How to treat coriander leaf blight mildew? What medications are needed?

It is recommended to choose one or two flusilazole, difenoconazole, propiconazole, etherstrobin, iprodione, chunleimycin, polyantimycin, pyraclostrobin, etc. At the same time, most gray mold pesticides can also control leaf mold. Hit it all over and through.

In the case of greenhouses, humidity should be controlled, and sterilizing fogs should be used to control the condition on rainy days. Prevention first, comprehensive prevention and control. Use pesticide ingredients alternately, and do not use the same pesticide ingredients consecutively.

This is the principle of crop protection.

Coriander leaf blight mildew is mainly treated with soil treatment and soil disinfection. At the same time, it can be used to flush or irrigate the roots with microbial agent root boys, and use it 2-3 times in a row, which is high in improving the stress resistance of crops, and almost no disease occurs in the later stage.

Coriander spotted blight mainly harms the leaves, the leaves are dry at the beginning of the disease, and there are light brown spots on the leaves, and as the disease worsens, the infected leaves wilt, and the spots become dark brown, which will conduct infection stems and heart leaves. Coriander leaf blight mainly harms the leaves of coriander, and the more common ones are the leaves that harm the young parts of coriander, that is, the newly grown leaves, which may be infected with this disease throughout the growth and development of coriander.

You can pull one out of the agricultural station (that is, the place where you buy pesticides) to show them, your vegetables, what kind of disease, the agricultural station will give you what medicine to fight, the prevention and control of coriander leaf spot, spot blight and other fungal diseases, generally choose difenoconazole, prochlorazine, mycloconazole and other fungicides, if soft rot occurs, you can use (copper hydroxide) spray, or Ningnanmycin, leaf dry azole and other bactericidal agents.

Bacterial keratosis, a little bacterial pesticides, such as DuPont's can kill 3,000, coriander seedling plot is not properly selected, planted in the strong wind outlet, the long-term strong wind blows to intensify the water transpiration of coriander leaves, destroys the water balance in the coriander body, and makes the coriander leaves wilt, which is a physiological disease.

The main insect pests that cause leaf curling are aphids and whiteflies. They not only suck the sap of stems and leaves, but also secrete some sticky substances to cover the leaf surface, which not only affects the respiration and photosynthesis of leaves, but also susceptible to mildew disease, causing leaf curling. This kind of fungicide, it has an early preventive effect on this strain of rot, and then add this extract of sharp bacteria, the ingredients of extract sharp bacteria are, methyltrophic bacillus, a chemical agent plus a fungus, each kilogram of coriander seeds with Gaoqiao 10ml + Yiwei 20 grams of coating, dry and sowing, and pay attention to the prevention of disease.

Seedlings are dead due to excessive use of chemical fertilizers. After sowing, the whole field can be sprinkled with loose soil essence, 200 grams to 300 grams per mu to improve the soil.

Under the condition of high humidity, it is easy to get sick, and this disease is actually not killed well in winter, so it will regrow and multiply in spring, resulting in large-scale infection.

The main rule is that once the leaf blight occurs, it will immediately spread to the surrounding coriander, and in severe cases, it will spread to the entire vine, and the lower leaves of the plant will be severely diseased, and high temperature, humidity, and poor ventilation may lead to the occurrence of disease.

The infection is very fast, the leaves will turn yellow, and if it is relatively wet, it will rot, and it is easy to get this disease if it is not well ventilated.

At the time of planting, these seeds have a certain amount of bacteria on them, and when the weather temperature is right, these bacteria will grow and destroy the plant.

It may be due to the exceptionally high temperatures, the lack of regular watering, and the lack of fertilizer management, which led to the emergence of various germs and eventually leaf blight.

Factors that cause leaf blight in coriander: 1. The density of planting coriander is too large. In the process of planting coriander, the density of planting coriander is too large, resulting in poor ventilation and lighting, and serious disease.

Or use too much nitrogen fertilizer, coriander in the growth process, the stem is very tender, the resistance is reduced, and leaf blight is prone to occur. 2. Improper selection of plots and poor field management. Soil with heavy stickiness and acidic pH was selected.

Or it is that coriander has been planted for many years, resulting in many diseases and disabilities in the field. Poor field management leads to overgrown weeds, reduced plant resistance, and easy disease. The low-lying terrain was chosen, with too much water, poor drainage, and very moist soil, which was also prone to leaf blight.

3. Improper application of fertilizer. When coriander is grown, the seeds carry germs. The application of fertilizer that is not well decomposed, or the fertilizer contains diseased residues of undergraduate crops, is easy to cause leaf blight.

4. In the process of planting coriander in the greenhouse, the temperature is too high and the humidity is too high. In the process of planting coriander in greenhouses, in order to keep warm without wind and moisture, it will cause leaf blight to occur in the planted coriander due to high temperature and excessive humidity. 5. Diseases and insect pests have occurred.

There are many underground pests and nematodes in coriander, which can easily cause leaf blight in coriander.

Summary. Coriander blight, also known as dead seedling disease, mostly occurs in the middle and late stages of coriander seedlings, and is related to factors such as high humidity, so moisture should be drained when planting, spraying R. solanacearum before and after the onset of the disease, which can play a preventive and leading role, if the disease is serious, the dosage can be increased appropriately. Spraying R. solanacearum before and after the onset of the disease can play a preventive and ** role.

1. Dilute R. solanacearum rik by 600 times, 3 liters per square meter and water the seedbed before or after sowing and before planting. 2. Irrigate the roots or flood irrigation of a small area of the diseased plants and the plants within 2 3 meters around the diseased plants; If the pathogen is harmful to the aboveground parts at the same time, the aboveground parts should be sprayed at the same time as the root irrigation, and the medicine should be applied once every 5 days.

Coriander blight, also known as dead seedling disease, mostly occurs in the middle and late stages of coriander seedlings, and is related to factors such as high humidity, so it should be drained when planting, spraying R. solanacearum before and after the onset of the disease, which can play a preventive and leading role, if the disease is serious, the dosage can be increased appropriately. Spraying R. solanacearum before and after the onset of the disease can play a preventive and ** role. 1. Dilute R. solanacearum rik by 600 times, 3 liters per square meter and water the seedbed before or after sowing and before planting.

2. Irrigate the roots or flood irrigation of a small area of the diseased plants and the 2 3 meters around the diseased plants; If the pathogen of Huinaliang is harmful to the aboveground parts at the same time, the aboveground parts should be sprayed at the same time as the root is irrigated, and the medicine should be applied once every 5 days.

2.After emergence to the early stage of the disease, the following fungicides can be used for prevention and control: 800-1000 times of 20% rusticide suspension and 600-800 times of 70% mancozeb wettable powder; 20% fluoramide wettable powder 600-800 times liquid dissipation; 400-600 times of 30% malignant nail cream aqueous agent; 20% methyl standing blind residual phosphate milk 800-1200 times liquid; Spray the plants with water once every 5-7 days.

Is there a **?

Is it the reason for the recent rainfall?

Is there a **? Have herbicides been applied to the previous crops or what pesticides have been applied recently?

Prevention and control of coriander "dead seedlings" should be taken in advance according to the specific causes of their occurrence.

1. Dead seedlings caused by the accumulation of self-toxic substances. Coriander will produce substances that are toxic to itself, and the accumulation of this substance will cause its dead seedlings to be reduced. The lighter ones can be sprinkled with 300 grams - 500 grams of micro-increasing bacteria before planting, and the stubble should be changed after two years of continuous planting.

2. Dead seedlings caused by diseases at the seedling stage. The bacterial flora in the soil is out of balance, the pathogenic bacteria accumulate too much, and the problem of dead seedlings caused by cataplexy and blight occurs. To solve this problem, you can coat coriander before planting, coat it with Gaoqiao 10ml + Yiwei 20g per kilogram of coriander seeds, sow it after drying, and pay attention to the prevention of diseases.

3. Dead seedlings caused by lack of trace elements. Unreasonable fertilization caused a lack of trace elements (boron, zinc, iron) in the plot, resulting in a decrease in coriander yield. To solve this problem, when fertilizing the land, the whole field is sprinkled with 200 grams of Euribor zinc + 50 grams of Rui Green or corresponding trace elements.

4. Dead seedlings caused by excessive use of chemical fertilizers. Unreasonable fertilizer use causes soil compaction and salinization, which makes the root system of coriander particularly shallow, reduces the utilization rate of chemical fertilizer and disease resistance, and reduces yield. After sowing, 200-300 grams of loose soil essence can be sprinkled on the whole field to improve the soil.

Are you replanted, and you will die when the seedlings emerge from the heavy stubble?

Coriander heavy stubble dead seedlings, what fungicide to use, how to treat the soil.

Coriander stubble and dead seedlings are generally caused by the invasion of pathogens in the soil, so soil treatment is the fundamental way to solve this problem. Here are a few ways you can do it: Crop rotation:

Rotate coriander with different pathogen hosts to allow the pathogen to lose its parasitic environment. Remove diseased plants and wilts: After harvesting, the remaining plants and fallen leaves should be cleaned up in time to reduce the breeding of disease.

Fertilizer application: Appropriate use of fertilizers containing high nitrogen and potassium in rows to improve soil quality, improve plant immunity, and strengthen resistance to pathogenic microorganisms. Use of effective microbial agents:

The experiment found that Pythium can effectively promote the healthy growth of coriander and alleviate the impact of heavy cropping. Other common and useful fungicides include chemical compounds such as Bordeaux liquid and myxim. Disinfect the soil:

Chemical disinfectants, hot water treatment and other methods can be used to remove pathogens, but pay attention to environmental protection requirements. After disinfection, the soil ecosystem needs to be adjusted with the help of other methods. It should be noted that different treatment methods may have different applicability and effects, and the specific choice of which method should be made on a case-by-case basis.