One of the important diseases of coriander leaf spot, what is the harm of leaf spot to coriander?

The main harm of coriander leaf spot, leaf spot disease begins to produce brown lesions on leaves, petioles and leaves, irregular or nearly round lesions, the edges are particularly clear, and there are small black particles on the lesions, which is actually the pathogen, after the onset of the disease, it can lead to the drying of leaves, and the coriander loses its use value. Pathogenesis of coriander leaf spot: Generally speaking, leaf spot is easy to occur under the conditions of high temperature, rain and humidity, through the production and germination of roe deer, and directly from the epidermis after the emergence of bud tubes.

<> general climate change, the large temperature difference between day and night leads to poor plant growth and reduced disease resistance, which will further promote the occurrence of the disease. Coriander leaf spot is a bacterial disease, which can be prevented and treated with drugs, and the pesticide bimycin 20 30 ml can be selected, and 40 kg of water is added to spray foliar spray, once every 3 days, for 3 consecutive days. You can also use quicklime water, foliar spraying, once every two days, for a week.

You can also soak ten catties of plant ash in water and spray fertilizer on the foliage.

There are many pesticides used to control leaf spot in coriander. This is because, in order for vegetables to be marketed, toxic pesticides and substances with small residues cannot be used. If coriander leaf diseases are how **, because modern pesticides are composed of highly toxic chemical components, the poisonous plume stays for a long time, and after eating, it is not good for human health and harmful to the physique.

Therefore, in addition to vegetables such as coriander leaf disease, you can also soak the finger pepper in a bucket of water to reach a certain concentration, which can get rid of pests such as leaf disease. Finger pepper soaked in water, moderate concentration, has a unique effect on vegetables in addition to pests and diseases, and does not affect the growth of vegetables, harmless to the human body, eat this whether it is coriander or other vegetables, are more beneficial to the body, and pesticides and insecticides are completely different. The above is for reference only, and it is better to experiment.

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The harm to Hunan cuisine is very great, because this is likely to lead to a decrease in the yield of coriander, and then it will also affect the speed of growth and development, and there will be pests and diseases, or there will be rot, and it may also lead to root rot.

Leaf spot may cause the coriander leaves to quickly turn yellow and fall off, the coriander root system will rot, and there will be serious disease transmission, so that the quality of the coriander will gradually decline, and the coriander will grow slowly, and a large number of scabs will appear.

It will produce irregular spots on the leaves, which will cause the leaves to die, lead to the death of a large area of coriander, affect the yield of coriander, affect the appearance, and affect the edibility.

Let the coriander no longer be green, the color is yellow, wilted, there are many spots on the coriander leaves, the yield is very low, and the case fatality rate is very high.

The risk to Hunan cuisine is very large, because it may lead to a decrease in the yield of coriander, and then it will also affect the rate of growth and development, and there will be pests and diseases, or there will be a rotten environment, and it may or may lead to rotten roots.

During the growth of coriander, if its leaves appear curled and wilted, it is actually coriander leaf blight.

First: the factors that lead to the occurrence of coriander leaf blight

1. The density of planting coriander is too large.

In the process of planting coriander, the density of coriander planting is too large, resulting in poor ventilation and lighting, and serious diseases. Or use too much nitrogen fertilizer, coriander during the growth process, the stem is very tender, the resistance is reduced, and it is prone to leaf blight.

2. Improper selection of plots and poor field management

Choose soil with heavy stickiness and acidic pH, or plant coriander with heavy crop for many years, resulting in more disease residues in the field. Poor management in the field leads to the growth of weeds, reduced plant resistance, and susceptibility to diseases.

Choosing low-lying terrain, excessive water accumulation, poor drainage, and very moist soil are also prone to leaf blight.

3. Improper use of fertilizer

When planting coriander leaves, the seeds carry diseases. Leaf blight can easily be caused by the application of immature fertilizers or fertilizers with residues of this crop disease.

4. The temperature and humidity are too high in the process of growing coriander in the greenhouse.

In the process of planting coriander in greenhouses, in order to keep warm without letting wind and moisture drain, it will lead to leaf blight due to high temperature and excessive humidity.

Clause.

2. Measures to prevent coriander leaf blight

1.Clean up before sowing.

Before sowing coriander, remove weeds between the planting plot and the plot, concentrate on burning or composting; Deep ploughing of the soil is carried out to remove stubble, dry the land, and allow the leaf blight residue to decompose, so as to prevent and reduce the source of diseases and insects.

2.Choose good seeds.

Choose virus-resistant seeds, use coated seeds, or if uncoated seeds are used, sterilize the seeds with seed mixture or infusion.

3.Choose a good plot.

Choose fields with convenient drainage and irrigation, and leave drainage ditches to reduce the groundwater level, so that there is no stagnant water after the rain stops; It is an important measure to prevent leaf blight and disease by cleaning the field furrow system in time after heavy rain to prevent water retention in the field and reduce the humidity in the field.

For single-incidence areas, chloropicrin can be used, i.e. two to five millimeters of chloropicrin can be applied every thirty-two cm to ten to seventeen cm deep, covered with soil when used, the seedbed is covered with mulch after all use is completed, and the seeds are planted after two weeks.

4.Apply well-rotted organic fertilizer.

Apply well-rotted organic fertilizer, do not use fertilizer with germs. The applied organic fertilizer should be well rotted and must not contain disease residues from this crop.

It may be that the soil has no fertility, there may be a lack of water, there may be a lack of fertilizer, there may be a relatively high temperature, there may be pests and diseases, we must water and fertilize in time, and we should also ensure soil fertility, and use pesticides and fertilizers.

It can be due to malnutrition, it can be caused by too much watering, it can be due to rotting roots, or it can be caused by some disease. It can be controlled by some drugs, and some pesticides can also be used for prevention and control.

The causative agent of coriander leaf spot disease is mainly mycelium latent in the seed coat or left in the soil for overwintering with the diseased residue. The mycelium latent in the seed coat can survive for more than 1 year and can be transmitted over long distances. The pathogen spreads through wind and rain, farm tools and agricultural practices.

In conditions of high humidity and water droplets, pathogens invade through the stomata or directly through the epidermis. Nitrogen, phosphorus and potassium (20, 20, 20) water-soluble fertilizer plus humic acid active liquid fertilizer or amino acid active liquid fertilizer plus biological bacterial fertilizer were applied to the roots.

Coriander is called coriander or coriander in many rural areas, and it is a delicate vegetable with a special fragrance. It can be planted all year round according to market demand and ****. The whole growth period is not long, so it takes fifty or sixty days, and at most no more than seventy days can be completely harvested and marketed to obtain planting income.

The appearance of black spots on coriander leaves is a black spot disease, and the black mold layer is a spores of the fungus. Foliar sprays of natural brassinin plus humic acid active liquid fertilizer plus potassium dihydrogen phosphate. Every 7 to 10 days, 2 to 3 times in a row.

In order to promote the roots to take root and strengthen the roots, promote the seedlings to grow seedlings and strengthen the seedlings.

Strengthen field management, time seedlings, hoeing, pay attention to ventilation and light transmission, reduce field humidity, and strictly prohibit flood irrigation; In the growth stage of coriander, spray strong stems in a timely manner to make the plant stem thick and the leaves hypertrophied, improve the disease resistance of coriander, reduce the amount of pesticides and fertilizers, reduce residual toxicity, and improve the natural taste of coriander. The leaves fall into the soil for overwintering. In the following year, when the temperature is suitable, the spores invade the host, and then the spores are transmitted to more host plants by wind and rain.

The lower leaves of the plant are severely diseased. High temperature, humidity and poor ventilation are conducive to the occurrence of diseases. The disease is more severe when the plant growth is weak.

Root rot mainly occurs in low-lying and humid areas, mainly harming the roots of coriander, which will be brown, rotten, and have almost no branches. With a slight pull of the hand, it will break, and this kind of coriander will lose its commercial value. Try not to reduce parsley yields due to moisture.

The cause of the disease is usually due to the presence of pathogens in the seeds, so the seeds should be sterilized before planting. For the management of seeds, it is necessary to strengthen the ventilation and drainage of coriander fields. If the disease is found, it can be sprayed with mancozeb and other agents for prevention and treatment.

When this leaf spot disease occurs in coriander, spray 1000 times of 50% Lide wettable powder, and the effect of this method is also very good, which can improve this symptom.

It can be controlled with targeted agents such as Lide WP, synergistic Ruifufen WP, chlorothalonil WP, etc., and can also be used to enhance the efficacy of the drug by spraying the new high-lipid film doubling liquid, improve the utilization rate of the active ingredients of the agent, and consolidate the control effect.

I think we should spray some pesticides in time, and we should also spray some bactericidal agents, and we should also ensure that the light is sufficient, the permeability of the soil should be ensured, and the management of water and fertilizer should also be done.

1. Reasonable seed application, choose disease-free seeds. 2. Strengthen field management, time seedlings, hoeing, and pay attention to ventilation and light. 3. For the prevention and control of pesticides, spray 50% Lide wettable powder, 40% synergistic Ruifuxin wettable powder, 75% chlorothalonil wettable powder and other targeted agents according to the requirements of plant protection in the early stage of the disease, and cooperate with the spraying of 800 times the liquid of the new high-lipid film to enhance the efficacy, improve the utilization rate of the active ingredients of the agent, and consolidate the prevention and control effect.

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.

It is mainly the formation of black spots on the leaves, which affects the growth of crops, which is caused by bacterial infection. This can be solved by a reasonable crop rotation, with disease-free seeds and drugs**.

It hurts the leaves, rhizomes, and petioles. The initial condition of the disease is that the leaves are brown with some small irregular spots. Slowly, these spots will become larger and become small black grains, which is a symptom of this disease.

Coriander leaf spot disease is mainly harmful to leaves, petioles and stems, the leaves are infected with the initial olive to brown, irregular or nearly round small lesions, the edge is obvious, after the expansion of **gray, the lesions are covered with small black spots, severe, the lesions are fused into pieces, causing the leaves to dry up.

Coriander leaf spot is mainly characterized by leaves, petioles and stems. The leaves are infected with olive to brown, irregular or nearly round small lesions, the edges are more obvious, the expansion is **gray, and the lesions have small black spots.