Tomato umbilical rot What to do?

Umbilical rot, also known as pedicle rot, is a physiological disease, which can occur from the size of the fruit like an abacus bead to the veraison period of the fruit. At first, water-soaked spots appear on the umbilicus of the fruit, and then gradually expand until the diseased part is depressed and brown. Usually the lesion is only 1 2 cm in size, but in severe cases it can extend to half of the fruit surface.

In the later stage of the disease, if it encounters high temperature and high humidity weather, it is easy to rot mold and present black mold. Diseased fruit is colored in advance, but has no commercial value. Most of this disease occurs in the first day.

On the first and second spikes, the fruits on the same inflorescence are diseased almost simultaneously.

There are many reasons for the occurrence of tomato navel rot, some people believe that the soil moisture during the growth period is uneven or unstable, especially in drought, the water is abnormal, the tomato leaf transpiration consumes a large amount of water required to compete with the fruit, and the water required for fruit expansion is consumed by leaf transpiration, so that the fruit loses water, especially when the water in the fruit and the umbilicus is slightly robbed, due to the sudden large amount of water loss of the fruit, the growth and development are hindered, and the umbilical rot is formed. It is also believed that tomato cannot absorb sufficient calcium and boron from the soil, resulting in physiological and metabolic disorders of umbilical cord cells, losing the ability to control water and producing umbilical rot; Or due to too much nitrogen fertilizer in the soil, the vegetative growth is too vigorous, resulting in a lack of calcium in the soil, and the fruit can not replenish the required calcium in time and umbilical rot occurs, especially when the concentration of calcium in the soil is lower, that is, umbilical rot will occur. In addition, too much magnesium, potassium and other elements in the soil, heavy soil clay, and commonly used acidic fertilizers can cause umbilical rot.

The main methods to control tomato navel rot are:

1) Cover with plastic film.

Mulching can maintain the relative stability of soil moisture and reduce the leaching of calcium in the soil, so as to effectively prevent the occurrence of umbilical rot.

2) Appropriate amount of water in time.

Tomato needs a lot of water for normal growth and development, and water should be replenished in time according to the dryness and humidity of the soil and the growth of the plant to maintain the balance of soil moisture**, especially after the fruit begins to expand, the soil should be kept moist. If irrigation is required, it is advisable to use night irrigation (especially in the hot and dry season) to ensure the normal growth of the plant.

3) Reasonable fertilization.

This includes adequate basal fertilizer and special attention to the application of fully decomposed organic fertilizer to improve soil structure and improve water retention capacity. When topdressing, try to use compound fertilizer or well-rotted manure, and do not apply nitrogen fertilizer. In addition, it has been reported that the 30 days after fruit setting of tomato fruits are a critical period for calcium absorption, and 1% superphosphate can be sprayed according to the actual situation, or calcium chloride plus 5 mg of Naa (naphthalene acetic acid).

1% calcium nitrate and love more than 6000 times the liquid, from the beginning of flowering, every 15 days, 2 times in a row.

Tomato umbilical rot is a physiological calcium deficiency disease, and pesticides cannot solve the problem. Tomatoes are deficient in calcium for physiological reasons, not entirely because of the lack of soil, it is recommended that you apply micro-fertilizer seedlings to make money to supplement calcium in tomatoes.

Tomato umbilical rot, how to treat it.

Hello, glad to answer for you. Umbilical rot is a physiological disease caused by water imbalance, calcium deficiency, boron deficiency and other reasons, generally after the appearance, can not be prevented, can only be prevented in advance, the main methods of prevention and control of umbilical rot are: the use of plastic film mulching will be planted tomatoes on the land covered with plastic film, which can keep the soil moisture and nutrients relatively stable, reduce the loss of water and calcium and boron nutrients in the soil, and prevent the occurrence of umbilical rot.

The growth and development of tomatoes need a lot of water, but the water can not be too little or too much, and the water can be properly watered according to the dryness and humidity of the soil and the growth of the plant. Reasonable fertilization and application of too much nitrogen fertilizer will lead to excessive plant growth, so that tomatoes can not absorb enough calcium and boron from the soil, resulting in imbalance in the ability to control water, causing umbilical rot, so reasonable fertilization is required. The selection of disease-resistant varieties is due to the fact that the umbilicus of the Yanrot Xihongdong jujube is the first area to occur, and the varieties with smoother peel and sharper fruit have stronger disease resistance, which can be selected in areas prone to umbilical rot.

Agricultural control. Selection of disease-resistant varieties: the first choice is smoother peel, sharper fruit varieties, this kind of usually has strong disease resistance, in prone areas recommended to use, such as Changchun No. 1, orange Jiazhu and other varieties. [1]

Scientific fertilization: calcium supplementation, sufficient base fertilizer, reasonable coordination. When the soil is deficient in calcium, 50 kg of slaked lime or calcium carbonate per mu is evenly sprinkled on the ground and turned into the cultivated layer.

Apply enough rotted farmhouse manure or chicken manure to increase the nitrogen fertilizer in the top dressing and reduce the nitrogen use rate of the base fertilizer. When applying nitrogen to tomato, if pure nitrogen is applied more than 30 kg mu, it will lead to the serious incidence of umbilical rot, so controlling the amount of nitrogen fertilizer has become the key to increasing tomato yield. In addition, the reasonable combination of calcium, phosphorus and calcium and potassium can significantly increase the total calcium absorption and actual calcium absorption of tomatoes, and improve the quality of tomato fruits.

Extra-root topdressing calcium fertilizer technology: 1 month after tomato fruiting, it is the first period for calcium absorption. At this time, you can spray 1% superphosphate, or choose calcium chloride plus 5 mg of naphthalene acetic acid, calcium nitrate and 6000 times more liquid.

Each spray is 15 days apart and sprayed 2-3 times in a row. It is worth noting that when using calcium chloride and calcium nitrate, they should not be mixed with sulfur-containing pesticides and phosphates (such as potassium dihydrogen phosphate) to avoid precipitation. [1]

Control temperature and humidity: The soil should be prevented from drying and wet, and the soil should not be excessively dry. When planting, water the seedlings once and irrigate them when the inflorescence blooms and sets fruits, and the amount of water should not be too large. Water later according to soil moisture to keep the soil moist. [1]

Field management: loosen the soil during cultivation, and apply 200 kg of grass ash, which should be applied to the 7-8 cm soil layer to promote soil permeability, water permeability, and enhance plant disease resistance, these simple methods can greatly eliminate the occurrence of umbilical rot. [1]

Chemical control. Generally, at the onset of the disease, 1% superphosphate or calcium chloride is selected for extra-root fertilization, once a week, and the control effect is very obvious. It is important to note that the spray must be in contact with the leaves and fruits, especially the fruits.

Now is the rainy, high temperature, high humidity weather, but also the season planted tomato fruit set expansion period, in case of rainy high temperature and drought, it is very easy to occur this disease. Therefore, when it rains, do a good job of drainage in time, and pay attention to water retention and replenishment after the weather is sunny to prevent umbilical rot from occurring due to large differences. In the growth and young fruit stage of the fruit, if the rotten fruit is found, it should be removed in time, and the young fruit that is not diseased should be sprayed with boron and calcium fertilizer in time, which can reduce the nutrient consumption in the plant and avoid cross-infection, so as to ensure the healthy growth of the fruit.

At the same time, you can also carry out fruit thinning treatment, for the tomato with more flowers and fruits, it is necessary to properly thin some, generally only need to keep 4 to 5 tomatoes that grow well early, so as to reduce the absorption of calcium between the fruits, which is conducive to the remaining fruits to have a good sales sample of neatness. Tomatoes absorb water and nutrients, mostly through the root system. If the fertilizer is applied excessively, the concentration of the soil solution is too high and the root system cannot absorb it.

Because the root system absorbs water and nutrients from the soil by osmotic pressure, the concentration of soil solution is too high, and reverse osmosis will occur, which will cause physiological water shortage.

Therefore, it is necessary to pay attention to watering in the dry season in summer, especially during the flowering and fruit setting period. Of course, watering should pay attention to the temperature control, so as not to cause other diseases. Shading measures can also be done to reduce the transpiration of tomato plants and reduce water loss.

It is best not to supplement calcium fertilizer alone, but to pay attention to the application of boron fertilizer, which can promote the absorption of calcium fertilizer by plants. Within 30 days after the tomato bears fruit, it is a critical period for the fruit to absorb calcium, and 1% superphosphate or calcium chloride can be sprayed on the foliar surface, and a small amount of boron fertilizer can be added to ensure the calcium and boron during this period.

According to the growth and development of tomatoes, formula fertilization technology was adopted, supplemented by foliar spray. For example, in the second half of the month and 45 days a month, calcium fertilizer can be sprayed three times in a row, calcium chloride or 1% superphosphate can be selected, and plant growth regulators such as brassinin can be added. It is best to spray it with the fruit.

The key to the prevention and control of tomato umbilical rot and the solution of calcium deficiency in tomatoes is to promote the activation and utilization of calcium in tomatoes, that is, to increase the transformation of calcium from the root to the leaves, leaves and then to the fruit, and promote the activation and transport of calcium in the plant. Since the umbilicus of the fruit is the weakest part of water transpiration, soft rot occurs here due to calcium deficiency, and calcium transport is mainly carried to the fruit by water transpiration. Therefore, calcium supplementation should be sprayed directly on the fruit to promote calcium utilization.

Nitrogen control can adjust the vegetative growth rate of plants to achieve balanced growth. Reasonable irrigation can ensure the smooth growth environment and nutrient delivery of the root system.

Special chemical fertilizers should be used immediately, because only then can the growth of tomatoes be better guaranteed.

1. The use of plastic film mulching to cover the land where tomatoes are planted can keep the soil moisture and nutrients relatively stable, reduce the loss of water and calcium and boron nutrients in the soil, and prevent the occurrence of umbilical rot. 2. Appropriate amount of timely irrigation, tomatoes need a lot of water when they grow and develop, but the water can not be too little, nor too much, according to the dry humidity of the soil and the growth of the plant, appropriate water. 3. Reasonable fertilization, applying too much nitrogen fertilizer, will lead to excessive plant growth, so that tomatoes can not absorb enough calcium and boron from the soil, resulting in imbalance in the ability to control water, causing umbilical rot, so reasonable fertilization is required.

The direct cause of tomato navel rot is the insufficient supply of calcium during fruit expansion, especially after flowering. Soil dryness, high ground temperature, excessive nitrogen fertilizer and acidic soil can all hinder the absorption of calcium by roots, which can cause the occurrence of this disease. It is also believed that water imbalance is the main cause of the disease.

Especially in drought, due to the lack of water, the water that should be transported to the fruit and the water in the fruit are taken away by the leaves, resulting in a sudden large amount of water loss in the fruit, causing necrosis of the umbilical tissue of the fruit and forming umbilical rot.

Unripe green fruits are susceptible to disease. Generally, there is drought after rain, or there is more irrigation in the early stage, lack of water in the later stage, the root system is stunted, and it is suddenly attacked by dry and hot wind, and the transpiration of the leaves exceeds the water absorption of the roots; Too much nitrogen fertilizer, or acidic soil can contribute to the occurrence of umbilical rot. There were also differences between varieties, and varieties with fruit umbilical apicals that were not easy to fall off and had large flower marks were susceptible to saprophytic fungus saprophytics, which aggravated fruit damage. When the calcium content in the fruit is low, it is prone to disease.

Umbilical rot is a physiological problem, caused by calcium deficiency, and cannot be prevented in advance.

Umbilical rot only harms the umbilicus of the fruit, and the diseased part generally does not rot, has no mold layer (there is also the case of saprophytic bacteria reproduction) and no odor, and other parts are normal.

After fruit set, calcium fertilizer is often sprayed on the foliar surface, which can be mixed with other pesticides, and top dressing should be applied in a balanced manner to reduce the amount of nitrogen fertilizer. Nitrogen fertilizer and calcium fertilizer have antagonistic effect, and if there is more nitrogen fertilizer, the root system will not absorb calcium fertilizer well. Watering fertilizer should be watered frequently with small water, and water supply fertilizer should be balanced.

Tomato navel rot is very common and can occur in both open and protected areas due to a lack of calcium in the plant.

Summary. Hello dear, <>

The cause of tomato navel rot is soil infection: tomato navel rot bacteria can survive and multiply in the soil, and when there is a certain amount of bacteria in the soil, it is easy to infect tomato plants. Especially in the environment of high temperature and high humidity, diseases are more likely to occur.

Seed dispersal: Tomato nabilical rot can be spread by seeds, and if planted with infected seeds, the disease can spread rapidly through the plant. Improper moisture management:

Overwatering or uneven watering can cause the soil to become too moist, making it easy for pathogens to survive and multiply in the soil, triggering diseases. Lack of nutrients: When tomato plants are deficient in nutrients, they will be less resistant and more susceptible to diseases.

What causes tomato navel rot.

Hello dear, <>

The cause of tomato navel rot is soil infection: tomato nabilical rot bacteria can survive and multiply in the soil, and when there is a certain amount of bacteria in the soil, it is easy to infect tomato plants. Especially in the environment of high temperature and high humidity, diseases are more likely to occur.

Seed dispersal: Tomato navel rot can be spread by seeds, and if planted with infected seeds, the disease can spread rapidly in the plant. Improper moisture management:

Overwatering or uneven watering can cause the soil to become too moist, making it easy for pathogens to survive and multiply in the soil, triggering diseases. Lack of nutrients: When tomato plants are deficient in nutrients, they will be less resistant and more susceptible to diseases.

Is there a way to prevent it.

The methods to prevent tomato navel rot mainly include the following aspects: selection of disease-resistant varieties: the selection of disease-resistant varieties is one of the most effective ways to prevent tomato umbilical rot.

Disease-resistant varieties have the characteristics of strong disease resistance and good disease resistance, which can reduce the occurrence of diseases. Grow healthy seeds: Choosing healthy tomato seeds can reduce the occurrence of diseases.

When buying seeds, it is necessary to choose a certified and regular source, and avoid buying seeds infected with pathogens. Proper fertilization: Tomato plants need the right amount of nutrients from spring deficiency to grow healthily, but excessive fertilization can lead to high soil fertility, which can increase the occurrence of diseases.

Therefore, it is necessary to carry out reasonable fertilization according to the needs of the soil and plants. Uniform watering: Overwatering or uneven watering can cause the soil to become too moist, making it easy for pathogens to survive and multiply in the soil, triggering diseases.

Therefore, it is necessary to carry out even and appropriate watering according to the actual situation. Crop rotation: Crop rotation reduces the number of pathogens in the soil, which reduces the occurrence of diseases.

Tomato plants should not be planted on the same land for many years and should be rotated appropriately.