What is the reason for the black color of the pepper trail?

Hello, the blackening of the pepper stalk can be caused by the following reasons:

1. Bacterial soft rot.

The germs invade from the wound and the xylem is exposed because of the fertilizer on the surface of the shoot.

The xylem is inconvenient in color, and when the lesion develops and expands or goes around the stem, it will emit a fishy odor, and it will also cause the fruit to be infected and soft rot.

Control method: Crop rotation with leguminous vegetables or rice, free from Solanaceae or Cruciferaceae.

Crop rotation, at the same time strengthen field management, reasonable dense planting, drainage after rain, strengthen permeability, timely removal of diseased fruits and diseased plants out of the field and burn. Before and after the rain of the fruit, spray the pesticide in time to prevent and control.

2. Epidemic diseases. The onset of the epidemic is acute. Rapid development, mostly in the main stem and main stem of the "node" part, the lesion is dark brown or black-brown, the cortex is not soft rot, the xylem becomes dark brown, the lesion begins not to be sunken, can produce sparse white mold, but it is relatively rare in a dry environment.

Prevention and control methods: the same should implement crop rotation, reasonable dense planting, strengthen fertilizer and water management, increase the application of organic fertilizer or ribery water-soluble fertilizer, water-soluble fertilizer dissolves quickly, the utilization rate is high, and the use effect of pesticides is good. After the diseased strains are found, the smoke method can be used in the protected area, and 45 chlorothalonil can be applied per mu.

Smoke, 200-250 grams per mu, preventive or fumigation. The dust method is used, or 5 chlorothalonil dust agent is sprayed with 1 kg per mu.

3. Sclerotinia sclerotinia generally occurs at the branch fork, which begins as a gray-white soft rot symptom, and then gradually grows a white mold layer, and then gathers to produce rat fecal-like sclerotia, and the xylem under the lesion is rotten and dry, and it can also infect fruits and leaves and make them rot.

Prevention and control methods: deep ploughing of the soil, so that the sclerotia can not, germination, remove the sclerotia of the seeds, avoid its mixing, drain and reduce moisture, remove diseased leaves, fruits and diseased plants, and bury or burn them in time.

4. Botrytis cinerea.

This disease is mostly caused by the residual peanut mold falling on the stem, and some are due to the dripping water of the old gray mold lesions and infecting the stem, invading from the fruit stalk, causing the stem to rot, the lesions are light brown, not concave, with gray dense mold, around the stem after a week.

The upper part is dry. Prevention and control methods: high furrow cultivation should be used, and covered with plastic film to increase the ground temperature, reduce humidity, do a good job in the temperature and humidity control of the shed, keep the high temperature in the morning, extend the ventilation time in the afternoon, increase the ventilation volume, and appropriately increase the temperature at night to reduce foliar condensation.

After the onset of the disease, the diseased fruits, diseased leaves and side branches should be removed in time, burned or buried in time, and then sprayed with pesticides for prevention and control.

Hello, it may be pepper blight, the main symptoms: the base of the infected seedling stem is soaked in water and soft rot, causing the upper part to lodging, mostly dark green, and finally sudden or withered death; After planting, the leaves are infected with disease, resulting in dark green lesions, and the leaves are soft rot and fall off. Stem infection also produces dark green lesions, causing soft rot or inverted stem branches, and white mold can be seen in the diseased area when the humidity is high.

It is best to apply organic fertilizer to pepper, and at the same time to apply enough potassium fertilizer and calcium fertilizer, it is recommended to use high potassium water-soluble fertilizer and chelated calcium fertilizer.

What is the reason why my peppers turn black during growth?

Hello, blackening at the pepper branches may be bacterial soft rot. Prevention and control methods: strengthen field management, reasonable dense planting, drainage after rain, strengthen permeability, timely remove diseased fruits and plants out of the field and burn.

Before and after the rain, spray pesticides in time to prevent and control them, and agricultural streptomycin can be used or can be killed three thousand alternately.

Summary. The blackening of pepper leaves is due to the fact that the root absorption of pepper is blocked, resulting in nutrients and water that cannot be absorbed by the aboveground part of the pepper, resulting in the phenomenon of blackening of pepper seedling leaves and falling leaves.

The blackening of pepper leaves is due to the fact that the root absorption of pepper is blocked, resulting in nutrients and water that cannot be absorbed by the aboveground part of the pepper, resulting in the phenomenon of blackening of pepper seedling leaves and falling leaves.

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What to do.

The solution is: you can use water-soluble fertilizer of nitrogen, phosphorus and potassium (content, 20-20-20) and humic acid active liquid fertilizer for root flushing, and use it continuously for about 2 times, with an interval of about 10 days.

The reason for the blackening of pepper shoots is that they are infected with soft rot, and the shoots will rot and need to be sprayed with an agricultural streptomycin solution. In the case of epidemic disease, water and fertilizer management can be strengthened, and chlorothalonil tobacco solution can be sprayed. Sclerotinia sclerotinia can be turned over and sprayed with Pythium solution.

In the case of gray mold, you can cover the soil surface with a thin film and spray Pythium solution to prevent it.

1. Soft rot.

If a wound infection occurs in a pepper, it can cause bacteria to grow and suffer from soft rot. The branches of peppers are blackened, and if not treated in time, they will cause the branches and fruits to rot. The planting density of peppers was controlled, air circulation was enhanced, and the damaged branches were removed, and agricultural streptomycin solution was sprayed for control.

2. Blight The blight disease occurs rapidly and will erode the pepper branches, mostly in the branches and rhizomes of the pepper, causing black-brown spots on the surface of the branches and white mold. In the growth process of peppers, water and fertilizer management is strengthened, and organic fertilizers can be applied. Spray the diluted chlorothalonil tobacco solution on the damaged part of the pepper for prevention and control.

3. Sclerotinia sclerotiorum.

Sclerotinia sclerotinia generally occurs at the intersection of pepper branches, and white rot appears, gradually turning into a white mold layer, resulting in rot of the branch and fruit. The soil of the peppers needs to be turned over to kill the bacteria in the soil and the decay will be pruned with branches and leaves. According to the frequency of 1 time in 7 days, spray the Pythium solution, and spray it continuously.

4. Botrytis cinerea.

Botrytis is caused by bacteria dripping on the stem of the pepper branch through rainwater, causing the branches to appear black-brown spots, which gradually dry up and rot, causing the death of the fruit. It is necessary to cover the soil surface with a thin film to increase the surface temperature. It is maintained in a ventilated place to enhance air circulation, and can be sprayed with Pythium solution for prevention and control.

Summary. Pepper black spot disease mainly infects fruits, and the lesions on the surface of the fruit are light brown, oval or irregularly shaped, slightly concave, with a diameter of 10 20 mm or even larger, and a dense black mold layer in the later stage. When the disease is severe, there are several lesions on a fruit, or the lesions heal into larger lesions, and the black mold layer is densely formed on them.

Two**. The pathogen overwinters in the soil with the mycelium and the diseased residue, and when the conditions are suitable, it damages the fruit and causes the disease. The diseased department produces conidia that are spread by wind and rain and re-infected.

Most of the germs invade from wounds, and the wounds formed by the fruit burned by sunlight are easy to be used by the germs and become the main invasion site. The pathogen likes high temperature and high humidity conditions, and the temperature is 23 26 and the relative humidity is above 80.

Ask the teachers: What is the problem of black on the surface of chili peppers? What kind of medicine is used?

Hello, I have seen your question and am sorting out the answer, please wait for a while Pepper black spot disease mainly infects the fruit, and the lesions on the surface of the fruit are light brown in the early stage of the disease, oval or irregularly shaped, slightly concave, with a diameter of 10 20 mm or even larger, and a dense black mold layer in the later stage. When the disease is severe, there are several lesions on a fruit, or the lesions heal into larger lesions, and the black mold layer is densely formed on them. Second, the first bacterium overwinters in the soil with the mycelium with the diseased residue, and the disease is caused by the harmful fruit when the conditions are suitable.

The diseased department produces conidia that are spread by wind and rain and re-infected. Most of the germs invade from wounds, and the wounds formed by the fruit burned by sunlight are easy to be used by the germs and become the main invasion site. The pathogen likes high temperature and high humidity conditions, and the temperature is 23 26 Yu Zhizhi, which is more than 80 in the humidity of Hail and Hail.

The black spots on the pepper fruit are mainly pepper black spot anthracnose, and the fruit lesion is similar to anthracnose, but the small black spots on the diseased part are larger and darker in color. When the humidity is high, the small black dots can overflow with orange-red slime.

Prevention methods: 1. Establish disease-free variety fields or leave seeds from disease-free plants. Soak the seeds in 55 warm water for 30 minutes. It can also be soaked in cold water for 5 to 15 hours, then soaked in 1% copper sulfate solution for 5 minutes, taken out and added an appropriate amount of slaked lime or plant ash to mix seeds, and sown immediately;

2. Use nutrient bowl to raise seedlings to prevent root injury and germ invasion. Crop rotation with melon vegetables and leguminous vegetables for more than 2 to 3 years; And choose sandy loam soil with good drainage and irrigation, and cultivate plots without wind. When pulling seedlings, the bottom should be removed to remove the diseased residues in the field;

3. Strengthen field management and avoid over-dense planting; Adopt formula fertilization technology to avoid colonization in lower wetlands; In the rainy season, pay attention to ditching and drainage, and prevent sunburn of fruits.

There are black-brown oblong lesions on the pedicles, the middle part is grayish-white, concave, and slightly cracked, and the small black spots scattered on the lesions are most consistent with the symptoms of anthrax.

Although anthrax mainly damages fruits, it can also infect leaves and fruit stalks.

About pepper anthracnose.

The pathogen is a fungus of the genus Anthracnose, which likes a high humidity environment, and can be transmitted by seeds carrying bacteria, diseased residues, wind and rain splashing, insects or drenched water.

Low-lying terrain, heavy soil, poor drainage, over-dense planting, poor permeability, insufficient fertilization or excessive nitrogen fertilizer, extensive management caused surface wounds, or leaf spot disease, fruit exposure to the scorching sun, etc., are easy to induce the infection and epidemic of the disease.

Comprehensive prevention and control of pepper anthracnose.

1. Apply enough high-quality base fertilizer, avoid continuous cropping, choose sterile seeds, pesticide seed dressing, and turn over the soil before sowing after harvest to reduce the occurrence of the disease.

2. Planting in high furrows and deep furrows, reasonable dense planting, increasing phosphorus and potassium fertilizers, and drenching Trimgen Biduo to cultivate good plant potential and improve disease resistance.

3. Reduce fruit wounds (such as preventing stinging and sucking pests), drain water in time after rain, and harvest in time. In the early stage of the disease, benzoazrobin, difenoconazole, methioprodion, mixian carbendazim and other sprays can be used to prevent and control the disease.