What are the symptoms of pepper black spot disease? What are the prevention and control measures?

Small spots appear at first, then slowly expand to a yellowish-brown color. As the symptoms worsen, the spots become denser and denser, slowly forming a black haze layer. Timely disinfection, strengthening water and fertilizer management, and preventing stagnant water can effectively prevent the appearance of black spot disease.

There will be small light brown spots on the surface, irregular shape, there will be some dense black spots, which may form a black mold layer, and if not prevented in time, it will eventually dry up; It is necessary to water frequently, to prevent pests and diseases, to fertilize, to strengthen field management, and to spray pesticides regularly.

The symptom is that the pepper will have a lot of black spots, and the prevention and control measures are to dig out some black parts directly, and then apply phosphate fertilizer, try not to let the pepper blow frequently, often contact the sun, and not too much fertilizer.

The symptom is that there will be some irregular lesions on the fruit, its color is light brown, slightly sunken, there will be a series of fading spots in the initial infection, and in severe cases, a black coal seam will be formed, which will cause the whole branch to dry up; It is necessary to implement the rotation of 2 or 3 years as much as possible, and to choose flat land, as far as possible to use deep ditch planting methods, after the rain must be timely drainage, to prevent large areas of water, but also to do a good job of seed disinfection, strengthen the relevant water and fertilizer management, but also to spray some pests and diseases.

It usually causes the peppers to be particularly yellow, and the leaves will fall off. Can't grow peppers. Generally, it is disinfected with some carbendazim or potassium permanganate. Water more.

Pepper brown spot disease is a bacterial disease, the pathogen is bacteria, open field cultivation greenhouse planting often occurs, the key damage to the fruit, harm the overall production. Let's share with you what the harmful symptoms of pepper black spot are and what are the prevention and control measures.

Generally, there is 1 serious lesion on the fruit, with a pore size of 10 20mm. It is dominated by damaged fruits, and produces small spots of fading at the beginning of infection, which slowly turn light brown or tan with expansion, with irregular appearance and a slight indentation in the middle. When it is wet and cold, the disease part is scattered with dense black spots, and when it is more serious, it becomes a gray-black mold layer.

In the case of expansion, the lesion often heals into a solid and atrophic spot, making the diseased fruit wither.

The key is to survive the winter in a sick body. Its production is related to sunburn, and it is mostly produced in sunburn, that is, the second parasite. The scattering of small raindrops and precipitation can promote the generation of diseases, and the pathogens are left in the cultivation site for winter after the pepper is obtained, becoming the source of infection in the second year.

The pathogen overwinters in the soil with the mycelium residue, and when the standard is suitable, it causes disease for the harmful fruit. The diseased department causes the conidia to be dispersed by wind and rain, and re-infection is carried out. Most of the germs invade by wounds, and the wounds established by the fruit being burned by sunlight are easy to be used by the germs and become a key invasion site.

The germ likes to continue high temperature, high and low temperature standards, the temperature is 23 26, and the air humidity is above 80%, which is beneficial to the disease.

1.When planting green peppers, ridges were used as double sparse plants to improve the leaf area index index.

2.Enhance fertilizer and water management methods: especially in the fruiting period, it should be watered immediately and evenly, always keep the road surface moist, increase phosphorus and potassium fertilizer, promote the growth and development of fruits, and alleviate diseases.

Cultivation with agricultural mulch: The use of agricultural mulch cultivation can improve the growth and development of plant roots, improve resistance, and help to prevent the spread of diseases.

3.Early prevention of diseases: avoid early leaf litter caused by charcoal maggots, viral diseases, scabs, budworms and mites.

4.To carry out mulching cultivation, the relative density of cultivation should be suitable. Improve fertilizer and water management to promote the healthy growth and development of plants.

5.Prevent other diseases, reduce the cause of daily burning, and avoid the infection of brown spot pathogens. The diseased fruit should be removed in time. After obtaining, the diseased residues in the field are completely eliminated and the soil layer is subsoiled.

6.Drug prophylaxis: Remove the fruit immediately and spray the following drugs for prophylaxis.

It can be used with wettable powder or potion, etc. Spray once every 7 or 8 days, and determine the frequency of spraying according to the condition. It can also be used with 45% mancozeb smoke, 1 mu 200 250 grams, alternately applied according to the condition of the disease.

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.

Pepper black spot disease.

In the early stage of pepper black spot disease, irregularly shaped lesions appear on the fruit, light brown, slightly concave.

Harmful symptoms. Generally, the fruit has 1 large lesion with a diameter of 10 to 20 mm. It mainly invades the fruit, forming small spots of fading color at the initial infestation, and gradually turning light brown or yellowish brown with expansion, irregular shape, and slightly concave in the middle. When wet, the diseased area is scattered with dense small black spots, and in severe cases, it becomes a black mold layer.

In the process of propagation, the lesions often heal into large necrotic spots, which dry up the diseased fruits.

Causes and laws.

It overwinters mainly on sick and crippled bodies. Its occurrence is linked to sunburn, which mostly occurs in sunburn, that is, the second parasite. Raindrops scattering and rainwater splashing on rainy days can promote the occurrence of diseases, and the pathogens remain in the cultivation site for overwintering with the diseased residues after the pepper is harvested, becoming the source of infection in the following year.

Pattern of onset. 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 pathogens invade from wounds, and the wounds formed by the fruit burned by sunlight are the most easily used by the germs and become the main invasion site.

The pathogen likes high temperature and high humidity conditions, the temperature is 23 26, and the relative humidity is more than 80% The conditions are conducive to the onset of disease.

Prevention and control methods. 1) Agricultural control.

When planting bell peppers, ridges were used to plant double trees densely to increase the leaf area coefficient.

Strengthen water and fertilizer management: especially in the flowering and fruiting period, it should be watered in a timely and uniform manner, keep the ground moist, increase phosphorus and potassium fertilizers, promote fruit development, and reduce diseases. Take mulch for cultivation:

Mulching can promote the development of plant roots, enhance resistance, and help prevent the spread of diseases.

Timely control of pests and diseases: prevent early defoliation caused by anthracnose, virus diseases, scabs, aphids and mites.

Carry out mulching cultivation, and the cultivation density should be appropriate. Strengthen fertilizer and water management to promote the healthy growth of plants.

Control other pests and diseases, reduce the production of daily burnt fruit, and prevent the infection of black spot pathogens. The diseased fruit should be removed in time. After harvesting, the field is thoroughly removed from the field and the soil is turned deeply.

2) Pharmaceutical prevention and control: Remove the diseased fruit in time, and spray the following pesticides for prevention and control.

Prevention: (Quick Clean) 30-50ml + (Wofeng) 25ml + 15ml of garlic oil mixed with 30 kg of water, spray regularly. **：

Quick net) 100-250ml + garlic oil 15ml + (wofengsu) 25ml mixed with 30 kg of water sprayed 2-3 times, sprayed 1 time in 3 days, changed to prevention after control.

Pepper anthracnose, mostly occurs in high humidity environment, there are black spots anthracnose, black anthracnose and red anthracnose, mainly for the damage to the fruit, usually produce ring-shaped lesions, it is easier to distinguish, it is recommended comprehensive prevention and control, control the temperature and humidity, enhance the growth of pepper, the early stage of the disease with oxim strobin, tebuconazole, or difenoconazole, frost manganese zinc spray prevention, interval of about ten days once, even two to three times.

What medicine to use if there are spots on the pepper.

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 and control methods: 1. Establish disease-free varieties 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 5-15 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. with melon vegetables and leguminous vegetables for more than 2-3 years of crop rotation; 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.

4. Prevention and control methods: prevention, (quick net or Liangguoan) 30-50ml + (wofengsu) 25ml + organic silicon 5g, spray regularly. **, (Quick Clean or Liangguoan) 70-100ml + garlic oil 15ml + (Wofengsu) 25ml + silicone, spray, spray 1 time in 3 days, spray 2-3 times.

Pharmaceutical prevention and control. NS-83 resistance agent can be used 100 times the solution, which needs to be prevented three times, the first time 10 15 days before planting, the second time after planting to slow seedlings, and the third time in the early stage of fruiting. You can also spray zinc sulfate once in each of these three phases, which also has a certain control effect, or 500 times of 20% virus A wettable powder and 1000 times of plant emulsion.

At the same time, it is necessary to control aphids in a timely manner.

Hello, black spot disease is generally mostly for large fruits or close to ripe fruits, the lesions are dark brown, and the later lesions are slightly sunken and shrivelled. No black particles or other pathologies have been found. It may be anthrax or black mold, and the early symptoms are consistent with both, but there are no conditions to produce the disease.

Pepper black spot disease prevention.

1. Prevent the occurrence of sunburn.

2. Harvest at the right time to prevent overripening of fruits.

3. In the flowering and fruiting period, it should be watered in a timely and uniform manner, keep the ground moist, increase phosphorus and potassium fertilizer, promote fruit development, and reduce diseases.

Foliar sprays. 1. During the growth of pepper, it is best to combine the spraying of pests and diseases, after fruit set, the appropriate spraying of urea and potassium dihydrogen phosphate of seafood powder powder has less fertilizer, high absorption rate and high conversion rate, which can effectively prevent flower and fruit fall.

2. For the south, acidic soil is prone to calcium deficiency, therefore, calcium fertilizer can be appropriately sprayed to prevent and control pepper umbilical rot with about 50 kg per mu.

3. At the peak of fresh pepper harvesting, pepper needs to absorb a large amount of magnesium fertilizer, magnesium nitrate solution, about 50 kg per mu, sprayed several times.

4. When pepper is deficient in boron, it is recommended to use sea food wo chelation boron fertilizer and spray it once every 7 days.