Ask for help What s going on with tomato yellow leaves, and how to prevent it?

Key points of tomato yellow leaf control.

The middle and lower leaves of the tomato plant are dominant, and the leaves have yellow spots at first, and gradually develop into yellow throughout the leaves, but mainly the leaf veins are yellow, and the leaf veins are still green. With the development of the disease, the leaves gradually become brittle and hard, fragile, and in severe cases, they are aging and falling off, which affects the normal growth of the whole plant, resulting in the symptoms of premature aging of the plant and fruit. First, the incidence of the disease is as follows:

a. It occurs in the middle and lower leaves, and gradually develops from the bottom to the top, among which the disease is more serious in the front face of the greenhouse and the plants with weak growth. b. Tomatoes with large red fruit and pink fruit all occurred, but the occurrence of pink fruit tomatoes was the most important, especially when the fruit of the third shed to the fourth shed began to swell.

2. Symptom Analysis:

First of all, this is a symptom of magnesium deficiency, which is a physiological disease. (1) Soil deficiency year after year, not timely replenishment, resulting in soil magnesium deficiency (2), improper replenishment of fertilizer form, affecting its utilization rate and a large amount of potassium fertilizer at the same time, affecting the absorption of magnesium Excessive use of hormones, early aging of plant roots, poor nutrient absorption. The application of non-rotting organic fertilizer causes root burning, which affects the absorption of nutrients by the root system (3), and the root system stops absorbing nutrients at low temperature (4), and the lack of light affects photosynthesis, reduces nutrient production, and the supply is insufficient.

3. Solution: 1. Soil replenishment of magnesium sulfate, potassium magnesium sulfate, etc. 2. Foliar spraying of calcium magnesium nitrate and magnesium nitrate 3. Increase ground temperature and promote root absorption. 4. Increase light 5. Fertilizer Choose base fertilizer and use organic fertilizer (cimaron organic fertilizer) to cultivate robust plants and huge root systems; Top dressing selects a fully water-soluble fertilizer (kart water-soluble fertilizer) containing a variety of nutrients, which is conducive to the nutritional form absorbed by crops; Avoid partial application of hormonal fertilizers; Avoid supplementation with elements that affect magnesium absorption; Avoid using uncooked organic fertilizers.

It may be poor ventilation, drought, waterlogging, fertilizer damage, leaf spot disease, and leaf mite damage. Let's take a closer look and get the right medicine.

Look at what season, this season will definitely be yellow leaves. If it is a yellow leaf in the peak production period, it is an iron deficiency, use some ferrous sulfate. Diluted, sprayed.

I'm using kart now, and it works well, ** it's okay, I recommend you try it.

Cause. First, man-made damage to the root system must pay attention to the combination of depth and shallowness when cultivating and hoeing. The place far away from the plant can be appropriately deeper, and the place near the plant should be appropriately shallow, so as to avoid artificially causing root damage. Cause.

Second, the application of unrotted raw chicken manure and the use of organic fertilizers such as chicken manure must be fully decomposed before it can be used! If the chicken manure is fully decomposed, it will not cause the occurrence of root burning and seedling, and it will avoid the tomato leaf rolling and yellow leaves that occur for this reason. Cause.

3. The yellow leaves caused by drought should be watered in a timely manner during the tomato growth period, to ensure that the soil moisture is wet and dry, and not to control the water excessively to control the plant growth. To prevent plant growth, you can spray methostatin or mequat to control, and it also has the effect of promoting reproductive growth, avoiding excessive water control and causing tomato leaf curling and yellow leaves. Cause.

Fourth, the continuous cropping of tomato caused by the lack of nutrients is easy to cause the lack of trace elements in the soil due to partial consumption, and if you do not pay attention to supplementation, it is easy to cause tomato yellow leaves, such as zinc deficiency and iron deficiency are easy to cause tomato yellow leaves. After the tomato is transplanted, the fixed roots are not done well, the new roots are less drawn, and the seedlings are slow, so it is easy to appear that the seedlings are yellow and weak, and when encountering unstable climate, it is easy to die and rot the roots. Therefore, rooting promotion after transplanting is the foundation, watering Yeshuo tomato seaweed long-term water-soluble fertilizer + Yeshuo tomato special foliar fertilizer, can effectively supplement the medium and trace elements required for tomato growth, promote the growth of hairy roots, strong growth, and strengthen seedlings.

Causes of yellowing of tomato leaves:

The yellowing of the leaves of tomatoes may be due to too much watering, insect infestation, or improper fertilization.

Solution: 1. Pruning: Remove the yellowed leaves.

2. Watering: Stop watering and wait for the soil to dry; Water thoroughly once each time to ensure that there is enough moisture in the soil.

3. Pest control: When insect pests occur, you need to buy special insecticides and spray them on the plants.

4. Fertilization: Excessive fertilization requires timely watering to dilute the nutrients in the soil.

The remedies for yellowing tomato leaves are as follows:

First, supplement fertilizer.

The yellow leaves need to be cut off, and then the tomato is applied with a compound fertilizer containing nitrogen, phosphorus, and potassium.

Second, watering in time, the lack of water in the tomato may also cause the leaves to turn yellow, in this case, the soil should be loosened first, and then a large amount of water should be used to irrigate the tomato.

Third, enhance ventilation, if the environment is not ventilated, the leaves in the middle and lower parts of the tomato will turn yellow, and the maintenance of environmental ventilation should be strengthened.

If the leaves of tomatoes turn yellow, it is most likely caused by a lack of nail elements, and you can give him some potassium fertilizer or compound fertilizer to effectively alleviate it.

Causes: Continuous cropping of tomato caused by deficiency of nutrients is easy to cause the lack of trace elements in the soil due to partial consumption, and if you do not pay attention to supplementation, it is easy to cause tomato yellow leaves, such as zinc deficiency and iron deficiency are easy to cause tomato yellow leaves.

After the tomato is planted, water the roots, and spray rooting agent + mildew nathalin + amino acid foliar fertilizer + potassium dihydrogen phosphate at an interval of 5-7 days. It can prevent the occurrence of soil-borne diseases, slow down the seedlings quickly, and grow well.

Tomato growth is normal, to prevent and control tomato early blight, choose difenoconazole, flusilazole, azoxystrobin, iprodione, bromonitrile, pyraclostrobin spray control, and spray again every 5-7 days.

To prevent and control tomato late blight, use methyl manganese zinc, frost urea manganese zinc, enoyl manganese zinc + silicone spray control, and spray again every 5-7 days.

To control tomato leaf spot diseases, benzene is used. Azoxystrobin, prochlorazaz manganese salt, difenoconazole, benzo. Etherstrobin, flusilazole + foliar fertilizer spray control, spray again every 5-7 days, spray 2-3 times.

Tomato bacterial diseases can be controlled with copper hydroxide, octylamine, mesomycin, leaf dryazole, and agricultural streptomycin, and then controlled at an interval of 5-7 days.

It is also necessary to control aphids, whiteflies, thrips, and mites.

1. What is the problem with the yellowing of tomato leaves?

1. When planting tomatoes, if it is dry weather, it may cause the yellow leaves of tomatoes, especially the lower leaves of tomatoes, to be dehydrated for a long time, resulting in green aging of the leaves.

2. Watering in a high temperature environment, if the watering amount is too large, it may also cause tomato yellow leaves. Excessive watering will affect the growth of the root system, resulting in insufficient nutrient absorption and supply, and some leaves will show yellowing.

3. Yellow leaves caused by diseases, when tomatoes encounter diseases, the growth is weak, and some leaves will appear yellow leaves.

4. Lack of relevant nutrients and elements, resulting in yellowing of leaves, if the nitrogen is insufficient during planting, the leaves will show yellowing, the lower leaves will be yellow first, and gradually the whole plant will lose its green, and the lower part will be more yellow; Or during the critical period of vegetative growth, there is not enough nutrients in the soil, resulting in yellowing of the leaves.

5. Unreasonable fertilizer use leads to yellowing of leaves. When planting tomatoes, too much fertilizer is sprinkled, and the fertilizer is transpired to produce gas and burn leaves at high temperatures, causing yellow leaves!

6. Yellow leaves caused by pesticide damage, when spraying, unreasonable mixing, or excessive pesticide type and concentration, will also cause leaf burning.

7. The planting density of tomatoes in the field is large, and the lower leaves show yellowing. This condition is mostly caused by insufficient light and poor air tightness.

2. How to prevent and control yellowing of tomato leaves?

1. According to the moisture of the soil, small water should be watered many times, if it is planted in a greenhouse, it is necessary to take drip irrigation to control the humidity in the field, but to avoid hurting the roots.

2. When planting tomatoes, the planting density should be controlled, and reasonable pruning should be carried out according to the growth situation in the later stage, and the diseased leaves and old leaves should be removed in time.

3. Do a good job of nutritional supplementation in time, apply sufficient organic fertilizer when planting, and appropriately increase the use of phosphorus and potassium fertilizer, which can improve the stress resistance of tomatoes.

4. Do a good job of pharmaceutical protection, spray protective agents every half a month, and recommend the use of zebze, thiophanate-methyl, and benz. Pyraclostrobin.

Tomato is a plant that many people must be familiar with. Many farmers also grow large patches of tomatoes, which can be better sold and used for their own consumption. However, in the process of planting tomatoes, there will also be yellow leaves, and if such a phenomenon occurs, it also indicates that the tomato is in a bad state.

This is also a good solution that needs to be made by farmers. At this time, farmers also need to replace their own fertilizers. After all, a suitable fertilizer can make tomatoes grow better, and they can also grow more moisture.

Tomatoes need good nutrition**I hope everyone can pay extra attention, sometimes tomatoes have yellow leaves, then it also means that their growth has been in a bad state. This is also something that should be paid attention to by everyone, and the tomatoes should be fertilized and watered in a timely manner. In this way, the tomato can have a better growth state, otherwise there will be a bad behavior.

After all, tomatoes also need to have a good nutrition**, so that they can grow more lush. <>

The appearance of yellow leaves in tomatoes is also very serious, and many farmers also say that the situation of yellow leaves in tomatoes when planting is very serious. This is also a hope that everyone can carry out a good solution, if the situation of tomato is like this, then people should also pay special attention. At this time, it is also necessary to make good changes to the tomato, and sometimes the soil in which the tomato is grown is also very important.

If you can choose a moist soil and then fertilize the tomatoes well, this can also make the tomatoes have a better growth state. <>

Tomato cultivation needs to be carefully cared for, after all, tomatoes are a plant that needs to be carefully cared for, so that they can grow better, otherwise it will cause some unnecessary trouble. People don't want this to happen, and they say that tomatoes need to be planted with extra care and care. In this way, the planted tomatoes can be made better, and it can also bring people a special feeling.

Otherwise, it will be deeply complained by many people, and people will not be able to accept some phenomena and practices.

You can cut off the yellow leaves to promote the growth of new leaves, usually pay attention to spraying some sprays to remove pests, and water and fertilize regularly.

I think you should choose some organic fertilizer, be sure to ventilate when fertilizing, and don't fertilize too much, and water frequently.

Yellow leaves appear due to high temperatures, improper fertilization, pesticide damage and viral diseases. In the cultivation of tomatoes, it is necessary to shade, ventilate and cool down, control the temperature in the field, and the key to prevention and control is prevention, first of all, we must use disease-resistant tomato varieties.

Fertilization should be carried out. If this happens, it may be that it does not get enough nutrients.

There are many reasons why the leaves of small tomatoes turn yellow, which can be related to fertilizers, pests and diseases, and moisture. Only by doing a good job of maintenance can you grow well. Let's go with the gardener uncle to understand the causes and solutions of small tomato yellow leaves.

1.Insufficient nutrients during the growing season, and the yellowing of the leaves of the small tomatoes may be caused by insufficient fertilizer. The need for fertilizer is very high, and sufficient fertilizer is conducive to the growth of leaves and flowers.

Solution: If the leaves turn yellow due to insufficient fertilizer, cut off the yellow leaves, and then apply a compound fertilizer containing nitrogen, phosphorus and potassium to the tomatoes, which can promote the growth of the tomatoes. 2. During the maintenance of pests and diseases, if the maintenance is not done properly, the leaves of the tomato will turn yellow after being attacked by pests and diseases.

Don't stop using chemicals in between. After a while, you can get rid of pests and diseases. 3. Lack of water during the growth period, if the tomato is in a state of water shortage for a long time, the leaves will dry up and turn yellow.

Solution: If it is caused by insufficient moisture, it is necessary to water the tomatoes in time to replenish the water. In the later stage of maintenance, in order to avoid poor growth of small tomatoes due to lack of water, it is necessary to adjust the watering method and water the small tomatoes reasonably to avoid excessive water damage to the roots.

Tips] During the growing season, baby tomatoes need proper watering and fertilization, as well as plenty of light. Before flowering and fruiting, it is necessary to increase the amount of water and fertilizer to provide sufficient nutrients. During the maintenance period, it should be sprayed regularly, generally once every 20 to 30 days, which can effectively control pests and diseases.

What causes yellowing of tomato leaves? Solution.

1. Root system damage.

Yellow leaf cause: If the middle and lower leaves of the tomato plant are yellow, you can consider whether the tomato has root damage, such as overwatering, causing soil waterlogging, and the plant is stuffy roots, such as root disease, and the phenomenon of yellow leaves will also be shown.

Solution: For the soil water accumulation caused by overwatering, it is necessary to cut off the water in the short term, and wait until the soil is close to drying before watering. For plants with root diseases, the damaged plants should be removed in time to prevent them from being transmitted to other plants.

Apply Root Lotter to promote root regeneration.

2. Poor ventilation.

Yellow leaf cause: If the middle and lower leaves of the tomato plant are yellow, you can also consider whether the maintenance environment is ventilated, if the plant branches and leaves are luxuriant, the maintenance environment is poorly ventilated, and the tomato leaves will turn yellow.

Solution: For the yellow leaves of the plants caused by poor ventilation, it is necessary to strengthen the ventilation of the maintenance environment as much as possible, and remove some leaves from the densely planted plants, which can effectively reduce the occurrence of tomato yellow leaves.

3. Wound infection.

Yellow leaf cause: If the tomato has yellow leaves after pruning, cut the stalk of the plant, and find that the internal xylem has turned brown, it is most likely caused by infection at the wound of the plant after the forking.

Solution: Break the tomato to choose a sunny day, before and after watering, do not interrupt in rainy weather, for the yellow leaves that have been forked, to cut off all the stems and leaves in question.