Why does anthracnose, a common disease of pepper, occur frequently? How to prevent and cure it? What kind of medicine should I use?

Pepper is a common vegetable and can be used as a side dish, which is mainly distributed in Sichuan, Guizhou, Hunan, Yunnan, Shaanxi, Henan (Xichuan County), Jize County, Hebei Province and Tuoketuo County, Inner Mongolia. In the process of planting pepper, the prevention and control of diseases is particularly important. Anthracnose is one of the common diseases that affect the yield and quality of pepper. What is the cause of anthracnose? What are the symptoms? How to prevent and cure? What kind of medicine do you use?

I. the cause of anthracnose in pepper

Pepper anthracnose, also known as pepper continuous cropping disease, is the main disease of pepper, the distribution is widespread and serious. Under the condition of high temperature and high humidity, the epidemic spreads quickly, the damage time is long, the damage is serious and the loss is great.

1. Variety difference

The disease resistance of line pepper is worse than that of sweet pepper. In recent years, wet and mixed varieties, degradation, is also an important reason for the epidemic of the disease.

2. Continuous cropping

After years of planting, the pathogen accumulates quickly and the base number is high. Once the conditions are suitable, the disease will expand and spread rapidly.

The removal of diseased leaves, diseased fruits and residues is not complete, and the bacteria continue to spread outward through wind and rain. Even if the new stubble is new, as long as the pathogen exists and the conditions are suitable, it can cause disease outbreak and epidemic.

3. The management of seedbed is not scientific.

That is, without seed chemical sterilization and soil disinfection, under the conditions of high temperature and high humidity, seedling bed infection can continue to harm after moving into the field.

Germs invade from the wound and spread through wind and rain, air currents, aphids, hopping cicadas and other stinging pests.

The development temperature of the pathogen is 12-32 ℃, the suitable temperature is 27 ℃, and the relative humidity is about 95%. The rainy season comes early and the temperature and humidity are suitable, which is also an important reason for the occurrence and epidemic of the disease.

II. Symptoms of anthracnose in pepper

Pepper anthracnose mainly harms pepper fruit, as well as leaves, pedicels and stems. The fruit is damaged, the disease spot is brown, waterlogged, oblong or irregular, sunken, with slightly raised concentric wheel pattern, on which there are a large number of black spots, there are moist discoloration circles around the disease spot, and the disease spot is often dry and shrinking when it is dry. it's thin and easy to break. The leaves infected with the disease, initially showed water-stained spots, gradually turned brown, the disease spots were round and gray-white in the middle, the upper whorls were black spots, and the diseased leaves were easy to fall off. The fruit stalk and stem are infected, the spot is brown, slightly sunken, the shape is irregular, and the spot is easy to crack when dry.

Third, how to prevent and cure pepper anthracnose? What kind of medicine do you use?

1. Select and popularize disease-resistant varieties.

2. Rational rotation: rotation with wheat and corn for 2-3 years to avoid continuous cropping with melons and vegetables.

3. Strengthen the cultivation management. According to the characteristics of varieties, water and fertilizer conditions, reasonable close planting; timely ventilation and moisture drainage in the greenhouse to avoid high temperature and humidity; timely drainage after rain; timely removal of diseased leaves, diseased fruits and residual plants; increased application of phosphorus and potassium fertilizer to improve the disease resistance and immunity of plants.

4. Chemical control: when raising pepper seedlings, Aut can be mixed with soil, 2-5 kg / mu can be used before planting (the dosage is determined according to the severity of continuous cropping), or Aut is applied regularly during the growth period, which can effectively control continuous cropping diseases, dead seedlings, make plants strong, enhance crop disease resistance and reduce disease.

Spraying hot pepper every 15 days or so before the disease, 20ml mixed with water 15 kg, can prevent the occurrence of pepper disease, the initial stage of the disease every 10-15 days to spray anthrax, the dosage is 20ml to a pot of water (15 kg), 3-4 times.

When the disease is serious, the whole pepper can be sprayed evenly with 15 kg water for 20ml pepper and 20ml anthrax or 15 kg water for 30ml anthrax.