Salvia leaf blight occurs frequently, what are the symptoms of salvia leaf blight?

It will be on the leaves, and at the beginning, there will be brown round spots on the leaves, and as the situation gets worse, the spots will spread larger and larger, and they will slowly spread to the top.

The symptom is that the leaves will wilt, there will be black-brown spots on the leaves, black spots will also appear on the crown, the color of salvia will also become very light, and spots will also appear on the salvia, which is the symptom of salvia leaf blight.

There will be some brown spots on the leaves, the range of the disease will become larger and larger, the leaves will wilt, and it will also cause the plant to die, which will affect the quality of salvia, and will cause a large number of leaves to die.

Mainly partial application of nitrogen fertilizer, thus ignoring the application of organic fertilizer and micro fertilizer, the concentration of stagnant water solution is too large, and the root burning is completed and the absorption is affected Because the tillage layer is too shallow, the soil compaction of the lower layer, rain or after watering, the water can not penetrate in time Leaf blight is a more common disease of garlic planting, especially garlic cultivated in the open field is the most prone to this disease. As the name suggests, garlic leaf blight mainly damages the leaves of garlic. In the early stages of the disease, the leaves will have small white dots starting from the tip of the leaf.

At the beginning of the disease, the flower white small round spots appear from the tip of the old leaves, and then expand into irregular or oval gray-brown lesions, and when the air humidity is high, it is often purple-black and even black mold appears (conidia begin to spread), pesticide control: 70% ethphosphine aluminum-manganese-zinc wettable powder can be used 500-700 times, used once every two weeks. In addition, you can also choose 5% chlorothalonil wettable powder 500 times liquid, 12% green milk copper emulsifiable concentrate 600 times liquid spray 2 3 times.

When applying base fertilizer, try to choose potassium sulfate compound fertilizer, and increase the application of organic fertilizer or biological fertilizer, when planting garlic, reasonable dense planting! Can't be planted too thick! In spring, the disease begins when the temperature reaches 12 degrees, a large number of lesions begin to be produced at 18 degrees, and the incidence is less common when the temperature is lower than 8 degrees or higher than 35 degrees.

Low-lying land, poor drainage, insufficient nitrogen fertilizer, phosphorus and potassium application, poor management, and weak growth are prone to disease. <>

Spread upwards for damage, the lesions are irregular or oval, gray-white or gray-brown, the diseased part has high humidity and black mold, and the leaves are seriously dead. Flower peduncle damage, the disease is easy to break the disease caused by many factors, each kind of disease is manifested on the top of the leaves, sometimes some experts and it is difficult to distinguish, not to mention our garlic farmers, so we should adopt a comprehensive approach to prevention and control, and do prevention in advance, strengthen field management. After the harvest of the last garlic crop, it is necessary to remove the diseased and residual plants in the field in time and take them to a place far away from the field for centralized destruction, so as to effectively reduce the number of pathogens in the land.

Prevention and control methods: 1Choose healthy seeds and use 1:1:before sowing

Soak seeds in Bordeaux liquid at 1:100 for 10 minutes. 3.

Increase the application of phosphorus and potassium fertilizers to enhance the resistance of plants to end diseases, and timely ditch drainage after rain to reduce field humidity. 3.Pharmaceutical prevention and control.

At the beginning of the disease, 50% carbendazim 600 times liquid, 65% zebsen 600 times liquid and other agents were used to spray 2 3 times continuously at an interval of 10 to 15 days.

You can buy some pesticides for spraying, and these pesticides can also play a good control effect, and it can also reduce a certain amount of yield loss.

According to the data, in the early stage of the disease, you can choose 50% carbendazim 600 times liquid, 65% zebsen 600 times solution or 50% zebzeb 500 times liquid and other agents spray, with an interval of 10 to 15 days, spraying 2 3 times in a row.

You can renovate its soil, then pour more fertilizer on its soil, and then water it more water and fertilizer at ordinary times, so that it can be well controlled.

Serious problems can arise on the leaves, grayish-brown spots will appear, black mold will appear, leading to the death and wilting of the plant.

Usually there will be very severe spots, and then in the early stage they are usually brown or round spots, and the rate of spread will become faster and faster, and then it will also affect the plant.

The leaves will turn yellow, and the branches and leaves will be very susceptible to wilting, and some spots will grow.

Pay attention to drainage during the rainy season; Take turns; In the early stages of the disease, irrigate the soil 800-1000 times with 50% Tobzin. When the water cycle is used for soil preparation, 1,500 kg of lime nitrogen is used per hectare of soil treatment. Initial spraying of 1500 times 50% Forsima EC or 600 times 50% carbaryl EC can be controlled.

Spodoptera liturae larvae bite leaves, often in summer and autumn. Control method: Spray 90% trichlorfon 800 times solution.

When young, use a 40% dimethoate 1500 solution.

According to the symptoms of the diseased plant provided by the farmer: the leaves are irregular, containing chlorine, the leaf veins are normal, the leaf tips or leaf margins are partially dry, and the overall growth of the plant is not vigorous. Not all yellow leaves or diseased spots are leaf diseases, malnutrition, climatic factors, root diseases, or pests and diseases can damage the root system, potentially inducing "disease" in the leaves.

The hair roots of salvia are normal, while the hair roots of "diseased" salvia are significantly smaller. Now, the root cause of the damage has been found.

<> due to the dry weather and lack of water in the soil, the corn stalks, which have not yet completely decayed, continue to mature in high temperatures, and the heat it produces is enough to "burn" the limited capillary roots of Salvia. The use of traditional intercropping and weed planting methods can not only remove weeds, reduce the excessive consumption of nutrients by weeds, but also loosen the soil in time, improve soil permeability, improve soil water retention capacity, and blindly select herbicides.

In particular, the farmland where straw is returned must be dominated by organic fertilizers, supplemented by means and trace elements (it is not recommended to apply macro-element fertilizers at low dosages). High nitrogen and potassium fertilizer was applied at the sowing stage, and high potassium, potassium, nitrogen and phosphorus compound fertilizer was applied in the middle and late stages. Chemical control can promote the normal growth of salvia, apply 45% methalene 20 grams or 68% oxazole 30 grams + 30 ml of humic acid fertilizer or 10 grams of algorithm foliar fertilizer + 10 ml of brassinolide butyrate per mu, and evenly spray 30 kg of water.

In recent years, fragrant aconite has become a malignant weed in the field, although fragrant aconite is also a kind of traditional Chinese medicine, but it grows in the field of salvia, and it has become a weed that must be eradicated by rural growers.

In this case, it is necessary to spray more pesticides in the land, or to spray insecticides, so that it can be prevented.

Some sterilizing drugs should be used, because only in this way can it be better prevented, and more nutrient solution and water should be added later.

Pesticides. Because pesticides can be a good way to prevent and control various diseases, pesticides should be used to prevent and control them.

Introduction: After the epidemic in China, more and more Chinese people have realized the benefits of traditional Chinese medicine, more and more medicinal materials, merchants have begun to plant medicinal materials, and the cultivation of medicinal materials is not an overnight thing, medicinal materials need to grow for many years, and the more medicinal materials that have grown for many years, the higher the economic value and medicinal value. Salvia miltiorrhiza is also a traditional Chinese medicine in China, and it can be seen in many prescriptions of medicinal materials.

1. Salvia. It has its distribution in many areas of our country, its height is about 50 centimeters, the roots are slender and cylindrical, the outer skin is vermilion, its stems and leaves are about 4, the top leaflets are larger than the lateral leaves, the key leaves are brown or black after the wood is fully ripe, it matures from June to November every year, it often grows in some sunny hillside grass or on the side of the road, the more people don't care about inconspicuous places, such as the ditch side of the roadside, the adjacent stone crevices can see his figure. <>

2. Pest control.

The main insect pest of salvia is aphids, which is the most familiar thing for many farmers, and the main place where these insects eat is in the stem and leaf part. For these bugs. Farmers have some soil methods when they are here, deep ploughing of the land in winter, if they find pests and diseases, they should spray pesticides once a week, especially in summer and autumn, the frequency of eggs and pests is higher, and the leaves must be dealt with in time.

3. Prevent diseases.

Salvia miltiorrhiza has many uses as a medicinal use, but can not be used casually, salvia will face some pests and diseases in the planting process, the most important is root rot, because the roots grow below the surface, most farmers can not see, the roots will rot because of too much stagnant water will also rot because of the gnawing of pests and diseases. In normal times, you must pay attention to the drainage of salvia, and it is best to find a higher ground and a dry place for planting.

The prevention and control measures are to sprinkle some pesticides when planting, fertilize when planting, and also sprinkle some insect repellent drugs when planting, and also fertilize salvia in the process of planting, and also control the growth temperature and humidity of salvia, so that it can be well controlled.

The prevention and control measures are to choose the pest-resistant salvia to sow seeds, the second is to add pesticides appropriately, spray them on the rhizomes and leaves of salvia, and the third is to water less, so that bacteria will not breed and diseases can be controlled.

In the process of salvia growing, timely watering, timely fertilization, spraying pesticides to prevent pests and diseases, timely supplementation of light, and mastery of several key periods for supplemental nutrition.

The first is to replenish fertilizer in time, and it must be fertilized in time, and it also needs to be watered in time, and then it is also necessary to strengthen field management, and then you can also choose to spray some pesticides.

We must pay attention to the density of planting, we must control the humidity of the soil, we must ventilate in time, we must also pay attention to the intensity of light, we must top dressing in time, and we must also deal with pests and diseases in time.