How to treat tomato seedling wilt and how to prevent and control tomato wilt, I would like to ask ex

Treatment of wilt disease of tomato seedlings

1. The soil temperature is too low.

If the soil temperature is lower than 9-11 for a long time, the water absorption capacity of the tomato root system will be reduced, and the plant moisture will be out of balance, which will be manifested in the wilting of the stems and leaves of the plant, and find a way to stabilize the ground temperature above 10, and the tomatoes with wilted stems and leaves can be improved.

Second, the root system is damaged.

The stems and leaves of tomatoes wilt, followed by root damage, the root system of the plant has problems, its absorption capacity will decrease, the ability to absorb water becomes worse, for tomatoes with damaged roots, you can dig the plant out of the soil, cut off the rotten and shriveled roots, and re-pot the soil after a little rooting.

3. Air drying.

The wilting of the stems and leaves of tomatoes may also be caused by dry air, such as continuous rainy days after sudden sunshine, or when the wind is too rapid during the high temperature period, the air will become very dry, the leaves of tomatoes lose water too quickly, and the water absorption capacity of the root system can not meet the transpiration and water loss of the leaves, which will lead to wilting of the plants, and the air humidity of the maintenance environment can be improved.

Fourth, excessive fertilization.

The stems and leaves of tomatoes wilt, and finally it may be caused by excessive fertilization, such as a large amount of chemical fertilizer, resulting in the salinization of the soil for planting tomatoes, resulting in too low water potential around the roots of the plant, which affects the water absorption of the root system of the plant.

Symptoms: It mainly harms the rhizomes of tomatoes, and most of them begin to develop during the flowering and fruiting period. At the beginning of the disease, only the lower leaves of the plant turn yellow, and then the brown water chestnut wilts dry up, but do not fall off.

Sometimes the condition occurs only on one side of the stem, or when one leaf turns yellow while the other is normal. A dissection of the stem, petiole and fruit stalk reveals that the vascular bundles are brown. In a humid environment, pink mold is produced at the base of the stem of the diseased plant.

prevention and control technologies; 1.Remove weeds in and around the field, concentrate on burning or managing; Deep ploughing of the ground to eliminate stubble, promote the decomposition of diseased residues, and reduce the source of disease and insects.

2.Sterile substrate should be selected for the nutrition of seedlings*.

3.Crop rotation and non-crop rotation.

4.Choose disease-resistant varieties, choose disease-free, coated seeds, 5Seedlings are transplanted, covered with drugs after sowing, and insecticides are sprayed once before transplanting.

6.Choose fields with convenient drainage and irrigation, open drainage ditches, and lower the groundwater level to achieve no water accumulation when the rain stops; After heavy rain, it is an important measure to clean the ditch system in time to prevent moisture retention and reduce the humidity in the field.

7.In the fields with many soil pathogens or serious underground pests, it is necessary to carry out high-temperature stuffy sheds to disinfect the soil and space.

8.The application of well-rotted organic fertilizer or finished organic fertilizer, without bacterial fertilizer, the applied organic fertilizer shall not contain the disease residues of undergraduate crops.

9.Appropriate application of phosphorus and potassium fertilizers, strengthening field management, cultivating strong seedlings, and enhancing plant disease resistance are conducive to reducing diseases.

10.Timely control of pests, reduce plant wounds, and reduce the transmission route of germs.

12.For tomatoes cultivated in greenhouses, the greenhouses are closed in summer when the temperature is high and humidity, and the tuyere is blocked for two weeks, and the high temperature is stuffy to kill most of the pathogenic bacteria.

13.Pharmacological prevention.

How to control tomato wilt and bacterial wilt? Prevention and control of tomato wilt: reasonable fertilization, increase the application of phosphorus and potassium fertilizers, improve the disease resistance of plants, use disease-free soil seedlings or seedbed soil disinfection, and the method is the same as that of watermelon wilt control.

Seed disinfection, in addition to referring to the watermelon seedling disease control method, can also be used 50% gramsidan wettable powder dressing, the dosage is the weight of the seed. At the beginning of the disease, the roots and surrounding soil were irrigated with 50% carbendazim wettable powder 500 times, or 50% tobuzin 500 times, or 10% diacetalin 200 times, each plant was irrigated with kilograms, once every 7-10 times, and irrigated 3-4 times. Control of bacterial wilt:

Implement crop rotation with cruciferous vegetables and gramineous crops for more than 4 years. select bacterial wilt resistant varieties, such as Kangqing 19, Hongkang 12, 2, etc.; Adopt high furrow cultivation to avoid large water temperature irrigation; Apply fully decomposed organic fertilizer or plant ash, or apply 50-100 kg of lime per mu to make the soil slightly alkaline and reduce the incidence of disease, and at the same time, 7500 times of phytophorin can be sprayed; Pesticide prevention and control, timely removal and burning of diseased plants, perfusion of 2% formaldehyde solution and 20% lime water disinfection per hole, can also be sprinkled with lime powder. At the beginning of the disease, spray with 100-200ppm streptomycin sulfate or 500 times of 36% DT wettable powder, or 500-600 times of 70% DTM wettable powder, or 500 times of 25% copper ammonia aqueous solution, spray once every 7-10 days, spray 3-4 times continuously, and spray about 60 kg per mu.

You can also use the above-mentioned agent to irrigate the roots, each plant is filled with kilograms of medicinal solution, and combined with spray, irrigated once every 7-8 days, and irrigated 4-5 times in a row.

Control methods: biological control.

1.At the beginning of the disease, the roots were irrigated with 50% mycomethrin 1000 times or 800 times of dimethazol, 200 ml per plant, and the medicine was irrigated once every 7-10 days, and irrigated 2-3 times in a row.

2.According to the "soil moisture and plant size" to determine the amount of irrigation, in order to "thoroughly irrigate the root range of crops" for the purpose, generally 100-400ml of irrigation solution per plant.

Agricultural control folds.

1. Before transplanting or after harvesting, remove weeds in the field and around it, and burn or manure it in a centralized manner; Deep ploughing of the ground to eliminate stubble and dry soil can promote the decomposition of diseased and residual bodies and reduce the source of disease and insects.

2. The nutrient soil of seedlings should be made of sterile soil, and it should be dried for more than three weeks before use;

3. Rotation with non-undergraduate crops, water-drought rotation is the best.

4. Choose disease-resistant varieties, choose disease-free and coated seeds, and if they are not coated, the seeds must be sterilized with seed dressing agent or soaking agent.

5. Seedling transplanting, covering with medicinal soil after sowing, and spraying an insecticide before transplanting, which is the key to disease prevention.

6. Select fields with convenient drainage and irrigation, open drainage ditches, reduce groundwater levels, and achieve no stagnant water when the rain stops; After heavy rain, it is an important measure to clean the ditch system in time to prevent moisture retention and reduce the humidity in the field.

7. For fields with many soil pathogens or serious underground pests, sprinkle or furrow sterilization and insecticidal soil before sowing, 8. Apply compost or rotted organic fertilizer made of enzyme bacteria, without bacterial fertilizer, and the applied organic fertilizer shall not contain the disease residues of this crop.

9. Adopt soil testing and formula fertilization technology, appropriately increase phosphorus and potassium fertilizer, strengthen field management, cultivate strong seedlings, and enhance plant disease resistance, which is conducive to reducing diseases.

10. Timely control of pests, reduce plant wounds, and reduce the transmission route of germs; When the disease occurs, remove the diseased leaves and plants in time, and take them out of the field to burn, and apply pesticides or quicklime to the diseased holes.

11. Grafting for disease prevention, using wild eggplant, poisonous eggplant or red eggplant as rootstock, cultivating eggplant as scion, using splitting method for grafting, which is indeed effective.

Comprehensive measures for the prevention and control of tomato wilt.

(agricultural control and chemical control). Agricultural control: 1. Avoid heavy cropping or continuous cropping, and choose loamy land that has not been planted with "Solanaceae (eggplant, pepper, tomato, cotton, etc.) crops" in 3-5 years.

2. Mix the application of organic fertilizer (fully fermented and rotted) and phosphorus and potassium fertilizer. Nitrogen fertilizer is not biased. 3. Select resistant varieties of Fusarium wilt (refer to the instructions for seed packaging).

4. Seed sterilization treatment: Before sowing, soak the seeds in warm water at 55 degrees for about 10 minutes. 5 Nutrient soil preparation:

The nutrient soil of the seedbed is mixed with biological fertilizer and fully mixed. Chemical control: 1:

500 times the carbendazia soil cover seed. After emergence to before maturity, every 10-15 days, foliar spraying or root irrigation was carried out in rotation with 500 times carbendazim, 500 times dixone, 700 times metroph, 600 times oxazin, 700 times Bacillus subtilis and other fungicides. (This disease is mainly prevented, and once the disease occurs, it is difficult**).

Tomato seedlings can be treated with drugs.

When planting tomatoes, you can also use the method of pesticide control, it is recommended that growers start to irrigate roots to protect at the beginning of the disease of sporadic diseased plants, once every 7 10 days, 3 4 times in a row. The agent can be selected with 600 times of 75% fierce killing dry suspension solution, or 50% carbendazim wettable powder 500 times, or 70% Verdajiatrop wettable powder 500 times, or 10% double-effect spirit water solution 200 times, and about 250 ml of perfusion solution per plant.

In addition, it is also recommended that growers a little, on the other hand, insist on using thin water and light watering during the fruit expansion period, a small amount of many times, when watering tomatoes, remember to water too much or too much at one time, the advantage of this is that it can prevent germs, and carry out secondary transmission in the soil of the tomato field through watering.

Tomato wilt causes

In the process of growing tomatoes, if farmers look closely, they will find that sometimes only one side of the tomato plant is sick, while the stem and leaf growth on the other side is intact and normal. The base of the stem is water-soaked near the ground, and when there is high humidity, it will produce old skin and pink, white, or some blue-green mold. For example, the soil is heavy and acidic, which is most likely to cause the soil to contain certain germs, which can also lead to tomato wilt.

In other words, because there are some pests such as nematodes in the soil where tomatoes are grown, these pests are then transmitted to tomato plants for secondary transmission. It may be due to the fact that the tomato has some germs in its nutrient soil or organic fertilizer, which is not fully rotted when planting, which will also lead to this situation, and the servant is almost when fertilizing the tomato, the nitrogen fertilizer is too much, and if the weather is bad, it will also make the tomato susceptible to similar diseases.

The best way to wilt tomato seedlings is:

1. The soil temperature is too low.

If the soil temperature is lower than 9-11 for a long time, the water absorption capacity of the tomato root system will be reduced, and the plant moisture will be out of balance, which will be manifested in the wilting of the stems and leaves of the plant, and find a way to stabilize the ground temperature above 10, and the tomatoes with wilted stems and leaves can be improved.

Second, the root system is damaged.

The stems and leaves of tomatoes wilt, followed by root damage, the root system of the plant has problems, its absorption capacity will decrease, the ability to absorb water becomes worse, for tomatoes with damaged roots, you can dig the plant out of the soil, cut off the rotten and shriveled roots, and re-pot the soil after a little rooting.

3. Air drying.

The wilting of the stems and leaves of tomatoes may also be caused by dry air, such as continuous rainy days after sudden sunshine, or when the wind is too rapid during the high temperature period, the air will become very dry, the leaves of tomatoes lose water too quickly, and the water absorption capacity of the root system can not meet the transpiration and water loss of the leaves, which will lead to wilting of the plants, and the air humidity of the maintenance environment can be improved.

Fourth, excessive fertilization.

The stems and leaves of tomatoes wilt, and finally it may be caused by excessive fertilization, such as a large amount of chemical fertilizer, resulting in the salinization of the soil for planting tomatoes, resulting in too low water potential around the roots of the plant, which affects the water absorption of the root system of the plant.

Summary. First, the soil temperature is too low tomato stems and leaves wilting, first of all, it may be caused by too low soil temperature, if the soil temperature is lower than 9-11 for a long time, the water absorption capacity of tomato roots will be reduced, plant moisture ** imbalance, it will be manifested in the wilting of plant stems and leaves, find a way to stabilize the ground temperature above 10, the tomatoes with wilted stems and leaves can be improved.

Second, the stems and leaves of tomatoes with damaged roots wilted, followed by root damage, the root system of the plant has a problem, its absorption capacity will decrease, and the water absorption capacity will become worse, for the root system of damaged tomatoes, the plant can be dug out of the soil, the rotten and shriveled root system is cut off, and the roots are slightly dried and re-potted in the soil.

Third, the stem and leaves of the tomato with dry air wilting, may also be caused by dry air, such as continuous rainy days after sudden sunshine, or in the high temperature period when the wind is too urgent, the air will become very dry, the leaves of tomatoes lose water too quickly, the water absorption capacity of the root system can not meet the leaf transpiration and water loss, it will lead to wilting of the plant, and find a way to increase the air humidity of the maintenance environment can be improved.

Fourth, the stems and leaves of tomatoes with excessive fertilization wilted, and finally it may be caused by excessive fertilization, such as a large amount of chemical fertilizer, resulting in the salinization of the soil for planting tomatoes, resulting in low water potential around the roots of the plant, which affects the water absorption of the root system of the plant.

What to do if tomato seedlings wilt.

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Hello, dear, is answering this question for you, wait a minute.

First, the soil temperature is too low tomato stems and leaves wilting, first of all, it may be caused by too low soil temperature, if the soil temperature is lower than 9-11 for a long time, the water absorption capacity of tomato roots will be reduced, plant moisture ** imbalance, it will be manifested in the wilting of plant stems and leaves, find a way to stabilize the ground temperature above 10, the tomatoes with wilted stems and leaves can be improved. Second, the stems and leaves of tomatoes with damaged roots wilted, followed by root damage, the root system of the plant has a problem, its absorption capacity will decrease, and the water absorption capacity will become worse, for the root system of damaged tomatoes, the plant can be dug out of the soil, the rotten and shriveled root system is cut off, and the roots are slightly dried and re-potted in the soil. Third, the stem and leaves of the tomato with dry air wilting, may also be caused by dry air, such as continuous rainy days after sudden sunshine, or in the high temperature period when the wind is too urgent, the air will become very dry, the leaves of tomatoes lose water too quickly, the water absorption capacity of the root system can not meet the leaf transpiration and water loss, it will lead to wilting of the plant, and find a way to increase the air humidity of the maintenance environment can be improved.

Fourth, the stems and leaves of tomatoes with excessive fertilization wilted, and finally it may be caused by excessive fertilization, such as a large amount of chemical fertilizer, resulting in the salinization of the soil for planting tomatoes, resulting in low water potential around the roots of the plant, which affects the water absorption of the root system of the plant.