What are the characteristics of scab leuketosis? What are the prevention and control measures?

In our pepper-producing region, there are mild or severe cases almost every year. The disease will affect the photosynthesis of pepper plants, which in turn will affect the yield and quality of peppers.

So, what are the characteristics of scab leuket?

Pepper scab scab is a fungal disease that can be seen during almost the entire growth period from seedling to harvest. At the time of the disease, the main damage is the leaves of peppers. When the plant is sick, there will be a large amount of leaf loss.

In the early stage of pathogen infection, it can be seen that the old leaves in the lower part of the plant first show the symptoms of the disease, and with the development and spread of the disease, it gradually damages the leaves of the upper part of the pepper. At the beginning of the disease, small green-fading spots can be seen on the leaves, which will gradually expand into 1-2 mm round-like spots with dark brown and slightly raised edges, and white or grayish-white in the center. In later stages, the lesions will scatter black granular conidia.

When the humidity in the field is low, the lesions will crack and holes will form in the leaves. When a plot is severe, hundreds of large and small lesions will form on a single leaf, and the leaves starting from the old leaves will dry up and fall off.

What are the prevention and control measures for pepper scab?

1.For the prevention and control of pepper scab, the plant protection principle of "prevention first, prevention and control combined" should be adopted, and agricultural and chemical control methods should be adopted for comprehensive prevention and control.

2.Choose pepper varieties with strong growth and good disease resistance. Such as: Xiangyan No. 3, Zhongjiao No. 5 and other varieties.

3.Before sowing, pepper seeds are placed in an environment of 55 degrees for 24 hours, and the seeds are soaked at high temperatures to help kill the germs on the surface of the poisonous seeds.

4.The selected planting plots should be rotated with melons and beans for two to three years, which can effectively avoid the occurrence and spread of diseases.

5.Formula fertilization technology should be adopted, and priority should be given to the use of fully decomposed high-quality organic fertilizer, and attention should be paid to increasing phosphorus and potassium fertilizer to improve the disease resistance of pepper plants.

6.Pepper planting should be carried out in a field with high terrain and is not prone to water accumulation.

7.Once the disease occurs in the field, the diseased plants should be uprooted in time and taken out of the field for centralized deep burial or incineration.

This is a common disease, after the leaves of pepper will be infected, it will spread from the lower part to the upper part, and then there will be small green spots at the beginning, and after expansion, it will become white, and there will be small black particles in the middle; After that, it is necessary to use pesticides to spray, be sure to prescribe the right medicine, usually should do a good job of insecticide and weeding, water and fertilize in time, and the temperature should not be too high during the planting process.

The leaves of the pepper will have some small white spots, and it will also protrude, and the leaves will rot, which will also cause the leaves to fall off or the flowers to become smaller, some pesticides should be sprayed, and the peppers with scab can be pulled out, and the peppers with scab should be watered more, the sunlight should be increased, and the temperature should be kept at about 20 degrees so as to prevent and control scab.

It will be white or off-white, with some small dark brown spots and some black spots, we must pay attention to reasonable fertilization, need to pay attention to crop rotation, pay attention to the cleaning of the field, strengthen management, and spray drugs on time.

The prevention and control of pepper scab scab requires the implementation of alternate year rotation, and the diseased leaves should be removed in time after harvest and destroyed in a centralized manner. In the early stage of the disease, the pesticide prevention and control can be sprayed with 500 times of 50% copper succinate wettable powder, or 1500 times of 65% zebsen wettable powder, or 300 times of 14% copper ammonia aqueous solution, or 500 times of 77% copper hydroxide wettable particle powder, etc., sprayed once every 10 days or so, and sprayed 2 3 times continuously.

Pepper scab scab can occur at both seedling and adult stages, and mainly damages leaves. The lesions are round or nearly round at first, about 5 mm in diameter, and the edges of the lesions are small dark brown spots, slightly raised, **white or grayish-white, and small black spots are scattered on them. Sometimes the middle of the lesion falls off, and in severe cases, a large amount of defoliation is caused.

The disease is caused by a semi-intellectual fungus.

Prevention and control methods: spray 700 800 times dilution of 65% zebsen wettable powder, or 500 times dilution of 50% copper succinate sulfate (DT) wettable powder, or 300 times dilution of 14% copper ammonia aqueous solution, spray 1 time every 7 10 days, and prevent and control 2 3 times as appropriate.

Cayenne pepper scab.

Fungal disease, lesions round or oval, brown edges, **grayish-white, with small black granules.

Prevention and control, mancozeb and copper ammonia can be sprayed in the early stage of the disease, which can be killed and controlled, and re-sprayed 2-3 times in 5-7 days.

Due to the production process, content, and hidden ingredients of pesticide companies, please go to the local distributor to seek the ideal insecticide and better solution according to the condition.

(1) Implement crop rotation for more than 2 years.

2) Remove the remains of diseased plants in the field in time, bury them deeply or burn them, and reduce the source of disease in the field.

3) Drug prevention and treatment. At the initial stage of the disease, 70% methyl tobuzine 1000 times solution, 80% zebsen 700 800 times solution, 25% reinomycin 800 times solution, 5% chlorothalonil 600 times solution and other sprays were alternately sprayed, once every 5 7 days, sprayed 3 4 times in a row, until the onset was controlled.

Prevention and control methods] remove the diseased residues in time after harvesting, and burn them intensively to reduce the source of primary infection. Apply fully decomposed organic fertilizer, pay attention to increasing phosphorus and potassium fertilizer. Cultivate strong seedlings, plant in a timely manner, and the density should not be too large.

In the early stage of the disease, the following fungicidal agents or formulas can be used for prevention and control: 50 azoxystrobin water-dispersible granules 4000-6000 times liquid; 50 thiophanate-methyl suspension 500-800 times 70 mancozeb wettable powder 600-800 times; 25 1000 times of pyroxystrobin suspension 65 600 times of zeb wettable powder; 50 Pythium 1000 times WP 75 chlorothalonil 600 times wettable powder; 50 1000 times of iprodione suspension; Spray water evenly every 7-10 days depending on the condition.

The pathogen can survive and overwinter in the greenhouse, and the pathogen develops quickly and often becomes a pandemic in a short period of time because it takes about 20 hours from the germination of the spores to the invasion. 10 30 germs can be active, the optimal temperature is 20 25 . The relative humidity is 45% and 75% is fast, and when it is less than 25%, it can also cause conidia germination and cause disease, and more than 95% is significantly inhibited.