What is the reason for the yellow and black tomato fruit?

What is the reason for the poor color change of tomato fruits? And how should it be managed to make the tomato turn color better?

1. Analysis of the reasons affecting tomato veraison

1. The temperature is too low.

The process of tomato veraison is chlorophyll.

Decomposition, lycopene.

and other processes of cucurbitacin formation. Low temperature is not conducive to the synthesis of lycopene, and when the temperature is lower than 15, carotenoids.

It is inhibited, and below 24, the formation of lycopene is inhibited, which leads to poor coloration.

2. Improper fertilization.

During the coloring period of tomato, if too much nitrogen fertilizer is applied, it will lead to an increase in chlorophyll in tomato, which will delay the decomposition of chlorophyll and inhibit the formation of lycopene and carotene. In addition, in nitrogen deficiency, potassium deficiency.

It will form a yellow-peeled fruit.

Boron deficiency results in the formation of green peel fruits. However, potassium fertilizer should also be applied in moderation to prevent excessive application of a certain element, resulting in elemental antagonism and poor fruit development.

3. Insufficient light.

The coloring of tomatoes has a great relationship with light, if the planting density is too much, it will cause the leaves between the plants to cover each other, so that the fruit does not have enough light, there will be poor coloring, the phenomenon of green shoulder fruit.

2. Comprehensive management measures

Because there are many reasons for poor color change of tomatoes, we need to take comprehensive measures to grasp all aspects of production in order to effectively avoid this situation.

1. Scientific temperature control.

The most suitable temperature for tomato coloring is 18 26, in order to promote the development and coloring of tomato fruits, and prevent the occurrence of uneven coloring of tomato, in the tomato fruiting period, especially in the veraison period, the temperature is generally controlled at 23 28 during the day and 13 18 at night, which is conducive to tomato color and redness. It is worth noting that in the deep winter period, greenhouse tomatoes must strengthen thermal insulation measures.

2. Reasonable fertilization.

During the growing period of tomatoes, especially in the fruiting period, be careful not to apply nitrogen fertilizer; Potassium fertilizer is good for fruit coloring, but the fertilizer effect is slow, so it should be applied before the coloring period. Potassium fertilizer can be applied with water at the beginning of fruiting, boron fertilizer can be supplemented with boron fertilizer in basal fertilizer, or boron fertilizer can be sprayed 3 times from the opening of the first panicle flower to promote uniform coloring of tomatoes.

3. Make up the light.

When there is a lack of light in continuous rainy weather, vegetable farmers can improve the light intensity in the shed by installing fill lights and hanging reflective curtains.

The greenhouse film also needs sufficient light transmittance.

To often wipe the greenhouse film or use dust cloth strips to increase the light transmittance of the greenhouse film, when the planting is too dense, the ventilation and light transmittance is poor, it has a certain impact on the coloring of the middle and lower fruits, and it is necessary to reasonably prune and beat the leaves to ensure that the light can fully shine on the fruit surface.

It is most likely caused by overwatering the plant. It is also possible that there are pests and diseases in the plant, and the plant-specific insecticide should be used in time, evenly sprayed on the plant leaves, and it should not be watered during the medication, otherwise there is no effect.

It may be because you didn't spray it with an insect repellent pesticide, causing it to be bitten by a bug, so it will turn yellow and black.

The yellowing and black of tomato fruit is the tendon rot and umbilical rot of tomato, which is a physiological disease of tomato.

The tendon rot of tomato is a physiological disease in the fruit expansion stage, local browning occurs on the fruit surface, the fruit surface is convex and uneven, the heart of the diseased fruit becomes hard or the flesh turns brown, and the vascular bundle turns brown but does not turn red, losing its commodity value.

1. Tomatoes suffer from late blight: after the onset of the disease, there will be inconspicuous lesions near the fruit stalk, and after a period of time, the range of lesions will slowly expand, and its color will gradually change to black-brown, and there will be a slight invagination in the place with lesions.

2. Tomatoes suffer from browning tendon rot: the disease mainly occurs in the fruit expansion period, the appearance of the fruit is intact at the beginning of the disease, but there will be a dark brown disease under the peel, after a period of time, the color of the disease will become darker, and the disease will look more obvious after becoming deeper, if the fruit is cut, you can also see that the internal vascular bundles have been necrotic, and the flesh has also become dark brown and contains black tendons.

3. Tomatoes suffer from anthrax: at the beginning of the disease, there will be some transparent lesions on the surface of tomatoes, and the lesions will gradually expand, and their color will slowly change to black and brown, and after a period of time, the diseased part will be slightly dented, and at the same time, many small black spots will be born in the diseased part (and secrete reddish mucus), and finally the whole tomato will begin to rot black and fall.

4. Tomatoes suffer from umbilical rot: the disease is easy to occur in high temperature weather, dry weather, lack of water and calcium deficiency after fruit setting, etc., after the disease, the pedicle of the fruit will appear water-stained lesions, and the lesions will gradually expand and become black-brown, and finally the pedicle of the fruit will begin to appear sunken.

Tomato bottom blackening prevention and control method.

1. Prevention and control of late blight: Generally, 40% ethylphosphine aluminum wettable powder (200 times liquid) or 25% Ruifumyces wettable powder (800 times liquid) and other drugs can be sprayed at the early stage of the disease, such as 400 times liquid, sprayed once every 7 days, and sprayed 3-4 times.

2. Prevention and control of browning tendon rot: Generally, 40% plant virus spirit soluble powder (1000 times liquid) and other drugs can be sprayed, sprayed once every 7-10 days, and sprayed 3-4 times in a row.

3. Prevention and control of anthracnose: Generally, 50 carbendazim wettable powder (500 times liquid) or 75 chlorothalonil wettable powder (600 times liquid) methyl tobuzine wettable powder (600 times liquid) and other drugs can be sprayed once every 7 days, and 2-3 times can be sprayed.

4. Prevention and control of umbilical rot: Generally, you can spray Green Fenwei No. 3 (1000-1500 times liquid) and other drugs at the early flowering stage, spray 1 time every 10-15 days, and spray 2-3 times in a row.

1.If the bottom of the tomato is blackened, it is likely to be infected with tomato navel rot, which generally appears in the early stage of fruit development, and there will be water-stained lesions on the umbilicus of the fruit, which will harm most of the fruit in severe cases.

2.If the air humidity is relatively high, various molds will appear on the lesions.

3.If it is dry, the lesion will also appear dry leathery, and it is necessary to remove the diseased fruit in time and spray the drug for **.

This is a physiological disease caused by a lack of calcium. In general, there is no lack of calcium in the soil, but it is caused by the uncoordinated absorption of calcium by plants and their growth. The absorption of calcium by plant roots cannot keep up with the needs of plant growth, resulting in calcium deficiency. <

This is a physiological disease caused by a lack of calcium. In general, there is no lack of calcium in the soil, but it is caused by the uncoordinated absorption of calcium by plants and their growth. The absorption of calcium by plant roots cannot keep up with the needs of plant growth, resulting in calcium deficiency.

Treatment: Spray 300-500 times of calcium chloride solution three times in a row, with an interval of 3-5 days.

If the tomato is deficient in calcium, do not use too much nitrogen, so as not to prevent the absorption of calcium. Once calcium deficiency occurs, the fruit is not easy to recover, so it is generally advisable to pick it early so as not to affect the yield in the later stage.

Summary. This should be tomato navel rot.

Tomato navel rot, also known as pedicle rot, is one of the common diseases on tomatoes. Both protected and open land occur, but protected land is heavier than open land. The sandy soil areas and drought years along the coast (river) are seriously harmed.

Severe disease often causes black spots and rot of fruits, which directly affects yield and quality.

1. Symptoms. The disease generally occurs when the fruit grows to the size of a walnut. Initially, water-soaked lesions appeared on the umbilicus, and then gradually expanded, causing the top of the fruit to become sunken and brown. The lesions are usually 1-2 cm in diameter and extend to half a fruit in severe cases.

When drying, the diseased part is leathery, and when it encounters damp conditions, various mold layers grow on the surface, often white, pink and black. These layers are saprophytic fungi and not pathogens of the disease. The diseased fruits mostly occur on the first panicle fruits, and these fruits tend to be small, hard, and turn red early.

Agricultural) tomato fruit bottom, rotten and black, like ripe appearance is what is the problem.

This should be tomato navel rot. Tomato navel rot, also known as pedicle rot, is one of the common diseases on tomatoes. Both protected and open land occur, but protected land is heavier than open land.

The sandy soil areas and drought years along the coast (river) are seriously harmed. Severe disease often causes black spots and rot of fruits, which directly affects yield and quality. 1. SymptomsThe disease generally occurs when the fruit grows to the size of a walnut.

Initially, water-soaked lesions appeared on the umbilicus, and then gradually expanded, causing the top of the fruit to become sunken and brown. The lesions are usually 1-2 cm in diameter and extend to half a fruit in severe cases. When drying, the diseased part is leathery, and when it encounters damp conditions, various mold layers grow on the surface, often white, pink and black. These layers are saprophytic fungi and not pathogens of the disease.

The diseased fruits mostly occur on the first panicle fruits, and these fruits tend to be small, hard, and turn red early.

Why do tomatoes rot inside when they are ripe?

Why do tomatoes rot inside when they are ripe?

That's it.

Calcium deficiency. Physiological diseases caused by calcium deficiency. Calcium can be supplemented by foliar sprays of high-purity calcium or medium and trace element fertilizers containing alginic acid or fish protein in combination with roots.

Is it just a direct spray.

That's right. Ask a custom message

Summary. Hello dear, happy to answer your <>

The yellowing of the bottom of the tomato fruit is usually caused by a calcium deficiency, a phenomenon known as "calcium heart disease". Here are some of the things you can do:1

Provide adequate water: Keep the soil moist but not overwatered to avoid root rot. 2.

Application of calcium fertilizer: The use of fertilizers containing calcium, such as lime or well-rotted animal fertilizers, can replenish the calcium in the soil. 3.

Control soil pH: Keep the pH of the soil within the appropriate range, and the pH value should be between. 4.

Increase organic matter content: Adding organic fertilizers, such as well-rotted compost or humus, can improve soil structure and provide the nutrients that plants need. 5.

Avoid over-fertilization: Over-fertilization can lead to poor plant absorption, and it is recommended to fertilize according to the instructions on the fertilizer package.

How to deal with the yellowing of the bottom of the tomato fruit.

Hello dear, Ziyuan is happy to answer your <>

The yellowing of the bottom of the tomato fruit is usually caused by a calcium deficiency, a phenomenon known as "calcium heart disease". Here are some of the best things to do:1

Provide adequate water: Keep the soil moist but not overwatered to avoid root rot. 2.

Application of calcium fertilizer: The use of fertilizers containing calcium, such as lime or well-rotted animal fertilizers, can replenish the calcium in the soil. 3.

Control soil pH: Keep the pH of the soil within the appropriate range, and the pH value should be between. 4.

Increase organic matter content: Adding organic fertilizers, such as well-rotted compost or humus, can improve soil structure and provide the nutrients needed by plants. 5.

Avoid over-fertilization: Over-fertilization can lead to poor plant absorption, and it is recommended to fertilize according to the instructions on the fertilizer package.

Please note that it takes some time to deal with calcium, so you need to be patient. At the same time, the affected tomato fruits should be picked in time to prevent the disease from collapsing and spreading.

Use that package of fertilizer to send a **.

Dear, we can't send pictures or receive ** here.

How about it is recommended to use fertilizer.

For dealing with the problem of yellowing at the bottom of the tomato fruit, you can use a fertilizer containing calcium to supplement the calcium element in the soil. Here are some commonly used fertilizer options:1

Lime: Lime is a common calcium fertilizer per acre, which can improve the pH of the soil and provide the calcium required by plants. Based on the soil test results, apply according to the instructions on the package.

2.Well-rotted animal fertilizers: Well-rotted animal fertilizers, such as well-rotted chicken or cow manure, are rich in organic matter and calcium, which can improve soil structure and provide the nutrients needed by plants.

3.Eggshell powder: Eggshells are a natural source of calcium that can be dried and ground into a powder that is then sprinkled on the surface of the soil.

Eggshell powder can be gradually decomposed, releasing calcium for plants to absorb. 4.Calcium fertilizer:

There are also specialized calcium fertilizers available on the market that can be used according to the instructions on the package. Regardless of the type of fertilizer chosen, it should be applied based on the results of soil tests and the plant's needs. Please note that over-fertilization may cause harm to plants, so follow the recommendations on the fertilizer package.

This is a symptom of the onset of tomato gray mold. Remove the sick and disabled bodies in a timely manner, clean them out of the park, and concentrate on high-temperature piles or deep burials to avoid transmission. The greenhouse is covered with plastic film to avoid flood irrigation, and ventilation and cooling are carried out in time after watering.

Ventilation management is strengthened and humidity is reduced. Watering should be in the morning on a sunny day, and watering should be properly controlled at the beginning of the disease.

Botrytis botrytis mainly affects tomato fruits, leaves and stems. Fruit damage generally starts from the residual petals, receptacles, etc., and appears moist, gray-brown or black amorphous lesions, and gradually develops into wet rot, developing from the sepals to the periphery, which can make more than 1 3 fruits rot, and the disease grows a layer of hairy mold.

Leaf infection mostly starts from the tip or edge of the leaf, and amorphous moist and gray-brown lesions occur, which can cause wet rot and withering of leaves. Stem infection produces oblong or amorphous strip-shaped, gray-brown lesions, and gray mold layer also grows when wet, which can cause the death of stems and leaves above the lesions.