What causes blackening on tomato pedicles?

The blackening of the tomato pedicle can be caused by a number of reasons.

One possibility is due to a calcium deficiency, and the symptoms on the fruit usually turn black at the top of the fruit, while the flesh also softens. This can be alleviated by applying calcium fertilizer or spraying calcium fertilizer.

Another possibility is pedicle rot, a disease commonly found on tomato and green pepper fruits. At the onset of the disease, the top of the fruit (i.e., the pedicle) turns black, often affecting the size and quality of the fruit. This disease is usually prone to occur in high-temperature, high-humidity, and non-breathable environments, and can be prevented by improving crop management, such as increasing ventilation and light transmission, and using appropriate fungicides.

It can also be due to a lack of calcium in soil or soilless culture, or due to factors such as a temporary lack of water supply, excessive salinity, competition for other elements in the soil or substrate, sudden low humidity and hot winds, and undeveloped crop roots.

If the situation is frequent and severe, it is advisable to consult a professional or contact the relevant agricultural department for further diagnosis and ** advice.

Tomato gray mold is mainly caused by low temperature and high humidity, extensive management, insufficient application of phosphorus and potassium fertilizer, mechanical injury, insect injury, low-lying terrain, long branches, canopy, insufficient ventilation and light transmission.

It is recommended to apply reasonable fertilization, increase phosphorus and potassium fertilizers, and use pyrimycoamine or pythium or azoxycyclamine or fludioxonil or iprodione plus azoxystrobin plus mesomycin.

or agricultural streptomycin or phyllophyllum or chunleimycin.

Carry out prevention and control.

The blackening of the pedicle of the tomato is caused by illness.

If you have leaf mold, you need to buy some related drugs to spray, and you can see the effect in a week.

When the early blight of tomato is manifested on the fruit, the green fruit is mostly in the calyx or umbilicus, forming a black-brown nearly circular depression lesion, and in the later stage, it occurs from the crack of the fruit pedicle or the fruit stalk, and forms a round or oval dark brown lesion near the fruit pedicle, the lesion is depressed, there are concentric ring lines, the spot surface will have a black mold layer, the diseased fruit is easy to crack, and it turns red early, with azoxystrobin, difenoconazole, oxazole. Manganese, zinc, etc., add water spray.

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Fruit cracking caused by boron deficiency. It is recommended to pay attention to even watering to prevent drought from inducing rational boron deficiency. Spray sugar alcohol boron or rush to apply solubor.

Caused by boron deficiency, foliar sprays of bihu and solubor chelate calcium. Timely supplementation of boron-calcium fertilizer caused by boron-calcium deficiency. There are several reasons for the splitting of the fruit:

Water imbalance, hot and dry weather or after a long drought, sudden rain, when the moisture is sufficient, ,......Nutritional imbalance, excessive amount of nitrogen fertilizer, and insufficient calcium, potassium and boron can easily lead to fragile pericarp cells, poor development of pericarp and cracking of fruits. Therefore, it is necessary to pay more attention to soil moisture, reduce the use of high-nitrogen fertilizers, and supplement medium and trace elements such as calcium, magnesium, boron, zinc, etc., which can be flushed with micro-root supplementation.

Summary. Hello dear

Stem base rot Tomatoes are easy to cause stem base rot in the early stage of planting, which will harm the stem base of the plant or the underground main side roots after the disease, and the cortex of the diseased part is easy to peel off, and the roots and root positions will appear black and rotten. Phytophthora root rot Tomatoes at the adult stage are susceptible to Phytophthora root rot, the main site of disease is in the root system, rhizome, after the plant is easy to be uprooted, longitudinal section of the stem base of the tomato will find that the vascular bundle turns black.

Hello pro stem base rot Tomatoes are easy to cause stem base rot in the early stage of planting, and after the onset of the disease, it will harm the stem base or underground main side roots of the plant quietly, and the cortex of the affected part is easy to peel off, and the root and root position will appear black and rotten. Phytophthora root rot Tomatoes at the adult stage are susceptible to Phytophthora root rot, the main disease site is in the root system, rhizome, the plant after the onset of bent finch disease is easy to be uprooted, longitudinal section of the stem base of the tomato will find that the vascular bundle turns black.

The base is blackened, which may be infected with stem base rot and Phytophthora root rot, and the stem base rot is irrigated with 1200 times of 20% methyl liquin phosphate emulsifiable concentrate, 95% of 3000 times of Phytophthora root rot, and 80% of Phytophthora root rot is used to irrigate the roots. If the stalk or branch is black, it may be that Shiyoushi is infected with early blight, late blight, stem blight, and stripe virus disease, and it is necessary to distinguish the corresponding spraying**.

This condition is what the disease is.

Stem base rot. For stem base rot, 1200 times of 20% methyl phosphate emulsifiable concentrate, 3000 times of 95% oxafen 3000 times of metallin were used to irrigate the roots, and 800 times of Phytophthora root rot were used to irrigate the roots. If it is a black burrower at the stalk or branch, it may be infected with early blight, late blight, stem blight, and stripe virus disease, and it is necessary to distinguish the corresponding spraying**.

If it's an early blight, how to **.

<> pesticide control: can be sprayed with mancozeb, kill bitoxin, chlorothalonil, methalene manganese zinc. Mancozeb or chlorothalonil can also be used to apply the diseased part of the stem after the onset of the disease. If the base of the stem is covered with black-brown lesions, permanganic acid can be used to irrigate the roots with potassium.

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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.

What is the disease when the tomato roots turn black and the leaves wilt.

Pro, which causes yellowing and wilting of plant leaves is the cause of root rot. The cause of yellowing and orange wilting of the leaves of the plant and the rotting and blackening of the tomato root system is that the tomato plant has a disease. There are many reasons for the occurrence of stiff fruits, mainly lack of fertilizer, weak light, pests and diseases, etc.

The cause of yellowing and wilting of tomato leaves and root rot and blackening is root rot, which can be controlled by spraying sodium disulfonate on the roots. The yellowing of the leaves of the plant is caused by root rot. Causes the leaves of the plant to wilt yellow, the cause is disease.

The blackening of the leaves of tomatoes may be caused by black spot infection. Black spot disease mostly occurs between May and June, and it is easy to get infected in a high temperature and humidity environment, which will cause the leaves to turn black, dry out, and even wilt, and the fruit will rot. If the disease is severe, it will affect the yield.

The diseased strains should be isolated as soon as possible, and sterilization and disinfection agents should be sprayed.

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What medicine is good to use?

There are many pesticides that can be used for black spot disease, generally using 4% flusilazole 800 1000 times solution, 75% chlorothalonil 500 times solution, 20% silazole prochloraz 800 1000 times solution, 80% zebsen 500 times solution, spray 1 time in 7 10 days, spray 3 4 times.

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.

Tomato bacterial spotted disease is also known as bacterial leaf spot.

It mainly harms leaves, stems, flowers, petioles, and fruits. The leaves are susceptible to the disease, producing dark brown to black irregular spots, 2-4 cm in diameter, with or without yellow halos around the spots. The petioles and stems have similar symptoms, producing black spots but no yellow halos around the lesions.

The lesions are easy to connect into plaques, and in severe cases, a section of the stalk can turn black. The flower buds are damaged, and many black spots are formed on the sepals, and when they are connected, the sepals dry up and cannot bloom normally. The small spots at the beginning of the young fruit are slightly raised, and the green color around the lesions tends to remain green for a long time when the fruit is nearing ripeness.

The flesh near the lesion is depressed, black around the lesion, and the middle is light in color and slightly depressed.

Tomato bacterial spotted disease, the pathogen is the tomato lesion caused by Pseudomonas syringae. The pathogen can overwinter on tomato plants, seeds, diseased residues, soil and weeds, and can survive for up to 20 years on dried seeds, where it can spread over long distances. Sowing infected seeds, seedlings can become diseased, and seedlings can be transmitted to the field after the disease, and spread through rainwater, insects, and agricultural operations, resulting in epidemics; As long as 10% of the plants are initially diseased in the field, it can spread to the whole plot, and the conditions of temperature below 25 and relative humidity above 80% are conducive to the occurrence of disease.

In the early stage of the disease, 400-500 times of 77% wettable powder, or 600 times of 2000 dry suspension, or 500 times of 20% thiophanate, or 300 times of 14% copper ammonia aqueous solution, or copper hydroxide solution, spray 1 time every 10 days or so, and spray 3-4 times in a row.

That's because the water has been poured too much, and the roots are rotten.

When there is too much rain, the cause of root rot in crops is the lack of oxygen in the soil, and the roots carry out anaerobic respiration to produce alcohol, which has a toxic effect on root cells, which is called root rot.

Tomato tendon rot is generally not visible on the stems and leaves, but when the stem is cut 70 cm away from the root, it can be seen that the conductive tissue of the stem is brown and has been destroyed, resulting in the above symptoms in the fruit, which is different from the virus disease.

**]: Since it is a physiological disease, the degree of damage depends on the variety (Wanda is less susceptible to infection), the number of hours of sunshine, the intensity of light, and the proportion of nitrogen, phosphorus and potassium in the soil.

Prevention and control methods]: mainly in the management of efforts, appropriate increase of light to scientifically determine the sowing, planting period, the use of formula fertilization. Those who have the above symptoms can spray multi-element fertilizer.

1) Physical control.

High-temperature disinfection of the earth: Carried out during the high temperature of the three summers. After pulling seedlings in the spring protected land, the field should be cleaned first, and the diseased plants, diseased leaves, and diseased roots should be eliminated from the field and buried or burned; 50 100 kg of lime and 1000 kg of crushed straw (or wheat straw) per mu can be used to control cucumber wilt, blight, root-knot nematodes, etc.

Baking soda or high-fat film to prevent powdery mildew: when powdery mildew just occurs, spray baking soda 500 times, once every 3 days, spray 5 or 6 times, not only to prevent powdery mildew, but also to decompose carbon dioxide and improve cucumber yield. Or use 80 100 times of 27% high-fat emulsion, spray 1 time in 6 days, and spray 4 times in a row.

3) Yellow plate to attract aphids or silver gray film to avoid aphids.

2) Biological control.

Disease prevention: for powdery mildew, anthracnose, black spot disease, when individual spots appear, you can spray 2% agricultural resistance 120 or agricultural resistance B0-10 water agent 200 times liquid, spray 1 time every 6 7 days, spray 4 5 times, can also treat gray mold, downy mildew. Bacterial diseases, such as horn spot disease in the early stage, can be sprayed with 100 times of agricultural anti-751 water agent, sprayed once every 5 6 days, and sprayed 2 3 times in a row.

Insect control: When cucumber aphids occur, you can spray 200 times of Shaoguanmycin, add neutral laundry detergent, or spray with 200 ml of anisin, plus 60-80 kg of water. Tea yellow mite can be sprayed with 20% compound lepromycin 800-1000 times, sprayed once every 6-7 days, and sprayed 2-3 times in a row.

3) Pharmaceutical prevention and control.

For the diseased tomato in the protected area, pesticides with high efficiency and low nutrient residues can be used for appropriate control. 60% Baitai or 80% Dasheng M-45 wettable powder or 72% Kelu wettable powder can be used for late blight; Scab can be used to prevent black mold dust or 40% Fuxing EC; 8% gram of carboxyl dust or 80% anthrax formeum wettable powder for anthrax; Aphids and whiteflies can be controlled with anti-aphid and anti-lice dust or 10% imidacloprid wettable powder.