Cotton wilt is a common disease during the cotton planting period, what is cotton wilt?

shrinkage; When the seedlings grow 3 to 5 true leaves, the young leaves at the growth point are shriveled and deformed, and the mesophyll is blister-like and convex, and the symptoms are very similar to the damage of cotton aphid, but there is no cotton aphid on the back of the leaves, the internodes of the plant are shortened, the leaf color becomes darker, and generally does not die, and it is often mixed with the yellow reticulation type. Do a good job of quarantine and protect disease-free areas. Quarantine is an effective measure to prevent problems before they occur.

When transferring seeds, it is necessary to carry out the procedures for the allocation and quarantine of seeds. Cotton seeds in the sick area should be disinfected first, and the cotton seeds in the isolation area should be planted for one year to prove that there are no pathogens before they can be planted in the disease-free area.

Some plants are sick on one side, but the other half can still grow, forming half wilting. Severely diseased plants die early, and mildly diseased plants can survive with disease, but the yield is seriously affected. The stems, petioles, and ducts at the roots all turn brown.

If it rains heavily in autumn, a pink mold layer is formed on dead stems and nodes. Cotton topping time should be determined according to the specific situation of the growth of cotton fields, the cotton fields with weak growth should be topped early, and the cotton fields with more vigorous growth should be topped later, but all cotton fields should be topped before August 15.

Cotton yellow wilt is the most likely disease of cotton after topping when growing into an adult plant, and yellow wilt is extremely harmful to cotton, which can cause a large number of dead seedlings of cotton and dead plants. Pay attention to the application of phosphorus and potassium fertilizers, at this time the absorption of cotton phosphate fertilizer and potassium fertilizer reaches its peak, which is the maximum absorption and utilization period of cotton for phosphate fertilizer, if there is a lack of phosphorus at this time, it will have a very serious impact on the yield.

The disease is characterized by the appearance of light yellow leaf spots between the leaf edges and leaf veins of the lower leaves of cotton at the beginning, and then slowly spread, the leaf color gradually becomes lighter and the mesophyll will become thicker, the edge is curled downward, and the leaves will slowly fall off from the bottom to the top, and finally only a few leaflets on the top of the plant remain, and the cotton will be scarce and will split in advance. If you are yellowing and wilting, you can use carbendazim twice to see if you have blight. There are also insect infestations, such as concentration insects and cotton spirit insects.

I took the medicine for three days in a row.

This is a common disease of cotton, the pathogen is a fungus, after infection, it will cause the leaves to die or fall, and the whole growth cycle of cotton is prone to cotton wilt, so we should pay attention to prevention and control.

Cotton wilt is a common disease during the cotton planting period. The pathogen is a fungus, Fusarium oxysporum (wilting specialized type), which mainly harms the vascular bundles and other parts of cotton, causing leaf death or falling off. Depending on the location of the hazard, it can also be referred to separately by different special names.

The disease can be prevented by spraying pesticides or planting management.

<>The pathogen of cotton wilt is Fusarium oxysporum, and the causes are:

The soil temperature is high (the onset of the disease starts at 20 o'clock, and the peak of the disease occurs at 25-30 o'clock).

If the soil moisture in the field is too high, it is conducive to the multiplication of pathogens, which can aggravate the disease.

Nematodes in the soil are very harmful.

Cotton itself is less resistant to disease. 5. Before sowing, deep ploughing and deep ploughing were not carried out, the base fertilizer application was insufficient, the fertilization was unreasonable, and the plant growth was weak.

1. Cotton wilt pathogenic bacteria

The causative bacterium of cotton wilt is Fusarium oxysporium.

2. Causes of cotton wilt

1. Temperature. (1) When the soil temperature rises to about 20, the disease begins to occur in the field, and then the disease gradually worsens with the gradual increase of soil temperature, until the soil temperature is 25-30, forming the peak period of cotton wilt disease.

2) When the soil temperature rises to 33-35, the disease stops developing, but when the temperature drops in autumn, there will be a second peak of disease in cotton fields.

2. Humidity. When there is more rainfall and the rainwater is evenly distributed, and the soil moisture is large, it is conducive to the reproduction and expansion of pathogens, and the disease is often more serious. When the rainfall is less and more concentrated, the onset is milder.

3. Cotton varieties.

Different types and varieties of cotton vary in their resistance to cotton wilt. In general, the disease resistance of cotton is stronger than that of upland cotton, and the disease resistance of kapok and island cotton is weak, and it is easy to be infected with the disease.

4. Soil nematodes.

1) Soil nematodes are the vectors of cotton wilt bacteria, which can help spread the pathogens, thereby increasing the probability of infection with cotton wilt.

2) When soil nematodes feed on cotton roots, they not only cause damage to cotton roots, which provides an opportunity for pathogens to invade, but also leads to a decrease in disease resistance of cotton plants, which further increases the possibility of infection with cotton wilt.

5. Field management.

1) The low-lying terrain, poor drainage conditions, and high humidity in the field are easy to cause cotton wilt.

2) The pathogens are mainly distributed in the soil layer about 20cm below the surface, if the cotton is not planted before deep ploughing, it will lead to the accumulation of more and more germs, thereby aggravating the disease.

3) Insufficient application of basal fertilizer and unreasonable fertilization lead to poor plant growth and weak disease resistance, thereby increasing the probability of infection.

The same plant can exhibit one symptom type, or sometimes several symptom types, with seedlings of the yellow reticulated, yellow, and purplish-red types becoming shorter if they do not die. Regardless of the type of symptoms, the vascular bundles of the roots and stems of the diseased plant turn dark brown. At present, the area of disease-free areas in China is still large, and the introduction of cotton seeds from diseased areas to disease-free areas should be controlled.

When it is necessary to introduce seeds, disinfection treatment should be carried out, and after the seeds are depiled with sulfuric acid, they should be soaked with antibacterial agents for half an hour, or disease-free farming fields should be established, and disease-free cotton seeds should be selected and preserved.

Cotton will have yellowed branches and leaves, leaves fall, no flowering, cotton texture is fragile, and the leaves are rotten; If you want to prevent cotton wilt, you must prevent diseases and eliminate disasters for cotton in time, water them on time, clean up the surrounding weeds regularly, and spray a certain concentration of nutrient solution on time.

The symptoms are that the cotton will wilt, the branches of the cotton will die, the cotton will also turn yellow, and the growth of the cotton will be limited. The method of prevention and control is to treat the branches of cotton with insect pests when planting cotton.

If there is concentrated water at the roots, the leaves will turn yellow and fall off, and there will be many small black spots on the leaves, and the cotton will not grow much. Spray some pesticides for this disease, and it can be cured.

Cotton can be said to be an important export crop in our country, of course, we are inseparable from cotton in our daily life.

For example, the clothes we wear every day, the quilt that we have to cover every day to sleep are all made of cotton, and the cotton we see is white, but this is after a lot of processing procedures before it becomes like this, and the process of planting and cultivating cotton is also very difficult, from the beginning of planting, it needs to be watered regularly and weeds are treated. <>

In addition, the most important point is the prevention of pests and diseases, cotton is easy to get pests and diseases, once you get this disease, it will reduce the quality of cotton.

The things that lead to it are not so comfortable, so we should be clear when planting cotton which kinds of pests and diseases and common pests and diseases cotton may have, and how to prevent and control it, blight is the most common pest and disease, and the most serious impact on cotton, but when it occurs, we can observe it in time, and give specific treatment measures, another disease is Verticillium wilt. <>

As the name suggests, it refers to the appearance of yellow spots on the leaves.

Although it is not as severe as blight, but if it is not managed, the disease will only spread more and more, and eventually lead to the death of cotton, or the cotton is very poor, the insect pests mainly belong to cotton aphids and cotton bollworms are the most prominent, if you get cotton aphids, then cotton aphids will absorb the nutrients of seedling leaves, resulting in leaves can not develop well. <>

The fruit will affect the time of cotton flowering and the amount of cotton seeding, and the cotton bollworm is even more severe, it will eat some cotton buds, resulting in cotton not being able to flower. Therefore, when planting cotton, it is not okay to plant it, but it is still necessary to manage it diligently, maintain it, pay attention to pests and diseases, take appropriate methods of planting, and prevention and control are very important means, if you want cotton to grow well, you must spend corresponding energy.

The most common diseases are black root disease, rotten root disease, blight, black spot, etc., these are the most common diseases, and will affect the yield of cotton, and these pests and diseases are very serious.

Cotton soft auxiliary diseases, cotton leaf burning, cotton ring disease are all common diseases of cotton, for the influence of weather and temperature, too many pests, cotton is prone to these diseases.

The common diseases of cultivated cotton mainly include root rot, black root disease, wilt, black rot, virus disease, and stem blight, which are relatively common diseases, and should be dealt with in time once found, otherwise it will affect cotton yield.

Fusarium wilt is the most common pest and disease, and the most serious impact on cotton, but when it occurs, we can observe it in time and give specific treatment measures, and the other disease is Verticillium wilt.

Standing blight, anthracnose, red rot, cataplexy, root rot, cotton red leaf stem blight, cotton blind bugs, etc.

The first is to choose varieties with strong resistance to pests and diseases, the second is to spray drugs to control pests and diseases, the third is to ensure sufficient light, the fourth is to water on time, and the fifth is to choose the right soil.

It can be carried out in a timely manner for the problems that occur in cotton. The management method is to use some drugs for prevention, use some pesticides for prevention and control, prevent in advance, and solve problems through professional means.

Be sure to use disease-resistant varieties. This is crucial, but since the general characteristics of disease-resistant varieties are a bit late, and there are few early-maturing and disease-resistant varieties, high-density dwarf management measures should be adopted according to their characteristics when planting disease-resistant varieties.

We must do a good job of prevention, ensure soil fertility, water and fertilize in time, control temperature and humidity, use pesticides and fertilizers regularly, and be sure to prescribe the right medicine.

Fusarium wilt is a bacterial disease that occurs suddenly on a large scale, and it is generally determined that yellow wilt is viral, which begins with only a few plants, and is usually transmitted by stinging insects before gradually and rapidly infecting. What can't be treated with antibacterial spray is usually a virus. Information in WeChat.