually "starved" pathogenic fungi. The actual performance of this mechanism of action is that the bacteria die very slowly. The efficacy of the drug is of course slow. Therefore, the timing of the use of this type of fungicide must be advanced, to prevent disease as a protective agent.
(2) These fungicides are more effective against spores in the developmental stage of pathogenic fungi, probably because spore formation and development require more energy supply. After the spring or after crop planting, the initial infection of most plant fungal diseases is accomplished by sprouts produced by spore germination on the surface of plant organs. Therefore, it is better to use the drug in the initial stage of the disease before sowing, after emergence, or at the time of planting.
2 high affinity with plant leaf epidermis
(1) Not afraid of the rain, it can penetrate into the plant tissue after a few minutes of application, making it unique in rainy areas and rainy seasons.
(2) The drug is concentrated in the epidermis tissue of the leaf, and the mesophyll tissue in the middle is relatively small, so that the effect on the pathogenic bacteria that have invaded the organ is poor. Therefore, in addition to being used in advance, such a fungicide is used. It is best to mix with the systemic therapeutic agent, and more fungicide formulations are derived, and more selling points will follow.
(3) When mixing with conventional protective fungicides, it should be noted that if the spraying is uneven, the chemicals on the front and back sides of the leaves are different, and pyraclostrobin will rapidly distribute and penetrate into the upper and lower sides. The conventional protective fungicide in the epidermal tissue, but not absorbed by the plant tissue, can only be distributed on one side of the leaf, and the pyraclostrobin on the other side is more likely to induce the resistance of the pathogen to the agent, thereby affecting the life cycle of the product. . Therefore, uniform spraying is very important.
(4) Differences between dosage forms can choose different selling points. The emulsion formulation enhances its high permeability and has a stronger advantage in the rainy season and rainy areas, but the risk of phytotoxicity is greater, and the dosage should not be increased arbitrarily; the safety of the suspending agent is strong, and it is used in rainy seasons and regions. Medication.
3 Clever use of the “greening effect†and “initiation-inducing function†of pyraclostrobin
The study found that methoxy acrylate fungicides have a “greening effect†on crops. By extending the functional period of chlorophyll in wheat leaves during grain filling, the filling time and efficiency are increased, and wheat yield is increased. Pyraclostrobin can also awaken the memory of the crop's health status and activate the plant's anti-reverse immune function when the plant encounters drought, pathogen infestation and other adverse conditions. Based on these principles, how do we combine the growth management of specific crops in specific regions, and at the optimal time, in the most appropriate dosage and method, let pyraclostrobin fully display its second face, plant growth immunomodulator.
4 cleverly avoid high-priced shadows, low-dose use
With the numerous brands and varieties of pyraclostrobin in China, the price war is inevitable. However, within a short period of time, the unit price of pyraclostrobin is much higher than that of conventional fungicides, which will undoubtedly increase farmers' purchase concerns. One of the tricks to crack is to reduce the dose used. However, when BASF recommends a dilution factor of 5000 times, and some domestic companies recommend 3000 times, the cost-effective advantage of domestic pyraclostrobin is difficult to present. Is it because there is a problem with the quality of the product, or is it because of psychological reasons? When ensuring that there is no major problem with the quality of the product, let’s do a few more experiments to find out whether it can be diluted to a multiple of 5,000 times or more. This selling point is handed over to the farmers.
Finally, introduce the common compounding agents of pyraclostrobin, such as epoxiconazole, captan, chlorfenapyr, seed dressing, organic copper, organotin, etc. In order to obtain more pesticide knowledge, please pay attention to China Pesticide Net
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