What should I do if my tomatoes have black rod disease, and what should I do if my tomato stalks tur

The method of tomato black rod disease is as follows:

Dilute R. solanacearum by 600 times, 3 liters per square meter before sowing or after sowing and before planting seedbed, at the time of planting or after planting and before the expected disease period, D. solanacearum Rick is diluted by 600 times, irrigation, medication every 7 days, the number of drugs depends on the condition. Of course, when used for the first time, R. solanacearum can also be diluted according to 500 times the solution, and when the disease is serious, the dosage can be appropriately increased. It can also irrigate the roots or small area of the plants within 2-3 meters around the diseased plant and the diseased plant, if the pathogen is harmful to the aboveground part at the same time, it should be sprayed at the same time as the root irrigation, and the aboveground part should be sprayed at the same time, and the drug should be used once every 5 days.

Tomato black rod disease is generally infected with early blight, late blight, stem base rot and other diseases, generally early blight can be prevented and controlled by spraying 1000 times of 50% Nongli Ling wettable powder, and late blight can generally be sprayed with 800 times of Pulik water solution or 500-600 times of 72% Kelu wettable powder in the early stage of the disease. Stem base rot can be sprayed on the stem base and surface of the plant with R. solanacearum rick (100-150 times the solution) + garlic oil (1000-1500 times the solution), and if the disease is more serious, other fungicides can be compounded.

There are many reasons for the blackening of tomato stems, "black stalks" can be divided into two kinds according to the disease site, one is browning and blackening at the base of the stem, the other is black brown spots in the middle and upper part of the stem or at the branch, etc., the appearance of "black stalks" at the base is caused by two diseases: stem base rot and phytophthora root rot, and the "black stalk" at the stem or branch is usually caused by tomato early blight, late blight, stem blight, and stripe spot virus disease. When the disease is mild, the plant grows slowly, the growth gradually weakens, the yield decreases, and in severe cases, the plant wilts and dies. So today, let's talk about tomato "black stalk" disease control measures.

Why do tomato stalks turn black? Tomato "black stalk" disease control measures.

1. Prevention and control of stem base rot.

Stem base rot: Stem base rot is also known as large seedling blight, light brown arachnoid mold can be seen in the later stage of the disease, and the plant gradually withers and dies.

Control: 1200 times of 20% methyl phosphorus emulsifiable concentrate mixed with 95% Lvheng No. 1 (Oxalen) 3000 times solution for root irrigation control.

2. Prevention and control of Phytophthora root rot.

Phytophthora root rot: dark brown spots at the base of the stem, depressed lesions, and brown ducts can be seen at the base of the longitudinal stem.

Prevention and control: Root irrigation was carried out with Pulik 800 times solution mixed with 50% DT 500 times solution mixed with 80% Jinnahai (Fumeishuang) 750 times solution.

Why do tomato stalks turn black? Tomato "black stalk" disease control measures.

3. Early and late blight.

Early blight: irregular brown spots on the stems or branches, and black mold layer when humidity is high.

Late blight: The stems or branches are thinner and blackish-brown, and the diseased fruits have distinct cloud spots.

Prevention: Direct spraying of 68% Jinredomir (Methyl Frost + Mancozeb) 800 times solution for prevention and control.

Fourth, stem blight.

Stem blight: oval brown lesions are produced on the stems, which expand up and down, and later lesions can invade the vascular bundles.

Prevention and control: spray 1000 times of 50% promethanin wettable powder for prevention and control.

I guess it was caused by that store, and it almost turned black.

If the base of the stem is black, it may be infected with stem base rot and Phytophthora root rot, and the stem base rot is irrigated with 20% methyl phosphorus emulsifiable concentrate 1200 times, 95% oxachlor 3000 times solution, and Phytophthora root rot with 800 times of Prik solution and 80% Fumeishuang 750 times solution to irrigate the roots. If the stalk or branch is black, it may be infected with early blight, late blight, stem blight, and stripe virus disease, and it is necessary to distinguish the corresponding spraying of the disease**.

Symptoms: Tomato black spot is also known as nail spot and finger spot. It mainly damages fruits, leaves and stems.

The infected lesions of the fruit are grayish-brown or brown, round to oval and slightly concave, with distinct edges. There are one or several lesions on the fruit, which vary in size, and the spots have black mold, i.e., conidia and conidia.

Pathogen: Alternaria Tomato WeberIt is called Alternaria tomato, which is a fungus of the subphylum Semi-Knowitives.

Conidia 2 or several bundles, dark brown, pale at the apex, slightly larger at the base, many septums, unbranched, 111-128 6-8 microns in size; Conidia solitary or 2 in a bunch, inverted rod-shaped, brown, with 4-12 diaphragms, 0-10 mediastinums, constricted between septums, spores 39-69 15-24 microns in size, beak long, with several diaphragms, 56-132 2-3 microns in size.

Transmission route and pathogenesis conditions: Mycelium or conidia clumps and conidia are overwintered in the soil with the diseased residues, and the conidia are spread by airflow in the following spring, and the initial infection and re-infection are carried out. The bacterium is weakly parasitic and has a wide host range, and is usually attacked by this bacterium only when the plant grows weakly or the fruit has wounds.

Warm and humid weather is favorable for the development of the disease.

Control methods: 1) Strengthen water and fertilizer management, so that the plant can grow steadily and reduce damage.

2) Early spraying prevention, spraying 50% promethanein wettable powder 1000-1500 times liquid, 75% chlorothalonil wettable powder 600 times liquid, 58% methalin manganese zinc wettable powder 500 times liquid, 50% Dafudan wettable powder 500 times liquid, 80% spraying wettable powder 600 times liquid, if the above-mentioned fungicide can be mixed with 4000 times of multi-effect solution, the effect of medicinal fertilizer can be obtained.

Don't eat tomatoes if they have black spots, just throw them away, eating them will make people unhealthy.

Tomato black rod disease is a manifestation of tomato late blight disease on the stem, the damage is serious and the loss is large, the stem, leaf and fruit can be diseased, and the prevention and control of pesticides should be stepped up at the same time. The main prevention and control methods are: reasonable dense planting, timely pruning:

Adopt small high furrows, large and small ridge cultivation, plant 3000-3300 plants per mu, adopt a single stem pruning method, except for the main trunk and other side branches are all knocked off one after another, and remove the old leaves under a panicle fruit in the middle and late stages, increase ventilation and light transmittance, and avoid the occurrence of diseases; Increase the application of organic fertilizer and supplement phosphorus and potassium fertilizer: organic fertilizer can improve the content of soil organic matter, increase soil aeration, provide tomato demand for trace elements, and phosphorus and potassium fertilizer is conducive to cultivating robust plants and increasing disease resistance; Chemical prevention and control: timely use of drugs in the early stage of the disease, spray with 64% alum 500 times, or Pulik water 800 times liquid, 7-10 times; Remove diseased leaves, diseased fruits, and seriously diseased plants in a timely manner, and bring them to the field for deep burial.

Tomato black rod disease is a common disease that directly affects the yield and quality of tomatoes. It is caused by a pathogen called the "bacterial spot virus". The pathogen can multiply in large quantities in the tomato plant, resulting in yellowing, wilting or nucleation of the plant, and deformation of leaf masses.

In order to effectively control tomato black rod disease, the use of drugs is a feasible approach. First of all, it is recommended to use drugs containing benzoylmeme, such as chlorothalonil, air digging benzochloride, etc. These drugs can effectively inhibit the reproduction of tomato black rod pathogens, thereby reducing its damage to plants.

Secondly, you can use drugs containing beltmycin, such as emulsifiable concentrate. These drugs can effectively control the occurrence of tomato black rod disease, and can also control some other pests and diseases.

However, it should be noted that when using the drug, it is important to strictly follow the instructions and pay attention to safety. In addition, you can also choose some organic pesticides, such as xanthrocyte, to reduce the pollution of drugs to the environment.

In short, tomato black rod disease has a great impact on tomato production, in order to reduce economic losses, it is a feasible way to choose suitable drugs. However, in the process of using drugs, it is necessary to follow the relevant regulations to ensure that they are safe and harmless.

Tomato black rod disease is generally caused by early blight, late blight, stem base rot and other diseases.

Generally, early blight can be sprayed with 1000 times of 50 Nongli Ling wettable powder, and late blight can generally be sprayed with 800 times of Pulik water solution or 500-600 times of 72 grams of dew wettable powder in the early stage of the disease.

Stem base rot can be sprayed on the stem base and surface of the plant with R. solanacearum rick (100-150 times the solution) + garlic oil (1000-1500 times the solution), and if the disease is more serious, other fungicides can be compounded.

When planting tomatoes, it is necessary to plant them in a reasonable and dense manner, and the plants need to be pruned in a timely manner. It is best to plant about 3,000 tomato plants per acre, and choose the method of single-stem pruning when pruning the thick bedrock of the West Red Rock persimmon, leaving only the main trunk and removing the remaining side branches.

When fertilizing, the amount of organic fertilizer can be increased appropriately, and phosphorus and potassium fertilizer can be supplemented. The application of organic fertilizer can increase the content of organic matter in the soil and increase the air permeability of the soil.

Precautions for growing tomatoes

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.

Tomatoes are temperature-loving vegetables, and generally speaking, they can be adapted to tomato growth in the temperature range of 15 to 35 years. 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.

<> the blackening of the stalks of tomatoes may be due to stem base rot or diseases such as Phytophthora root rot, late blight, stem blight, bacterial medullary necrosis, etc. Prevention and control of stem base rot and Phytophthora root rot: you can spray with R. solanacearum + garlic oil.

Prevention and control of late blight and stem blight: Root irrigation can be carried out with R. solanacearum + Diliwang + Wofengsu. Prevention and treatment of bacterial myeloid necrosis:

It can be sprayed with bacterium Biqing.

1. What is the disease of tomato stalk blackening?

1. The stalk at the base of the stem is blackened: it is generally caused by diseases such as stem base rot or Phytophthora root rot; During the control, the stem base and surface of the plant can be sprayed with R. solanacearum (100-150 times the solution) + garlic oil (1000-1500 times the solution).

2. Blackening of the middle and upper part of the stem or branch: it is generally caused by diseases such as late blight, stem blight, bacterial medullary necrosis, etc.; In the prevention and control of late blight and stem blight, the middle and upper stems of the plant can be sprayed with R. solanacearum (100-150 times solution) + garlic oil (1000-1500 times solution), or the roots can be irrigated with R. solanacearum (150-300 times solution) + Diliwang (300 times solution) + Wofonsu (600 times solution); In the prevention and treatment of bacterial myeloid necrosis, drugs such as bacterial Biqing (300 times liquid) can be sprayed, sprayed once every 3-4 days, and sprayed 3-4 times in a row.

2. Is the blackening of tomato stalks contagious?

The black stalks of tomatoes can be transmitted to other plants, and when the humidity in the shed is high and the greenhouse film is prone to condensation and dripping, it is easy to spread pathogens such as late blight and stem blight.

Hello, the "black stalks" at the stalk or branch are usually caused by tomato early blight, late blight, stem blight, and stripe virus disease.

Causes and solutions:

1. Early blight and late blight.

Irregular brown spots on the stems or branches, and black mold when humidity is high. Late blight: The stems or branches are thinner and blackish-brown, and the diseased fruits have distinct cloud spots.

The main drug for the prevention and control of early blight is mancozeb, and the main drug for the prevention and control of late blight is methacryl, so the prevention and control of the above two diseases can be directly sprayed with methacryl + mancozeb for prevention and control.

2. Stem blight.

The oval brown lesions on the stems are produced, expanding up and down, and the lesions can invade the vascular bundles in the later stage, and the pathogenic bacteria that cause the disease are the same as the early blight, which are Alternaria arachisa, and the main drug is also mancozeb during the prevention and control, and 50% of the promethetoin wettable powder can also be sprayed 1000 times.

Prevention and control methods: <>

1. Choose disease-resistant varieties, generally early-maturing varieties and narrow-leaved varieties have a mild disease, and tall trees, large seedlings and large-leaf varieties have a heavy disease.

2. Strengthen field management: it is necessary to implement high ridge cultivation, reasonably apply water-soluble fertilizer to Haihai and Weihai, and seal the ridge in time after planting and slowing down seedlings to promote the occurrence of new roots.

The temperature and humidity should be controlled in the greenhouse, and the ventilation and light transmission management should be strengthened. During the fruiting period, the lower diseased leaves should be removed regularly and buried or burned to reduce the chance of disease transmission.