Watermelon seedlings are most likely to have seedling cataplexy, how can we prevent and control it?

Disease-resistant varieties are selected and grafted and cultivated. It is the main method to prevent and control watermelon wilt in multi-year continuous cropping area by selecting watermelon varieties with high yield, high quality and strong disease resistance suitable for local planting, and using black-seeded pumpkin that is resistant or immune to watermelon wilt as rootstock for grafting cultivation.

If this happens, the best thing to do is to pay attention to watering and fertilizing, otherwise it will definitely die in the end, and it will become very wilted, and you should also pay attention to the renovation of the whole soil.

To improve soil temperature, ventilation and humidity, and at the same time to enhance the disease resistance of seedlings, once it is found that the melon seedlings have wilted, they will be sprayed with 64 frost spirit manganese zinc wettable powder 500 times.

At this time, you should water the watermelon more and ensure the healthy growth of the watermelon, so as to prevent such a situation.

Cataplexy occurs at the seedling stage of watermelon. Infected with cataplexy, once the disease occurs in the seedbed, it will collapse one piece. At first, the stems of the seedlings that were allowed to be allowed were water-stained lesions, and slowly, the diseased parts turned yellow-brown until they dried up and shrunk into threads.

When it is damp, white mold will appear in the diseased area. Even before the seedlings emerge, the germ and cotyledons have already turned brown and rotted and died. Use 10 grams of 50% carbendazim wettable powder per square meter, add 10 to 15 kg of fine soil, mix well, and prepare medicinal soil.

When sowing, 1/3 of the medicinal soil is used as the bedding soil, the seeds are sown on the cushion soil, and the remaining 2/3 is used as the covering soil, and the seed buds are sandwiched in the protective layer of the medicinal soil by using the method of laying the upper cover.

The first point is that it will appear this phenomenon of having a lot of insects on it, the second point will have a lot of red spots, which is very scary, the third point will have a lot of green spots This small dot is also very scary, and the fourth point is that the scientific medicine should be sprayed with pesticides like 670.

In the production of watermelon, there is a more serious soil-borne disease, which is blight, which is caused by Fusarium oxysporum infection, and the entire growth period of watermelon will occur, and watermelon growers can be said to be deeply affected.

Watermelon seedlings died of wilt after being infected with wilt, which was similar to the symptoms of blight. After colonization, the base of the infected wilt stem is shrunken, with brown lesions, and white mold or amber-like objects are born in the diseased area. The pathogen mainly destroys the vascular bundles, peeling off the stems and turning brown the vascular bundles, and the roots also turning brown and rotting.

Due to the fact that farmers plant watermelons on the same land for many years, there is more accumulation of pathogens in the field, and the survival time of the wilt pathogens in the soil is very long, resulting in frequent occurrence of wilt in the field, which seriously affects the development of the watermelon industry and restricts the yield of watermelon to a certain extent. Now let me talk about the prevention and control methods:

1. Choose disease-resistant varieties.

In recent years, the development of watermelon disease resistance breeding has also been relatively fast, and some varieties are still very good resistant to Fusarium wilt. For example, Zhengkang No. 1 and No. 2, No. 2 and No. 3 of Jingkang, etc., in the continuous cropping production area of watermelon, the selection of planting these varieties in the area with serious Fusarium wilt infection can effectively reduce the degree of infection with Fusarium wilt.

2. Do a good job of seed and soil disinfection.

Before sowing, the seeds can be disinfected and sterilized, for example, soaking seeds with 50% carbendazim 500 times solution for 1 hour can kill the pathogens on the surface of the seeds, or you can choose Trichoderma harzianum soaking; When raising seedlings, choose the soil that has not been planted with melon crops within 3 years, mix the soil with carbendazim degradable powder or use the soil with oxazim, or use formaldehyde to bury the disinfection and sterilization. Choose the soil for planting, if it is planted in a greenhouse, it is best to sterilize the shed in advance or turn the ground in the high temperature season, and sterilize in the sun, in short, healthy soil is also conducive to cultivating disease-free seedlings.

3. Grafting prevention.

The watermelon wilt pathogen has host specialization, and the pathogens that infect watermelon will not infect other melons, so grafting seedlings is the main method for the prevention and control of Fusarium wilt. A large number of studies have shown that watermelon seedlings grafted with gourd, gourd, pumpkin, winter melon and wild watermelon as rootstocks are particularly resistant to Fusarium wilt and can effectively prevent the occurrence of this disease. In production, in order to prevent wilt in some watermelon continuous cropping areas and greenhouses, grafted seedlings are basically selected.

Fourth, crop rotation prevention.

Reasonable crop rotation can reduce the incidence of wilt. Where conditions permit, watermelon can be rotated with gramineous crops and leguminous crops.

5. Pharmaceutical prevention and control.

For watermelon wilt, pesticide control is still widely used due to the ease of use. You can choose to use dioxazin, fludioxonil, polyantimycin, methamethaline, benzoxystrobin, dichlorin, dixone and other agents to irrigate the roots. At the same time, attention should be paid to increasing the use of biological fungi in fertilization and usual prevention work, such as the use of Fusarium wilt antagonists or compound fungal agents such as EM to inhibit harmful bacteria in the soil.

Watermelon is Pythium cataplexy. The active ingredient in the enemy is 30% multi-fu wettable powder. It can prevent and treat watermelon cataplexy. However, it is only for prevention or initial use. (The content of carbendazim and formamic is a very common pesticide).

What causes watermelon catalysis? What are the preventive and ** measures?

Hello dear, watermelon cataplexy is caused by the infection of Pythium melon and Delhi Pythium, and the world has reported that it is a disease that occurs on watermelon. Watermelon cataplexy is a common disease in the seedling stage of watermelon in solar greenhouses, especially in early spring greenhouse seedlings or direct seeding. At the beginning of the disease, yellow to yellow-brown water-stained lesions are born at the base of the stem or rhizome near the ground of the seedlings, causing the seedlings to fall suddenly and break off as soon as they are pulled.

The occurrence of watermelon cataplexy is closely related to temperature, humidity, light and management. Generally, seedlings are conducive to disease when they encounter low temperature, continuous cloudy days, and excessive humidity. Incomplete disinfection of bed soil, excessive sowing, insufficient light, poor ventilation, and excessive irrigation are all conducive to the occurrence of the disease.

The prevention and control methods of watermelon cataplexy are mainly agricultural control, biological control and chemical control. First of all, reasonable crop rotation; According to local conditions, disease-resistant varieties are selected; unify the seedling supply and strengthen the management of seedlings; Combined with biological control and chemical agents for control.

There are many reasons for watermelon seedlings, but they are mainly affected by the weather, and when the weather is cold and cloudy, watermelon seedlings are more common, especially after a long period of rain, the probability of seedlings rotting is extremely high. The advantage of watermelon seedling transplanting is to sow seeds in advance under certain facility conditions, artificially create environmental conditions suitable for the growth and development of seedlings, cultivate strong seedlings that meet production requirements, and then transplant them to the field or transplant them to protection facilities when the external climate conditions are suitable.

First of all, the root system of melons has relatively single requirements for soil elements, so it is recommended to use the roots of gourds or pumpkins to graft melon seedlings, so that there is no problem of heavy stubble, and can be planted in a piece of land for many years, and then share with you the precautions for raising seedlings, first of all, pumpkin babies should be in the seedbed'Bud buds'This helps the seedling rate to be high watermelon rotten seedlings, generally the watermelon seedbed has a large amount of water, the temperature is humid and the temperature is low, resulting in melon seedling rotten roots, flash seedlings, that is, blight, and mildew rust, at this time you can use 10 grams of multibacterial phosphorus, 5 grams of powder rust Ning with 30 kg of water, spray, Fang Si to solve the problem.

Rotten seedlings should be prevented when the seedlings are raised, and it will be much better to get a small shed and cover it with film when raising seedlings. If necessary, take some medicine for the worms. Pay attention to the humidity management in the shed.

On the basis of increasing the temperature of the shed, we should properly ventilate and reduce the humidity. In case of cloudy days, which are not suitable for ventilation, or the ventilation conditions are poor, quicklime can be prevented in the shed to reduce the humidity.

After the watermelon seeds germinate, rotten seeds, rotten buds, or the base of the stem of the melon seedlings shrinks into a line, and then the watermelon seedlings fall suddenly and die. If the environment is high humidity, white flocculent matter will appear in the affected part. 1. The selection of disease-resistant varieties is the primary condition for planting melons, and the improvement of varieties and strong seedlings is the basis for high yield; 2. Soaking and dressing seeds is a technical measure to reduce diseases, and it is also the key to improving the strength of seedlings; 3. The application of organic fertilizer, biological fertilizer and medium and trace element fertilizer is the foundation for improving quality, increasing yield and resisting disease.

The solution is to observe the seedlings of watermelon first, and fertilize the corresponding watermelon, you can pull out all the seedlings that do not grow well, if there are pests of seedlings, you need to deworm, and the watermelon that grows slowly should be fertilized, and it is also necessary to ensure that the growth process of watermelon will not be disturbed by other external factors, these are measures to solve the problem of watermelon seedlings.

These abnormal seedlings can be transplanted directly, find the abnormal cause of the vaccine and solve it appropriately, or find a way to improve the surrounding environment to avoid a very serious situation, in short, we must find a way to solve this problem.

It is likely to be caused by lack of water or malnutrition, at this time, it is necessary to water and fertilize in time, but also to prevent the occurrence of some pests and diseases, and also to do a good job of drainage. It is also necessary to clean up some dead branches and leaves in the field and supplement the light.

The first thing is to increase the ground temperature of the seedbed, and to ensure the humidity, and the spacing must be about three centimeters when planting, and the soil should not be too thin, and the bottom water must be sufficient.

First of all, we must find the key point of abnormality, you can buy some pesticides for watermelon seedlings, which can be sprayed on watermelon seedlings, and also turn over the soil frequently, maintain the permeability and water absorption of the soil, water in the morning and evening, and appropriately increase some compound fertilizer, which can solve the abnormality of watermelon seedlings.