Mung bean leaf spot is one of the main diseases of soybean, what are the prevention and control meth

Mung beans are one of the most common grains, and in the hot summer, we will eat delicious and cool mung bean soup. Mung beans are the traditional legume food of our people. Although mung beans are good, it is not easy to plant and harvest.

Prevention and control methods of mung bean leaf spot

1. Choose varieties resistant to leaf spot. Select disease-free plants to keep seeds, soak seeds with a new high-fat film before sowing, and take them out to dry after soaking them to plant. It can keep warm, moisturize, absorb swell, improve the germination rate of seeds, and make the seedlings robust.

Repel underground pests and isolate viral infections. It can also be mixed with seed coatings.

2. Carry out deep ploughing after harvest in the affected area, and implement crop rotation if possible.

3. Pharmaceutical prevention and control. In the early stage of mung bean leaf spot disease, spray with targeted agents in a timely manner, spray once every 7-10 days or so, spray 2-3 times as appropriate according to the damage of leaf spot, which can effectively control leaf spot disease and protect mung bean growth.

4. Increase potassium fertilizer. The application of chemical fertilizers and organic fertilizers containing potassium can enhance the resistance of mung bean to leaf spot and reduce the degree of damage.

Transmission route and pathogenesis of mung bean leaf spot: Mycelium and conidia overwinter in seeds or diseased residues, and become the source of infection at the beginning of the next year. During the growing season, it is harmful to the leaves, and it expands quickly before and after flowering, and spreads by wind and rain.

Under hot and humid conditions, the conidia are re-infected many times, and a large number of pathogenic bacteria accumulate, and they are epidemic when conditions are suitable. High temperature and high humidity are conducive to the occurrence and epidemic of the disease, especially in autumn, when it is rainy, continuous cropping or off-season cultivation.

Leaf spot is an important disease in mung bean production. Leaf spot disease affects the stems, leaves, and peduncles of mung beans, and at the beginning of the disease, water-soaked spots appear on the leaves, and later expand into round or irregular yellow-brown to dark red dead spots. The center of the lesion is gray, the edges are reddish-brown to dark brown, and there is a yellow halo around the periphery of the lesion.

In the later stage, several lesions are connected to each other to form large necrotic spots, resulting in perforation and shedding of plant leaves, premature senescence and death. The output can be reduced by 10 to 30, and in serious cases, it can reach more than 50, resulting in a serious decline in quality.

The pathogen of leaf spot overwinters on the soil and plants, and the pathogen multiplies on the plants the following year, spreading by wind, rain and seeds. Mung bean can develop at the seedling stage, and the severity of the disease is closely related to temperature and humidity. The air temperature is high (25 to 28) and the air humidity spreads quickly at 85% to 90%.

When the temperature reaches 32, the disease progresses the fastest.

When choosing mung bean seeds, you should choose seeds with strong disease resistance, after planting, you should lay a layer of plastic film to keep warm and can also repel insects, spray pesticides regularly, water more but do not cause water accumulation, if there is mung bean leaf spot, it should be pulled out in time so that it can be prevented.

Pesticides can be used for control, or regular fertilization, field management, chemical control, or regular soil renovation, which can prevent various diseases.

Mung bean leaf spot is a common disease in the mung bean cultivation process. In severe cases, a large number of leaves will die, perforate, fall off, and premature senescence, resulting in the death of the whole plant, which will have a great impact on the growth of mung beans. Generally, the application of unrotted organic fertilizer, serious water accumulation in the field, and lack of cultivating and weeding operations will also induce the aggravation of diseases.

So, what are the symptoms of mung bean leaf spot disease? How can it be prevented?

Symptoms of mung bean leaf spot disease, mung bean leaf spot mainly harms mung bean, the damage site is the leaves, and mung bean is more seriously damaged from flowering and pod-setting stage. In the early stages of the disease, there are water-stained brown spots on the leaves, which expand to form reddish-brown to reddish-brown edges, with light gray to light brown near-circular spots in the middle. When the humidity is high, there is a dense layer of gray mold on the lesions, which is the conidia and conidia of the pathogen.

When the disease is severe, the plaques coalesce into patches and dry up quickly. It can be as light as 20% to 50% as heavy as 90%.

Prevention and control measures, select disease-resistant varieties, and select varieties with strong growth potential, good stress resistance, high quality and high yield for planting. Mung bean seeds should be left in the autumn maturity period, and plants with dense grains should be selected for retention. Seeds should be sterilized before sowing.

A few days before sowing, the seeds should be spread on the ground for 2 days and soaked in 45 warm water for 10 minutes. The germs carried by the seeds can be killed. Crop rotation and intensive crop rotation are the most effective ways to reduce soil pathogens.

Mung beans and gramineous crops are best rotated for more than 3 years, but beans, sunflowers, and other crops cannot be rotated. After harvest or before sowing, deep ploughing should be carried out to remove germs and reduce the source of disease in the field.

Avoid the application of immature farmhouse fertilizer, increase the application of fungus fertilizer, the application of organic fertilizer can enhance soil organic matter, improve soil fertility, but the applied organic fertilizer must be fully fermented and matured to kill the bacteria carried in the fertilizer, thereby reducing the production of bacterial sources. If conditions permit, microbial fertilizers can increase the beneficial bacteria in the soil, kill bacteria, decompose P and K elements in the soil, and provide plants with growth and development. For the prevention and control of pesticides, in the early stage of the disease, use 1000-1500 times of 50% carbendazim (carbendazim plus ethanthazim) wettable powder or 600 times of 75% chlorothalonil wettable powder, 600 times of 12% green milk copper oil, 600 times of 80% Dasheng M-45 wettable powder, 800 times of 47% Ruinong wettable powder, 500-6 00 times of 50% sulfur mixed suspension, 400 times of 30% basic copper sulfate suspension, 1.

1: 200 times Bordeaux liquid, once every 7-10 days, 2-3 times in a row.

The above are the symptoms and prevention measures of mung bean leaf spot, mung bean leaf spot is seriously harmful to mung bean, which can dry up mung bean leaves, reduce quality and reduce yield. Mung bean leaf spot is conducive to the occurrence and spread under high temperature and high humidity conditions, especially in rainy autumn, continuous cropping or off-season cultivation, farmers should pay attention.

There will be a lot of black patches on the mung bean leaves, and the area will get bigger and bigger. The shoots of mung beans will gradually dry up and turn yellow in the later stage. Mung beans will be smaller in size and will have a lower yield.

The leaves have obvious spots and yellowing marks, and the roots are relatively dark, particularly dry, and do not absorb water and nutrients, which are the main characteristics.

If you want to have a good control, in fact, the best way is to pay attention to spraying pesticides in time, and you should pay attention to timely fertilization, so as to achieve a very good control effect, and the leaves of this mung bean will grow great.

1. Choose disease-resistant varieties and plant reasonably densely to ensure good ventilation in the field.

2. Strengthen field management and pay attention to drainage or scattering after heavy rain.

3. Pesticide spray is used for prevention and control in the early stage of the disease.

Be sure to fertilize and ventilate more, and let the plants photosynthesize more, and spray some insecticides on the areas that have been bitten by bugs.

This situation is likely to be caused by the nutritional imbalance of mung bean leaves, At this time, we should supplement some water, and at the same time, we should also use some sterilizing drugs**.

Choose disease-free plants to keep seeds, before sowing should be soaked in 45 warm water, about 10 minutes can have a sterilizing effect, the diseased site should be deep ploughed after harvesting, or sprayed with 50% polymocarb wettable powder.

The seedlings with green leaf spots should be pulled out to avoid infecting other mung beans, you can water more, turn the soil frequently, and you can buy some pesticides to spray on the leaves, which can be prevented.

When selecting varieties, it is necessary to select varieties with strong disease resistance, strengthen field management, use some pesticides to prevent and control mung bean leaf spot, and carry out deep ploughing in the affected areas.

1. Symptoms.

The lesions on the leaves are light brown to grayish-white, irregular, with dark brown margins. In the later stage, many small black spots are set up on the lesions, and finally the leaves die and fall off.

Second, the law of occurrence.

The pathogenic bacteria overwinter on diseased plants with ascospores. The following year, it was spread by wind and rain, and the first dipping was carried out. Leaf spotted disease mostly occurs in the late growth stage of soybean, causing early defoliation of soybean.

3. Prevention and control methods.

Remove diseased plants and turn the soil deeply. At the beginning of the disease, 50 times of Fumei double wettable powder was sprayed for prevention and control.

At first, small water-stained spots appear on the leaves, and then expand into round or irregular brown spots, causing the plant to dry up and lose its leaves. At the early stage of the disease, Hu Heze selected 700-800 times of 85% mancozeb wettable powder, or 400-500 times of 50% carbendazim wettable powder, 250-500 times of 40% carbendazim suspension, and 600 times of 70% methyl tobuzine dispersible wet powder, and mixed foliar fertilizer spraying had a synergistic effect.

You can water and fertilize in time, and you should also choose phosphate fertilizer and nitrogen fertilizer, and you should also prescribe the right medicine, spray some pesticides in time, and should also prepare the base medicine according to the proportion.

Select disease-free seeds, collect seeds from disease-free land, soak the seeds with 45 constant pulse warm water for 15 minutes, remove them and then move them into cold water to cool, or use 95% dixone original powder or 50% Fumei double seed dressing with 95% dixone powder or 50% Fumei double seed dressing with the weight of the seeds, or soak the seeds with 500 times of streptomycin sulfate for 24 hours. Learned.

The more common pests and diseases of mung bean include root rot, virus disease, brown spot, leaf spot, powdery mildew, small ground tiger, red spider, and aphid.

The common pests and diseases that occur in mung beans are virus diseases, leaf spots, and root rot, which can affect the growth of mung beans and also affect the yield of mung beans.

The main diseases of mung bean are leaf spot, anthracnose, gray mold, powdery mildew, root rot, sclerotia, sclerotia, virus, rust, wilt, etc.; The main pests are leaf beetle, nuclear leafhopper, cinnabar leaf mite, truncated leaf mite, cotton borer, spotted bee, mung bean borer, kidney poison moth, bean leaf tassel, three-spotted borer, silkworm and so on.

Bean pod borer, ring pattern disease, leaf spot disease, these are the main pests and diseases of mung bean, which need special treatment to restore vitality.

Introduction: Red bean is a very common crop on the table in many family life, there are many ways to live red bean, and it has improved economic value and medicinal value, in recent years, the planting area of red bean has gradually expanded, but it will be affected by many pests and diseases during its growth and development. Let's take a look at what are the common diseases of red beans, a legume crop?

1. Red beans. Red beans belong to the annual plant, red beans are planted in many regions and plain and hilly terrain areas in China, and they are also very common in the market, and they are also very cheap, and many families can afford them. Moreover, the growth period of red beans is short, so it is often used as the main crop for stubble and stubble, but with the continuous expansion of red bean planting area, the frequency of its pests and diseases continues to increase, and the severity also increases, which must be controlled, otherwise it will seriously affect the yield of red beans. <>

Second, the problem of disease.

There are many causes of plant diseases, these diseases will affect the rhizome or fruit of red beans, and if they are not managed in a timely and effective manner, they will lead to a reduction in the yield of red beans in the current year, and farmers will have no economic income. The incidence of rust is higher in rainy and foggy seasons, and the earlier the sowing period, the more severe the onset of rust. If the humidity in the field is high, the fungus will germinate, and once the fungus appears, the epidemic rate is extremely fast, especially when the conditions of high temperature and drought and high humidity alternate, the pathogen will be widespread in a large area.

3. Pest problems.

There are many kinds of main insect pests of red beans, most of them are some harmful insects, gnawing on the leaves or fruits of red beans, so that many red beans have become bad seeds, some pests will threaten the yield and quality of red beans, especially in summer, it will threaten the normal growth of red beans, and in serious cases, it will also threaten the yield and quality of red beans, and they will be inedible or even no harvest. Aphids will suck the sap in the red bean leaves, causing leaf lesions, affecting leaf photosynthesis and causing lodging of red bean rhizomes.

Common pests and diseases are, red bean rust, red bean spot, aphids, pod borer, bean elephant and so on, so when planting red beans, we must do a good job in the prevention and control of pests and diseases.

Common diseases are powdery mildew, viral disease, horn spot, pod borer, spider mite, aphid. These are all common diseases of red beans.

The first is rust, which is also a fungal type of disease; Then there is powdery mildew, there is mosaic disease, and then there is also horn spot disease, so it must be done in time**.

Beans are planted in greenhouses with a variety of pests and diseases, which will bring problems such as soybean yield reduction, common diseases include rust, virus disease, wilt and so on.

Rust, blight, powdery mildew, leaf spot, mosaic, anthracnose, root rot, sclerotinia and arbuscular disease.

A common pest and disease of this legume crop is that it is prone to aphids.

If pesticides can be metallurgized, the roots are poisonous.