As one of the important methoxy acrylate fungicides , pyraclostrobin has been widely used since its introduction into the market, with a wide spectrum of bacteria, high target bacteria, strong immunity, improved crop stress resistance, promotion of crop growth, and anti-aging. The function of fungicides can be verified and approved by most users.
The reason why pyraclostrobin has received industry attention is fundamentally its excellent application performance. But the best medicine, if it won't be used, it is a waste! This article combs the question about the use of pyraclostrobin, for your reference.
1 Pyraclostrobin, emulsifiable concentrate, suspension, powder Which is better?
In general, each has its own differences.
(1) powder
It will be dispersed during processing and use, causing environmental pollution, which is the biggest problem of powder.
(2) emulsifiable concentrate
Originally used toluene, xylene, but the country does not advocate the registration of emulsifiable oil, it began to use microemulsion, water emulsion, or replace with vegetable oil, is a relatively backward dosage form, but some products must be made into emulsifiable concentrate.
(3) Suspending agent
The suspending agent is relatively advanced, the process is strict, and the processing cost is also high, but the state is not stable, and stratification may occur for a long time.
2 What is the relationship between pyraclostrobin, azoxystrobin and ether oxystrobin?
Ethoxystrobin, azoxystrobin, pyraclostrobin is called the three brothers in the fungicide, they are all methoxy acrylates, methoxy acrylate fungicides are natural methoxy acrylates Antibiotics are a new class of fungicides developed for lead compounds.
There are many common features in agricultural applications:
(1) Unique mechanism of action. They are all mitochondrial respiratory inhibitors of pathogenic fungi and are effective against strains that have developed resistance to sterol inhibitors such as triazoles, phenylamides, dicarboxamides, benzimidazoles.
(2) A broad spectrum of sterilization. It shows excellent activity against almost all fungal diseases, such as powdery mildew, leaf blight, red spot, net blotch, black shank, rice blast, rice sheath blight, and downy mildew , epidemics, etc. have very good activity, and the prevention and treatment of epidemics is more important.
(3) It has protective and therapeutic effects, and has good penetration and systemic action. It can be used in the methods of stem and leaf spray, water surface application and seed treatment.
(4) It is highly selective. It is safe for crops, people, animals and beneficial organisms, and has no pollution to the environment.
the difference:
(1) Azoxystrobin has a broad spectrum of bactericidal activity and is effective against most pathogenic bacteria in ascomycetes, basidiomycetes, deuteromycetes and oomycetes.
(2) The bactericidal spectrum of the oxystrobin is not as broad as that of azoxystrobin, but has special effects on powdery mildew.
(3) Pyraclostrobin has the strongest antibacterial activity, and has strong ability to inhibit the spore germination of pathogens, and has significant antibacterial activity against plant pathogens such as ascomycetes, basidiomycetes, deuteroms and oomycetes. It is active and has potential therapeutic activity and can be used to control a variety of crop fungal diseases. Pyraclostrobin has strong conductive activity in plants, which can improve crop physiology and enhance crop stress resistance.
All three compounds have the function of protection, treatment and eradication. The biggest difference is that the ethereal ester is less mobile than the other two. Pyraclostrobin is more active than the first two, and azoxystrobin is more permeable.
3 Pyraclostrobin is treating rickets?
Pyraclostrobin can be used in various crops such as wheat, peanuts, rice, vegetables, fruit trees, tobacco, tea trees, ornamental plants, and lawns.
Control various diseases such as leaf blight, rust, powdery mildew, downy mildew, blight, anthracnose, scab, brown spot, and blight caused by ascomycetes, basidiomycetes, deuteromycetes and oomycetes.
Cucumber powdery mildew, downy mildew, banana scab, leaf spot, grape downy mildew, anthracnose, powdery mildew, tomato and potato early blight, late blight, powdery mildew and leaf blight Control effect.
4 Usage and dosage of pyraclostrobin on various crops (for example, 20% pyraclostrobin WP)
4.1 How much water to add?
(1) How many pounds of water does the 100 g medicine play?
You can hit 300 pounds of water.
(2) 1 barrel of water can not be used for 20 g of medicine?
If it is used in wheat, rice and other crops, it is not a problem, but it can cause phytotoxicity on sensitive crops, such as strawberries, so a bucket of water 10 g ~ 15 g is a safer dosage.
4.2 Cereal crops
Pyraclostrobin has a broad spectrum of bactericidal activity against cereal crop diseases.
(1) It has outstanding control effects on the diseases of the leaves and ears of cereals, and the effect of increasing yield is remarkable.
The single-agent therapeutic test can effectively control wheat leaf blight, and can also observe the concurrent treatment of wheat blight.
Even in the case of serious disease, pyraclostrobin can effectively prevent the damage of leaf rust and stripe rust on barley and wheat, and at the same time treat leaf blight and reticulosis of barley. Pyraclostrobin is also effective in controlling other cereal diseases such as wheat leaf blight, snow rot and leukoplakia and barley moiré.
(2) Do the package on the wheat, the amount of 10 mu is not small?
If it is a compound, it is not small. If it is used alone, it will be a little small. For the first time, it is possible to use 10 to 20 g of 1 mu of land.
4.3 Bean crops
(1) Pyraclostrobin has a good control effect on the main diseases of beans such as bean leaf spot, rust and anthracnose.
(2) Pyraclostrobin can effectively control peanut brown spot, black spot, snake eye disease, rust and scab. In addition, it has a good control effect on peanut white diarrhea.
4.4 Fruit and vegetable crops
(1) Grapes
Prevention and treatment of downy mildew, powdery mildew, gray mold, brown spot, cob brown and so on can be added to pyraclostrobin, which can be used alone in the first leaves of the grape.
On the grapes, in the case of normal single use, 30 kg of water is used for 10 g to 15 g.
In the prevention and treatment of grape downy mildew, pyraclostrobin can be used in combination with chlorpyrifos or dimethomorph.
Pyraclostrobin has good control effects on tomato and potato diseases such as early blight, late blight, powdery mildew and leaf blight.
(2) Citrus
It is used before the high incidence of disease, and it has a good preventive effect on common anthracnose and scab.
The results show that pyraclostrobin has a good control effect on citrus scab, resin disease and black rot. It can also improve the quality of citrus if it is used interchangeably with other chemicals.
(3) pear tree
One acre of land with 20 ~ 30 g, plus water 60 kg evenly spray, to prevent pear tree scab, can also be combined with difenoconazole and other fungicides.
(4) Apple
Mainly control fungal diseases, such as powdery mildew, early defoliation, leaf spot and so on. However, it is necessary to pay attention to the sensitivity of some varieties.
(5) Red dates
Prevention of flowering coal pollution, late anthrax, 2,000 times the first single of the drug, the second time with tebuconazole or difenoconazole (control of coal pollution can be combined with mites)
(6) Watermelon
In the early stage, it can be used to prevent vines; in the middle and late stages, anthracnose, blight, etc., according to local conditions, can be used 1 to 2 times during the prevention, and can be compounded during the later treatment to treat downy mildew and disease. Wait.
(7) Cucumber
It is very effective on cucumber, preventing downy mildew, powdery mildew, anthracnose, spotted diseases, increasing chlorophyll content, increasing photosynthesis, reducing plant respiration and improving crop stress resistance.
5 When to use
(1) The timing of the use of this type of fungicide must be advanced, to prevent the disease as a protective agent, or to use the drug at the beginning of the disease before planting, after emergence, or at the time of planting, and to give full play to the advantages of the drug.
(2) Pyraclostrobin is known for its efficacy and long-lasting effect, and its quick-acting effect is slightly insufficient compared with other targeted fungicides. It is best to use it with other fungicides or with a compounding agent.
(3) The action site of pyraclostrobin is relatively simple, so the resistance starts relatively fast. Be sure to control the number of uses during use to avoid accelerated resistance.
(4) The strong permeability allows pyraclostrobin to be well-affined with the surface of the leaf, greatly improving the control effect and duration, but pay attention to the occurrence of phytotoxicity. Especially in the crop seedling nursery period, under the conditions of strong crop growth and high temperature and high humidity, the use concentration of pyraclostrobin will have a certain risk of phytotoxicity.
6 compounding problem
Be careful not to mix with alkaline fungicides. Do not mix with emulsifiable concentrates or silicones. Mix the concentration with other chemicals and do the test.
Mixing pyraclostrobin and foliar fertilizer requires dissolving the foliar fertilizer, then pyraclostrobin, and finally pouring other things.
Under normal circumstances, pyraclostrobin + Xinxi + potassium dihydrogen phosphate + trace elements, the effect will be very good.
Pyraclostrobin itself has a high penetration and it is not recommended to add silicone.
Pyraclostrobin can be used in combination with brassinolide, but it is preferred to mix it after two dilutions.
It is not recommended to mix pyraclostrobin with an oxidizing pesticide (potassium permanganate, hydrogen peroxide, peracetic acid, chlorobromide, etc.).
7 Other problems such as phytotoxicity
Pyraclostrobin powder is used at a reasonable dilution factor and generally does not cause phytotoxicity. However, if there is a precedent for the phytotoxicity of pyraclostrobin in the local area, it is recommended to experiment first.
Pyraclostrobin is a good ingredient, but it is by no means versatile. It is a good product to put the products in the right place.
As a fungicide, intensive protective and immunological functions are far more important than intensive therapeutic functions.
As a function of promoting growth, it is important to strengthen the fruit expansion at the young fruit stage than to strengthen the fast fruit expansion stage.
As a function of increasing yield and income in field crops, it is important to strengthen the effective ear (pod) ratio and increase the number of kernels.
As a stress-resistance function, intensive prevention is more important than remediation.
As a crop health function, synergistic use with fertilizers is especially important.
As a methoxy acrylate fungicide, it is preferred to use less and never use it.
(Source: daily agricultural materials)
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