What to do if tomato yellow leaves wilt? What is the reason why the tomato leaves turn yellow and st

Yellow leaves and dead trees of tomatoes in greenhouses are common, causing a lot of losses to the majority of growers. The causes of tomato yellow leaves and dead trees are very complex, only by tracing back to the source can we prescribe the right medicine, here we will specifically analyze the root cause of tomato yellow leaves and dead trees.

One of the sources of the disease: soil salinization leads to yellow leaves.

With the extension of greenhouse planting years, the excessive use of chemical fertilizers, because phosphorus, potassium and calcium can be fixed by the soil, combined into some salts that cannot be absorbed and utilized by crops, and accumulate year after year, which will lead to soil salinization. Some survey reports show that the incidence of soil salinization is about 30% when planted in greenhouses for more than 3 years, so the phenomenon of yellow leaves of tomatoes in old sheds is very common.

Solution: First turn the ground 35 cm deep, and then fill it with water once to fully leach the soil salt into the groundwater. The second is to increase the application of fully decomposed farm fertilizer, especially crop straw or cow and horse manure, through the adsorption of organic matter to the salt, to reduce its damage to the root system.

Then apply Jiamei dividend and Hailibao to adsorb the free salt separators in the soil to decompose the salt substances.

The second source of the disease: nutrient deficiency leads to yellow leaves.

The lack of nitrogen fertilizer, potassium fertilizer and magnesium fertilizer can make the middle and lower leaves of the crop yellow, and the lack of iron fertilizer and zinc fertilizer can make the top leaves yellow. Production practice is often due to a large number of chemical fertilizers, nitrogen, potassium, magnesium fertilizer is not lacking, but over-application, the root cause of the yellow leaf phenomenon or lies in the soil or roots, such as the deterioration of soil conditions limit the growth of the root system, or the poor growth of the root system limits the absorption, or the antagonism between the elements, these can cause mineral nutrients can not be used and lack of use, no matter how much is used, it will not help.

Solution: Firstly, the above method was used to improve the salinized soil; The second is to reduce the amount of pure chemical fertilizer, increase the application of farm fertilizer, organic fertilizer, biological fertilizer, organic activated nutrition series Jiamei dividend, Hailibao, and profit; then pay attention to the prevention and control of root diseases and cultivate a strong root system; In addition, it is necessary to carry out topdressing outside the roots from the young fruit stage, focusing on supplementing 800 times the liquid Jiamei brain platinum, and you can also use the 800 times liquid of Jiamei dividend to irrigate the roots, so as to achieve the purpose of activating the soil and rooting and strengthening the trees.

Source 3: Root disease leads to yellow leaves and dead trees.

Tomato root diseases are mainly root rot, stem base rot, wilt, etc., when the root disease is slight, it will inevitably cause root injury, nutrient absorption is blocked, and yellow leaves are inevitable. When the root disease is severe, the phenomenon of dead trees will occur. The second is root disease caused by excessive watering or poor soil compaction and air permeability.

In addition, the indiscriminate use of pesticide spray or fumigation can also lead to yellowing of leaves.

If the temperature is too high, the formation of high temperature heat damage will cause yellow leaves. If this is the case, you can increase the air volume, control the temperature, and then spray foliar fertilizer to supplement the nutrients of the tomatoes.

It is necessary to strengthen fertilizer and water management, apply more well-rotted organic fertilizer, and balance fertilization; Open drainage ditches to avoid water accumulation in the field, reduce the humidity in the field, promote the growth of crops, and improve the disease resistance of crops.

Seed selection, choose seeds with strong resistance to viruses. A good start, half the battle.

Reasonable fertilization, proper loosening of the soil, tomatoes need a good growing environment, careful care.

If the pest occurs at the initial stage, the corresponding pesticide can be sprayed with water in proportion. Be sure to pay attention to the concentration, health first!

It is very likely that the plant is deficient in nutrients, so nitrogen and potassium fertilizers should be supplemented in time to promote the growth of plant rhizomes and regular watering.

The reasons why tomato leaves turn yellow and start wilting are as follows:

1. Lack of moisture.

During the growth of tomatoes, if they are not replenished in time, the branches and leaves will be in a state of dehydration, and they will dry out. When maintaining, if you find that the soil is dry, you should water it immediately, usually once every 2-3 days.

2. Pest and disease infestation.

When there are germs or insects on the plant, its leaves will be attacked, which will also cause the leaves to dry up. It is necessary to spray with pesticides as soon as possible, and if you do not control pests and diseases in time, tomatoes are likely to die.

3. Excessive moisture.

To maintain tomatoes, we must wait for the potting soil to dry and water thoroughly to avoid excessive watering, as excessive moisture in the soil will easily cause root rot and easily induce leaf spot.

4. Soil agglomeration.

If the soil where tomatoes are planted is clumped, even normal watering will cause the leaves of the tomato to turn yellow, and the soil will be clumped or not permeable enough to cause hypoxia in the roots, and the first symptom is that the leaves are yellow.

5. Fungal diseases.

Fungal diseases are a common problem in tomatoes, especially when seedlings are cultivated, if you find that there is a rot of rhizomes, you must pull it out to avoid infecting other seedlings. Sometimes the soil will also contain fungi, and a lot of water or an unventilated environment can easily lead to leaf spot disease, and the leaves will also turn yellow.

Tomato leaves are yellow and wilted, if it is caused by infection, it should be disinfected and sterilized before planting, the diseased branches and leaves should be pruned and destroyed, and then sprayed with fungicide**. If it is caused by insect infestation, it can be caught by hand and then sprayed with insecticide. If it is caused by lack of nutrients, you can fertilize tomatoes reasonably, and fertilize symptomatically to ensure nutrition.

If it is caused by overwatering, it should be watered in an appropriate amount, and ventilation should be maintained to promote the discharge of stagnant water.

Tomato yellow leaves withered raw

Yellowing of tomato leaves is usually due to under- or over-watering, as well as a lack of nutrients and pests and diseases. Most of the yellow leaf conditions are easy to deal with, and it is necessary to find out the problem according to your own maintenance method and diagnose the cause of the yellow leaf.

1.Overwatering and root rot.

2.Soil agglomeration.

3.Leaf spot.

4.Blight.

5.Lack of nutrients.

Hello, glad you askedWhat to do if tomato leaves are yellowed and wiltedWhat to do Tomato leaves are yellow and wilted can be caused by a variety of reasons, and here are some common ways to deal with them:1Check the watering:

Too much or too little watering can cause the leaves to turn yellow and wilt. Make sure the soil is moderately moist, but not too wet or too dry. When watering, be careful to avoid standing water.

2.Provide plenty of sun: Tomatoes love plenty of sunlight to ensure that the plant gets enough sunlight.

If the plant is in a shady location, consider moving it to a sunny area. 3.Supplement with proper nutrition:

Deficiencies in key nutrients can also cause the leaves to turn yellow and wilt. Suitable fertilizers can be used to supplement the nutrients required by the plants. Choose a fertilizer that is specifically for tomatoes and apply it according to the instructions on the package.

4.Check for pests and diseases: Yellowing and wilting of leaves can also be due to pests and diseases.

Check whether the plants are affected by pests and diseases, such as powdery mildew, leaf mold, aphids, etc. If pests and diseases are found, appropriate control measures can be taken, such as the use of appropriate pesticides or biological control methods. 5.

Check root health: Yellowing and wilting of leaves can also be caused by root problems, such as root rot or damaged root systems. Check that the roots are healthy, and if you find a problem, consider replacing the soil or taking appropriate measures to repair the roots.

If this does not solve the problem, it is advisable to consult a professional horticulturist or agricultural expert, who can provide more specific advice and assistance depending on the situation

Tomato leaf yellowing treatment methods include watering, pest control, fertilization, ventilation, and so on.

1. Watering. In the process of tomato growth, if you can't replenish water in time, the branches and leaves will be in a state of dehydration, in the maintenance, find that the soil is dry to water immediately, generally 2 3 days to water the socks once.

2. Pest control. When there are germs or insects on the tomato plant, it is necessary to spray the drug as soon as possible, and if the pests and diseases are not controlled in time, there will be very serious consequences.

3. Fertilization. During the growth period of tomatoes, fertilizer should be supplemented in time, fertilizer should be fully fermented before use, and thin fertilizer should be applied frequently.

4. Ventilation. When the temperature rises gradually, it is necessary to properly ventilate and do a good job of ventilation.

Precautions for planting tomatoes

1. Soil. Tomatoes can tolerate drought, but not waterlogging, and the soil requirements are not very strict, in order to obtain high yields, it is necessary to choose a deep soil layer, loose and fertile, and strong water and fertility retention.

2. Fertilization. After deep ploughing and raking, it is opened into a box with a width of 80 cm and a height of 16-24 cm, and the width of the box ditch is 33 cm, and each box is planted in 2 rows. When fertilizing, the reasonable ratio of nitrogen, phosphorus and potassium is 1:

1:2, 3000 5000 kg of decomposed organic fertilizer per mu, 25 kg of superphosphate and 20 kg of potassium fertilizer (or 80 kg of plant ash) are applied.

3. Sowing seedlings.

Put the seeds in hot water, stir to 30 °C and soak for 3 4 hours. After soaking, the seeds are placed at 25 to 28 °C for germination, and 60 to 70% of the seeds are germinated before sowing.

Hello, there can be many reasons for the yellowing and wilting of tomato leaves, including lack of water, potassium deficiency, pests and diseases, etc. To solve this problem, you can or destroy the following methods:1

Watering tomatoes: Lack of water can be the cause of yellowing and wilting of the leaves, so make sure your tomato plants have enough water**, but don't let the soil get too moist. 2.

Fertilization: Potassium deficiency is also one of the causes of yellowing of leaves. When the leaves of tomatoes appear yellowing, potassium-rich fertilizers can be added.

3.Pest control and disease control: Pests and diseases can also cause tomato leaves to turn yellow and wilt.

Pesticides or natural control methods such as soaking the leaves with soot water, spraying laundry detergent water, spraying with garlic liquid, etc., can be used to ensure that the tomato plants are not attacked by pests or germs. The above are some possible solutions, and you can choose the appropriate method according to your specific situation. At the same time, we should also pay attention to daily maintenance and management, and check the status of tomato plants in time to avoid problems.

The solution to the yellowing and wilting of tomato leaves is to control insect pests and supplement nutrition.

1. Pest control.

When tomatoes are diseased, many of them infect the leaves. For example, early blight with a high incidence of tomatoes planted in spring and summer will dry up the lower leaves, and it will also damage the fruit and stems. To prevent and control tomato blight, on the one hand, it is necessary to control the temperature and humidity, and on the other hand, it is necessary to use the right agent and spray in advance to prevent it.

For example, tomato gray mold begins to dry up from the tip and edge of the leaf, and severe oak annihilation occurs under low temperature and high humidity. As long as the temperature in the shed is increased and the humidity in the shed is reduced, the occurrence of gray mold can be controlled, and early prevention is very important.

2. Supplement nutrition.

When the tomato fertilization formula is unreasonable, there will also be yellow leaves and scorched leaves. At present, many farmers use a large amount of elemental fertilizer, which contains incomplete types, so there are many cases of lack of medium and trace elements, which is manifested in the yellowing of the upper leaves. When the tomato is deficient in potassium, there are yellow spots on the edge of the leaves, and in severe cases, the edges are dry.

Generally, the amount of potassium is more than twice as high as that of nitrogen to achieve balanced fertilization.

While we use nitrogen, phosphorus and potassium fertilizers, we should supplement medium and trace elements, plus 100 grams of medium and trace element fertilizers for every ten kilograms of fertilizer. Moreover, chelated fertilizers should be used, which do not react with other element fertilizers, and the absorption and utilization rate is relatively high. When yellow leaves appear, foliar fertilizer can be sprayed to quickly replenish the elements, but the root fertilizer should not be less.

Grow tomatoesPrecautions

1. Lighting conditions.

Tomatoes like full sunshine, and light intensity is directly related to tomato yield and quality, so good light conditions must always be maintained in cultivation. Tomato light saturation point is 70,000 lux, generally to ensure the light intensity of more than 3 - 10,000 lux, in terms of light time, there are 11-13 hours of light every day, the plant growth is the best, and the short-term sunshine can also grow and bear fruit normally.

2. Temperature conditions.

Tomato is a temperature-loving vegetable, generally speaking, 15 to 35 can be adapted to tomato growth in the pure temperature range. The optimal temperature for the seedling stage is 20 25 during the day and 10 15 at night. The flowering period is sensitive to temperature, and the optimal temperature is 20 30 during the day and 15 20 at night.

The suitable temperature in the fruiting period was 24 26 during the day and 12 17 at night. The optimal temperature for fruit coloring period is 20 25 or more, and the coloring is poor above 30.