What causes melon seedling? Do farmers have a solution?

The reasons for the death of melon seedlings are: 1. Too much water, and the seedlings are rooted. Roots mostly occur in long-term low temperature, high humidity, and low light weather, resulting in drooping of seedling cotyledons, turning from green to yellow, and root rotting resulting in wilting and death of aboveground parts.

2. The root system of seedlings is relatively sensitive, and unrotted organic fertilizers, especially chicken manure, will cause crops to burn their roots; Damage to crop roots due to the application of adulterated fertilizers; Excessive application of fertilizers leads to excessive soil fertility, which can harm crop roots. 3. The temperature suitable for the root system of melon is mainly 15 20, and the temperature is too low to cause the root system of melon seedlings to be relatively weak and easy to die.

Solution: Sterilize the seeds before sowing. Soak the seeds, soak the seeds with 70% methyl tobuzine 500 times solution or 50% carbendazim wettable powder 1000 times solution for 40 minutes, rinse with water after removal, promote germination, and sow seeds.

Seed dressing, dry seed sowing, soak the seeds with water and then take them out, mix the seeds with 70% methyl tobuzin or 50% carbendazim powder by weight of the seeds, and then sow the seeds.

1. Physiological wilting, no bacterial pus in the middle of the stalks. This is usually caused by a problem with the root system. For example, when watering, too much water is used, the soil moisture is high, the root growth is poor, and the growth of the plant is affected and wilts.

In order to avoid such problems, when watering, try to water as little as possible, and also pay attention to the watering time at low temperatures. When watering, you can add some root protection, such as potassium fulvic acid, chitin, etc., to protect the root system from damage, so that the plant can grow normally. 2. Diseases occur, causing plants to wilt, both fungal and bacterial diseases.

For example, melons wilt and wilt at the swelling stage, and the plant turns from green to yellow in about 7 to 10 days, and the whole plant dies. It takes about 3 to 4 days for bacterial wilt and dies in the case of green leaves. For this disease, it is necessary to dip the roots when transplanting.

In addition, after sitting on the melon, you can irrigate the roots in advance to prevent it. Commonly used dichlorfen, allicin, fludioxonil, copper preparations, etc. to irrigate the roots, each plant needs about 60 ml. In order to improve the effect, you can change the recipe and then irrigate the roots after an interval of one week.

Climatic reasons. After the grafted melon seedlings are planted in the greenhouse, when there are more cloudy days, foggy days, rain and snow days, the growth of melon seedlings is weak due to weak light and low temperature, and the number of roots is small.

As far as I know, it is caused by Fusarium oxysporum in melons, which belongs to the subfamily Semifungi, and the typical symptom of the disease is wilting, which can occur throughout the growth period of melons, but is most severe in the flowering and fruiting phases. In the early stage of the disease, 300 500 times of 5% salicylamide wettable powder can be used.

600-800 times 3% oxamine EC; mancozeb wettable powder 700 times liquid; 2000 times of 70% oxafen wettable powder; Irrigate with water, 250 ml of liquid medicine per plant, once every 7 days depending on the condition, a total of 2-3 times.

Stem rot caused by soil-borne diseases, continuous cropping or application of incomplete livestock and poultry manure, and soil moisture can occur most often, and according to reliable knowledge, there should be many pathogenic strains, and there is no good control method. Try applying a fungicide to see if it relieves it. After a period of rainfall and cooling, when the shed temperature drops, the evaporation of leaves weakens, the water absorption capacity of the roots decreases accordingly, and the ground temperature will further decrease.

At this point, the root system absorbs water = the leaves evaporate. When the weather suddenly clears, the temperature of the greenhouse rises rapidly and the evaporation of the leaves also increases rapidly, at this time, the evaporation of the leaves is much greater than the water absorption of the roots.

When the seedlings have their first true leaves, the daytime temperature is kept between 25 and 35, but the nighttime temperature cannot be lower than 15. When the melon seedlings are unearthed, the temperature requirements are high. Only by keeping the bed temperature between 25-30 degrees can the seeds emerge smoothly.

Before the emergence of seedlings to cotyledons, it is necessary to prevent high temples and cataplexy caused by high temperature and humidity, and take cold protection measures at night.

The root system of seedlings is sensitive, and the immature organic fertilizer, especially chicken manure, will cause crops to burn their roots; The application of adulterated fertilizer caused crop root damage and deficiency of celery; Excessive fertilization leads to high soil fertility, which endangers crop roots. The suitable temperature of the melon root system is mainly 15 20, and too low a temperature will also cause the root system of melon seedlings to be fragile and easy to die.

It may be infected by a germ, it may be root rot, it may be bacterial wilt. It may be that the seedlings are malnourished.

Symptoms of melon seedling wilting Melon seedling wilting is a physiological disease that often occurs in the late stage of melon growth, often leading to a decrease in melon yield. Melon plants show weakness when the seedlings collapse. The weather is clear, the sun is abundant, and when the temperature is high, there will be a sudden rainstorm, and then the sudden cold temperature difference at night is extremely unbearable, so it is easy to collapse, but when it is light, it can recover slowly, and most of the serious ones die.

A large number of harmful substances will be produced, resulting in root poisoning, root system can not grow normally, lose leaf transpiration and root water supply ability, make stems and leaves weaker, and appear seedlings collapse. Second, in the high temperature season, the daytime temperature is high, the transpiration is vigorous, or the weather is cloudy and sunny for a long time, and the transpiration loss is greater than the root water supply, which will lead to the withering and lodging of melon seedlings. This phenomenon is more sudden, and the root regeneration ability is weaker in the late growth stage.

Once recovery is slow or inadequate, the damage will only increase.

If the production area is large or the water source is insufficient, ditching or fan watering can be used. After watering, it can be cultivated in time to keep the soil temperature normal, and it can also play a role in prevention and control. Drainage should be done in time on rainy days to ensure that there is no stagnant water in the field, and the soil should be cultivated after rain to loosen the soil and ensure the normal respiration of the root system.

In addition, wash your hands with soapy water and a knife before field work to prevent juice rubbing and infection. Spraying should be started in the early stage of pests and diseases, spraying once every 10 days or so, and continuous control 2 or 3 times depending on the condition. Seedling collapse is a physiological disease in the growth stage of melon, which mainly occurs in the later stage, which not only affects the fruit quality, but also reduces the yield.

At the same time, the emergence of this phenomenon may make the plant show special weakness, once the seedling collapse is particularly severe, it will cause a decrease in fruit yield and bring economic losses to the fruit farmer.

Piezobacteria have limited activity and produce many harmful components, which can poison melon roots. Once the roots do not grow properly, the evaporation of the leaves and the ability of the roots to obtain water will be greatly reduced, or even completely lost. At this time, the stems and leaves will be poisoned.

The temperature is too high. This situation will not only cause the evaporation capacity of the leaves to reach the vigorous stage, but also cause the root system to not get enough water after the evaporation of too much water, which will eventually lead to the collapse and wilting of the seedlings. This situation is quite harmful, and growers must be aware of it.

Finally, let's talk about what should be done to prevent the collapse of this fruit. For example, once the weather is particularly sunny after rain, it is necessary to water immediately to reduce the surface temperature and make the surface temperature suitable for the growth of the field. Of course, it is necessary to drain the water in time after watering, otherwise the root system may accumulate a lot of water and cause root rot.

First, due to the high osmotic pressure of the soil rock swimming solution, the crude lead is high, and the anoxic root system is suffocated. The root system is poisoned by the activity of aerophobic bacteria and the production of harmful substances. The root system cannot grow normally, and loses the ability of foliar transpiration and root water supply.

Second, the ground temperature is high during the day in the high temperature season, the transpiration of melon is vigorous, or it is cloudy for a long time, the water loss of transpiration is greater than the water supply of the root system, and the melon seedlings wilt and lodging. It is especially prominent in the later stages of growth. The regeneration ability of roots in the late growth stage is very poor, and the recovery is slow or impossible to recover after poisoning or damage, and the damage is even greater at this time.

Melon seedling collapse is a physiological disease, which often occurs in the late growth stage of melon, often leading to a decrease in melon yield. When the seedlings collapse, the melon plants show weakness, when the weather is sunny, the sun is sufficient, and the temperature is high, the sudden rainstorm falls, and then the temperature difference is extremely unbearable at night, and it is easy to collapse the seedlings.

There are two main types of melon seedlings: one is that the low-lying melon field is waterlogged after rain or the water content in the soil is too high, resulting in root suffocation or in the condition of disgust, and harmful substances are produced in the soil, causing root poisoning or causing root rot. The second is in the hot summer, the ground temperature is high during the day, and the surface often reaches 40, at this time, the transpiration of melon leaves is vigorous, and the water absorbed by the root system is transpired out from the leaves through the conduction tissue, and the body temperature is regulated, but in the cold night when the ground temperature suddenly decreases in the face of heavy rain, the soil temperature of the cultivated layer is low, and the transpiration is inhibited, resulting in the lodging of the melon seedlings.

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There are reasons why melons are collapsing, and what do you know?

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Hello, glad to answer for you. The reasons for the collapse of melon seedlings are as follows: the first reason is that the soil is waterlogged or the humidity is too low, which will hinder the respiration of the root system, and the root system will be hypoxic, because of the activity of anaerobic bacteria, a large number of harmful substances will be produced to make the root system poisoned, the root system can not grow normally, and the ability of foliar transpiration and root water supply is lost, so that the stems and leaves will be weakened, so that the seedlings will be hungry and collapsed.

Second, the daytime temperature in the high temperature season is high, the transpiration is vigorous, or the weather is cloudy for a long time, and the water loss from tranpiration is greater than the water supply of the root system, which will lead to the lodging of the seedlings. This phenomenon is more prominent in the late growth stage, when the regenerative power of the root system is weak, and the damage will only be greater if the recovery is slow or unable to recover.

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1.Physiological wilting: when the light is strong and the temperature is high, the leaves of the melon seedlings wilt, and return to normal in the evening and morning, the root system grows well, there are no rot symptoms and root-knot nematode root nodule symptoms, the stem grows well without cracked vine gelatin, the stem and vine cross-section is sterile, and there is no browning lesion in the xylem.

2.Pathological wilting: In the early stage of the onset of Fusarium wilt, the main manifestation is that the leaves of the whole melon plant wilt during the day, and return to normal at night, and the plant will no longer recover at night as the disease develops, resulting in plant death.

When the plant is pulled up, the root epidermis is rotten, the xylem is browned, and the root hairs die. The initial characteristics of vine blight are not obvious, the baloem at the base of the stem is cracked or rectangular gray-white lesions are formed, and when the melon is watered, due to the increase of humidity, the epidermis of the stem base is cracked, and the xylem is browned. If it is mixed with bacterial infection, it will rot and have an unpleasant odor.

The first is that you may add a lot of fertilizer to it in order to mass production, resulting in its nutrient absorption will burn the roots, it will easily lead to wilting, you must go to its fertilizer in planting and then water it, so that it can be absorbed very evenly.

It may be because of physiology, it will return to normal without worry, or it may be because of pathology. It may be because the soil is moistened by watering too much.

Melon blight, easy to cause dead seedlings.

Agricultural control: choose well-drained and high-dry plots for planting.

Lime was applied to adjust the pH of the soil, so that the pH of the planting field was slightly alkaline, and the amount of quicklime was 50 100 kg per mu.

Do a good job of thermal insulation at the seedling stage to prevent low temperature and cold wind invasion, watering should be determined according to soil moisture and temperature, strictly prevent excessive humidity, and the watering time should be changed in the morning.

Seed treatment: Seed treatment is carried out before sowing, and 45% of the seed weight of the seed can be adhered to the seed surface, and then a small amount of fine soil is mixed before sowing. It is also possible to wet the seeds with 75% Weifu wettable powder or 40% double wettable powder for seed dressing, or 50% Likella wettable powder or 70% soil fungus wettable powder after the seeds are wetted.

Chemical control: conditional application of antibiotic fertilizer, application of compost made of enzyme bacteria or decomposed organic fertilizer.

180 360 grams of 95% sodium disulfonate wettable liquid, 150 220 grams of 20% methyl phosphorus emulsifiable concentrate (one clear), 5000 grams of 40% pentachloronitrobenzene (soil bacteria), 1000 1500 grams of 20% copper acetate (soil mycium). In the early stage of the disease, 30% phenylthiocyanide (multibiotic) emulsifiable concentrate, 50ml per mu, 5okg of water, diluted into 1000 times liquid spray, can effectively prevent and control cataplexy and blight, and also treat anthracnose and wilt at the seedling stage. In addition, it can also be sprayed with 72% manganese-zinc * frost urea (Kelu) wettable powder 600 times liquid, vanzitong * mancozeb (Yibao) water dispersible granules 1500 times liquid, 60% fluoromorph* manganese zinc (fenke) wettable powder 700 times liquid, 30% oxamine (soil fungus elimination) water solution 800 times liquid, each Jinggangmycin water solution 1000 times liquid, or 45% Tekeduo suspension 1000 times liquid, or 50% promethexin wettable powder 1000 times liquid, Pulik water solution 800 times liquid.

The application of transplanting mixture has strong bactericidal power, and at the same time, it can promote the resistance of the root system to unfavorable climatic conditions, and can prevent the occurrence and spread of blight.

In areas or fields with severe fruit rot disease, the melons should be padded and sprayed with 30% emulsifiable concentrate 1000 times or Yunda 120 (brassinolide) plant growth regulator 3000 times if necessary.