Tomato wilt and wilt are very similar, how to distinguish tomato wilt from wilt?

These two diseases can wilt and even cause death in tomato plants. The easiest way to identify the stem is to cut the stem longitudinally and place it in a clear glass filled with water. If there is a mucus overflow, it is bacterial wilt, and if there is no mucus overflow, it is wilt.

Rosotanacy is originally a bacterial disease with varying degrees of dryness in the leaves, adventitious roots at the base of the plant, hollow stems, and wilted tomatoes. If you cut the base of the stem, you can clearly see that the color of the vascular bundles has changed to brown. It is because these vascular bundles are destroyed that nutrients and water cannot be transported upwards properly, causing tomatoes to wilt.

Experts from the vegetable medicine network remind everyone that if tomato bacterial wilt is not timed, it will wilt and die many times, bringing great losses to vegetable farmers.

Fusarium wilt usually begins to appear after planting. At the beginning of the disease, the leaves near the ground turn yellow, and finally turn brown and die, and the dead leaves remain on the stem without falling off; Some stems have yellow leaves on one side and normal colors on the other. There are also some shoots that have half yellow leaves and half normal leaves.

When the disease is severe, the diseased leaves are from the bottom up, and finally only the parietal lobes remain, and the rest die. The condition is mild, only the yellow leaves near the ground, the rest are normal. The roots of the diseased plants are brown rot or local necrosis, and the vascular bundles are yellow-brown when the stem base is dissected.

Experts from the Vegetable Medicine Network believe that the main symptom of this disease is different from bacterial wilt is that the leaves of the plant turn yellow after getting this disease, and pink mold tends to grow at the base of the stem when wet. Moreover, bacterial wilt is less harmful to the root system.

An effective way to control both of these diseases is to water the roots with chemicals, but to take precautions. When choosing drugs, it is best to choose drugs with strong systemic properties, such as chlorobromoisocyanuric acid, copper rosinic acid, etc. For disease-free tomatoes, a protective spray with streptomycin, mesobiomycin and androcides can be used to prevent bacterial wilt.

For the prevention and control of Fusarium wilt, carbendazim + formecil + oxazine can be used as root irrigation with remarkable effect. Tomato plants that have died from the disease should not be discarded in the greenhouse, but buried deep outside the greenhouse while the soil is disinfected. R. solanacearum and Fusarium wilt can be transmitted by running water, and flooding can cause rapid spread of pathogens.

Therefore, experts remind everyone that it is strictly forbidden to flood irrigation in greenhouses with symptoms of dead trees. And pay attention to irrigating the roots before watering.

In fertilization, it is necessary to pay attention to the rational use of nitrogen fertilizer, and apply more organic fertilizer and phosphorus and potassium fertilizer to enhance the disease resistance of plants. At the same time, pay attention to cultivating strong roots. Fusarium wilt and bacterial wilt are diseases that infect vascular bundles, block vascular transport, and affect water and nutrient transport.

If the stem of the diseased tomato plant has a rough stem skin with aerial roots, it is bacterial wilt. Fusarium wilt has no aerial roots. In addition, the stems can also be cut and squeezed in clean water.

If bacterial pus is present, tomato bacterial wilt can also be diagnosed. Bacterial pus is a unique symptom of bacterial disease, and the time from onset to death of bacterial wilt is short, with death in 2-3 days under high temperature and dry soil, and about 7 days under low temperature and high soil moisture. Fusarium wilt has a longer course of disease, from onset to death, which can be as long as 20 days to 1 month.

This can also be used as a reference for diagnosis.

Tomato bacterial wilt is a bacterial disease, mainly affecting stems and leaves, generally in the adult stage, first the parietal leaf wilts and droops, then the lower leaves wilt, and finally the middle leaf wilts, and there is also one side of the leaf wilts first or the whole plant leaf wilts at the same time. At the beginning of the disease, the diseased plants wilt during the day and recover in the evening, and the diseased leaves are light green. If the soil is dry and the temperature is high after the onset of the disease, the whole plant withers in 2 3 days, if the temperature is low, continuous rain or the soil moisture content is high, the diseased plant can last for 5 7 days and then die, but the leaves still remain green or light green, so it is called bacterial wilt.

Diseased stems may be found to be water-soaked and then brown patches. Transverse section of the diseased stem shows that the vascular bundles are brown, and the tender stems are pressed by hand, and white bacterial fluid can be seen overflowing from the vascular bundles on the section, which is a typical symptom of bacterial wilt.

Fusarium wilt, also known as wilting disease, is a soil-borne bacterial disease, mainly affecting rhizomes. Generally, the onset of the flowering and fruiting period, the middle and lower leaves of the initial plant wilt and droop around noon, and return to normal in the morning and evening, the leaf color is slightly light, like the symptoms of lack of water, and finally die, but the leaves do not fall off. Sometimes only one side of the plant is affected, and the other side grows normally.

The base of the stem is water-soaked near the ground, and when wet, it produces pink mold, i.e., molecular sporozoite and conidia. Transsection of the diseased stem shows that the vascular bundles are brown, and the sterile fluid exudes by hand squeezing, which is the main difference from bacterial wilt.

Bacterial wilt and wilt are both important diseases of nightshades. On the surface, these two diseases are similar: they are both soil-borne diseases, and the disease of continuous cropping is severe; After the onset of the disease, the plants showed aboveground wilting. Leaves that begin to wilt at the beginning of the disease can recover sooner or later; Severe occurrence of low-lying land and sunny weather after rain; The vascular bundles of the diseased plants all turned brown.

However, there is a big difference between the two diseases, with bacterial wilt being a bacterial disease and wilt being a fungal disease. In addition, from the perspective of pathogenesis, there are also great differences between the two diseases:

At the beginning of the disease, the cortex at the base of the stem of the blighted plant was water-soaked and gradually turned brown, and the plant gradually turned yellow and wilted from bottom to top. However, bacterial wilt does not have this kind of flooding, and the upper part of the plant wilts first, followed by the lower part, and finally wilts in the middle.

Fusarium wilt plants often wilt on one side and normal on the other, or at least some plants in the field, but bacterial wilt is almost absent.

Tomato bacterial wilt is a bacterial disease caused by infection with Pseudomonas solanacear. Generally, when the tomato plant is about 30 cm tall, the bacterial wilt plant begins to show symptoms. First, the top leaves wilt and droop, then the lower leaves wither and do not turn yellow, the middle leaves finally wilt, and there are also one side of the leaf wilting first or the whole leaf wilting at the same time.

Tomato wilt meaning:

Tomato wilt socks celery disease is also known as bacterial wilting disease. Symptoms are not present at the seedling stage. The disease begins at the beginning of tomato fruit set.

First, the top leaf wilts and droops, then the lower leaf wilts, and the middle leaf wilts the latest. The diseased plants wilted significantly at noon during the day at the beginning of the day, and returned to normal at night. At this time, if the soil is dry and the temperature is high, the whole plant will wither after 2 or 3 days of celebration until it dies.

If the temperature is low, continuous rain or the soil moisture content is high, the diseased plant can last for about a week before dying, and the plant will remain green after death. The epidermis at the base of the stem of the diseased plant is rough, and a large number of roots of different lengths are often produced. When the weather is wet, 1 2 cm patches may appear on the diseased stems that are water-stained and then brownish.

Bacterial wilt is a bacterial disease caused by infection with the bacterium Pseudomonas solanacium. The disease mainly lives with the remains of diseased plants in the soil for 1 6 years.

Tomato wilt control methods:

1. Crop rotation. The pathogen overwinters in the soil with mycelium or thick-walled spores with the diseased residues, and invades the host from the young tomato roots or wounds in the second year, causing the disease to occur. Therefore, crop rotation with non-solanaceae crops should be implemented for more than 3 years.

2. Disinfection of bed soil. Using new soil, 8 10 grams of 50% carbendazim wettable powder and 4 5 kg of fine soil are mixed with 4 5 kg of fine soil per square meter of bed surface, and the medicinal soil is used to pad the bed and cover the seeds when sowing.

3. Seed disinfection. Soak seeds in warm water at 52 degrees for 30 minutes, or soak seeds in 500 times of 500 times of carbendazim wettable powder for 1 hour, wash and then germinate and sow seeds.

4. Pharmaceutical prevention and control. At the beginning of the disease, spray 500 times of 50% carbendazim wettable powder, or 500 times of 50% methyl tobuzin wettable powder, or irrigate roots with 10% double-effect liquid 200 times, once every 7 10 days, and irrigate 2 3 times continuously.

Symptoms of tomato wilt: leaves, stems.

1. a blade

Although there is infection at the seedling stage, it does not show symptoms. In the early stage of tomato fruit set, the top, lower and middle leaves of the diseased plant wilted one after another, and one side of the leaf wilted first or the whole leaf wilted at the same time, which was obvious at noon and returned to normal after evening.

If the soil is dry and the temperature is high, it will die after a few days. The death time of the diseased plant wilting is very short, and the plant still remains green when it dies, and only the color of the leaves is slightly lighter, so it is called bacterial wilt.

2. Stems

The epidermis of the diseased stem is rough, adventitious roots or adventitious buds are proliferated in the middle and lower parts of the stem, and 1 2 cm patches that are initially water-soaked and then brown can be seen on the diseased stem when the humidity is high. The vascular bundle of the diseased stem turns brown, the diseased stem is cut horizontally, squeezed by hand or moisturized, and the vascular bundle overflows with white bacterial solution on the section. An important feature that distinguishes bacterial wilt from wilt is that it has a rapid onset and severe disease dies after 7 to 8 days.

Tomato wilt control methods:

1. Agricultural prevention and control

2. Strengthen the management of field ears: select high and dry land, sow early in a timely manner, advocate nutrient bowl seedlings, reduce root damage, high furrow and deep ditch, reasonable dense planting, timely ditch drainage after rain, prevent water accumulation, appropriately increase nitrogen fertilizer and potassium fertilizer, pay attention to cultivating technology and adjust soil acidity, timely remove diseased old leaves, and increase field ventilation and light transmission.

3. Clean the garden: pull out the diseased plants in time, and pour 20 lime water into the sick holes for disinfection. After harvesting, the diseased residues are removed, and the fields are taken out of the field to be buried or burned, and the soil is turned deep to accelerate the decay and decomposition of the diseased residues.

2. Biological control

At the beginning of the disease, spray 3 600-800 times of Zhongshengmycin, or 72 Streptomycin sulfate soluble powder with 4000 times of liquid spray, or 300 billion grams of Pseudobacillus fluorescens powder 6500 grams of preparation of hectares of root irrigation, or 1 billion efu grams of Bacillus polymyx, 680 grams of preparation per mu diluted after root irrigation.

The above content reference: Encyclopedia - Tomato wilt.

It is mainly due to the occurrence of pests and diseases in the environment of high temperature and humidity of plants. The temperature should be kept at around 25 degrees. The soil is moist and should not be watered too much. In case of disease, plant-specific insect repellent should be used in a timely manner.

Symptomatic tomato wilt has become a devastating disease that can infect at seedling stage, usually during flowering and fruiting stages. Diseased plants are still green when they die, and their leaves become pale and wilted. The middle and lower cortex of diseased stems are rough, and adventitious roots and adventitious buds often grow.

The vascular bundles of the diseased stem are black-brown in color, squeezed with high humidity by hand, and white bacteria overflow. Causes and regularities of the disease Pathogens are transmitted through rain, irrigation water, pests and farm tools, mostly from skin holes and wounds at the base of roots or stems. When conditions are right, the pathogen multiplies rapidly within the vascular bundles and expands upward along the duct, blocking the duct and impeding the upward transport of water, resulting in wilting.

It is easy to develop diseases under high temperature, high humidity and acidic conditions, and the disease can be aggravated by root injury, poor drainage and low planting furrow. What are the symptoms, causes and control measures of tomato bacterial wilt? Preventive measures: selection of disease-resistant varieties or disease-resistant rootstocks, planting of grafted seedlings; Appropriate application of lime to adjust soil pH; The planting of high furrows should not be too deep; Frequent irrigation with small amounts of water to remove stagnant water in the field in a timely manner; Early ploughing and early hoeing to avoid root injury; Immediately remove the diseased strains and disinfect them with lime; At the beginning of the disease, the roots were irrigated with 20% phycozole wettable powder or 3% mesomycin wettable powder.

Bacterial wilt is impaired conduction function caused by infection with a pathogen. Common chemicals only kill bacteria in the soil and hairy roots, but it is difficult to reach the inside of the vascular bundles to sterilize.

When you are sick, you should quickly disinfect and repair damaged cells and restore conduction function. Traditional medicine does not have the ability to repair damaged cells. R. solanacearum has the characteristics of acute and severe disease, and it is necessary to continue to use medication to reduce the number of bacterial sources and control the reproduction rate of bacteria.

There are too many commonly used drugs that are resistant, and if they are heavy, they are worried about causing drug damage, resulting in less drugs. Traditional medicine often irrigates the root system with medicine, but when the disease is high, the soil water content is high or even saturated, and it is difficult to irrigate the root system with medicine to kill the bacteria in the soil and roots.

The above reasons make it difficult to use the incidence of bacterial wilt. The traditional Chinese medicine preparation Qingguli occupies a place in the market because of its unique advantages. Qingguli is made by chelating and fermenting more than 20 kinds of Chinese herbs.

It is compatible with plants, has high safety, does not produce resistance, and can be used continuously. It contains Houttuynia cordata and comfrey to repair damaged cells and promote wound healing. The above characteristics correspond to the causes of bacterial wilt, so traditional Chinese medicine has advantages in the prevention and control of difficult diseases such as tomato bacterial wilt.

The reason for this is actually that there are toxins in it, and when the soil is particularly dry, such toxins will be produced, the best solution for the first point is actually to carry out all-round watering, the second point should be all-round light, and the third point should pay attention to fertilization, these are good solutions.

Bacterial wilt is an important disease of tomato and is a bacterial disease. Rational application of nitrogen fertilizer, increased application of potassium fertilizer, medium and trace elements, application of fully decomposed organic fertilizer or plant ash, if necessary, as root top dressing;

What to do if tomato has wilt? Tell you 1 "secret" that is easier to solve.

Causes of bacterial wilt:

Bacterial wilt is a bacterial disease and is a soil-borne disease. For many years, the disease is serious in the continuous cropping plots, such as the Honghe area of Yunnan, many greenhouses are planted for 10 years, and the incidence of bacterial wilt is serious. Pathogens that have been around for many years often lurk in the soil and multiply in large numbers.

The plant grows weakly, has poor disease resistance, is easy to die, and is easy to die.

Pathogenesis:

Bacteria invade from the wounds and stomata of roots or stems, and spread in the vascular tissues, causing duct blockage, vascular bundle damage, and when the light is strong at noon, more water is needed but less water is actually transported, and the leaves naturally wilt in short supply.

R. wilt control measures:

1.Uproot the diseased tomato plants and sprinkle an appropriate amount of quicklime or plant ash or 20% lime water in the diseased hole to prevent the spread of the disease.

2.Pay attention to water and fertilizer management, and achieve a reasonable combination of nitrogen, phosphorus and potassium; Drain water in time after rain to avoid flooding, which can lead to expansion.

3.For plants that are not infected with the disease, foliar spraying or root irrigation microbial agents can be applied to enhance the disease resistance of tomato plants, so as to prevent tomato bacterial wilt.

4.Wounds at the base of the roots or stems of bacterial wilt plants invade, and adult pests can cause plant wounds, so insecticides should be applied in plots where adult damage is serious.

pest control.

5.When the first symptoms of tomato bacterial wilt appeared, irrigate the roots with 600 times of 4% pyrimidine nucleoside antibiotics, or 4000 times of 72% agricultural streptomycin sulfate soluble powder, or 4000 times of new phytomycin, and irrigate each plant once, 8 10 days, 2 3 times. or azoxystrobin-difenoconazole suspension 1500 times + 40% carbendazim-pentachloronitrobenzene 800 times + 2% chunleimycin wettable powder root irrigation treatment.

When the onset of bacterial wilt is severe, you can try to apply octylamine acetate for root irrigation, each plant is irrigated with a liter of pesticide solution, irrigated once every 7 10 days, and used 2 or 3 times in a row, which can achieve a better control effect.