How to prevent and control tomato wilt! What is the control method of tomato wilt?

Tomato wilt.

Prevention and control methods] 1. Soil treatment When recreation in the shed, soil disinfectants such as Weibaimu and calcium cyanide can be used for soil disinfection.

2. If you have been infected, it is recommended to use methyl frost and chlorethoxen, fludioxonil, copper ammonia, prochloraz, methyl phosphorus, pentachloronitrobenzene, ethylallicin, chlorobromoisocyanuric acid, Pythium oligoandrosis, Bacillus subtilis and other root irrigation control.

The main measures to control tomato wilt are:

First, select resistant varieties and carry out seed disinfection.

There are significant differences in resistance between varieties of the disease, and disease-resistant and disease-resistant varieties can be selected according to region or time. It is advisable to select seeds from disease-free plants. Seed sterilization.

Before sowing, soak the seeds in 52 warm water for 30 minutes, or soak the seeds with copper sulfate for 5 minutes, wash and germinate, and sow seeds. Second, agricultural prevention and control.

Crop rotation. The diseased area should be rotated with non-Solanaceae plants for more than 3 years, preferably with water-drought rotation. Use new soil seedlings or bed soil for disinfection.

8 10 grams of 50% carbendazim wettable powder per square meter of bed, add 4 5 kg of fine soil and mix well, first sprinkle 1 3 medicinal soil on the furrow, then sow seeds, and then cover the rest of the medicinal soil on the seeds. Strengthen cultivation management. Apply fully decomposed organic fertilizer, adopt formula fertilization technology, and appropriately increase potassium fertilizer to improve plant disease resistance.

If sporadic disease plants are found, they should be uprooted in time, and the disease holes should be disinfected with quicklime. Third, pharmaceutical prevention and control.

Prompt medication at the beginning of the disease. You can choose to spray with 50% carbendazim wettable powder or 36% thiophanate-methyl suspension 500 times liquid, in addition, you can use 10% double-effect liquid 200 times liquid to irrigate the roots, irrigate once every 7 10 days, and irrigate 3 4 times continuously.

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.

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.

Drugs can be used**, and some drugs to prevent wilt can be used in the early stages, so that the tomatoes can grow better and do not develop diseases.

First of all, we should water and fertilize in a timely manner, strengthen water and fertilizer management, spray pesticides regularly, remove insect pests in time, ensure sufficient sunlight, and also do a good job in ventilation and drainage, choose the right pesticides, prescribe the right medicine, and pay attention to the proportion and dosage of pesticides.

It is necessary to water in time, fertilize in time, strengthen ventilation, pay attention to the density of planting, and carry out field management in time.

First of all, it is necessary to pay attention to the appropriate planting temperature, then be sure to avoid direct sunlight, and at the same time should choose the right pesticide for spraying, and then be sure to pay attention to the appropriate way of medication, as well as to water and fertilize in time.

<> "Fusarium wilt is one of the common diseases of tomatoes, and it is generally more likely to suffer from it during the flowering and fruiting period. Diseased plants wilt at noon and recover in the morning and night. The leaves will turn yellow from the bottom to the top and eventually die completely.

Diseased leaves need to be cut off immediately to avoid further deterioration. It is then sprayed with a spray of R. solanacear, Wolfonol and garlic oil on the surface of the plant, while the roots are irrigated. It is also necessary to pay attention to ventilation and drainage and do a good job of prevention.

1. Manifestations of disease.

Fusarium wilt occurs during the flowering and fruiting period of tomatoes, especially during the fruiting period, which causes the plant to die. At the beginning of the disease, the middle and lower leaves of the plant will wilt at noon, but will recover sooner or later and at night. After that, the leaves will gradually turn yellow from the bottom to the top, but they will not fall off, and the plant will slowly die.

It may develop disease on one side of the plant and still grow healthily on the other side.

2. Causes of the disease.

There are many causes of tomato blight. For example, the soil is heavy and acidic, and it contains certain germs. Or it is due to the presence of nematodes and other pests in the soil, which are transmitted to the plants.

It may also be due to nutrient soil or organic fertilizer carrying bacteria, which is not fully decomposed. In addition, too much nitrogen fertilizer, or continuous rainy weather after sunshine, can also make it easy to suffer from disease. Sun He.

3. Method.

For blight, the first thing to do is to remove the more severely diseased leaves, so that they do not continue to deteriorate or spread to other parts. The plucked leaves should be burned to completely destroy the germs. Then make a spray with R. solanacear, vofonin and garlic oil, while also irrigating the roots.

If the condition is more severe, thiophanate-methyl needs to be added**.

Fourth, how to prevent it.

To prevent tomato wilt, we must first select varieties with strong disease resistance, and bet on crop rotation and stubble, during which we must remove weeds and turn the soil deeply. If nutrient soil is used, it needs to be sterilized and put in a sunny place to dry for about three weeks. When transplanting, it is necessary to pay attention to spraying fungi, and in the rainy season, it is necessary to do a good job of drainage, and use well-rotted organic fertilizer for irrigation.

Phenogen. There are many causes of tomato blight. For example, the soil is viscous and acidic, and it contains germs.

It can also be spread to plants because there are nematodes or other pests in the soil. Or because of nutrient soil or organic fertilizer carrying bacteria, resulting in insufficient decomposition. In addition, excessive application of nitrogen fertilizer, or continuous rainy weather after sunny weather, can also cause disease.

**。For blight, the first thing to do is to pluck the leaves that are more diseased, so that the blight does not continue to worsen or infect other parts. Burn the harvested leaves to completely destroy the germs.

Then water the rhizomes with R. solanacear, Wolfonin and garlic oil. If the disease is more severe, thiophanate-methyl** is required.

How to prevent it. To prevent tomato wilt, we must first choose varieties with strong disease resistance, and pay attention to ploughing, and at the same time remove weeds and deep soil. If nutrient soil is used, it needs to be sterilized and placed in a sunny place for about 3 weeks.

Attention should be paid to spraying fungicides when transplanting seedlings, drainage should be done in the rainy season, and rotting organic fertilizer should be used for irrigation.