How to prevent peanut scab

Many kinds of diseases will be encountered in the process of peanut planting. What I want to say now is the peanut scab that mainly harms the stems and leaves of peanuts. This disease is the main disease that causes plant death to the leaves, so let's discuss why it occurs today. How to continue to harm it, how to eliminate it, and prevent it from infecting peanuts.

I. occurrence and spread

Scab is a disease caused by fungal infection, which overwinters mainly in diseased tissue and spreads through wind and rain. Moisture is a prerequisite for infection. In general, summer is the peak period of disease occurrence. In the environment of high temperature and high humidity, it propagates rapidly as conidia and begins to spread damage in a large area. Because the spore reproduction is large and fast, and the incubation period of the disease is short, the disease can be infected repeatedly.

Second, symptoms of infection

The disease is mainly infected with peanut leaves and stems, after the initial infection will form yellowish brown disuniform spots on the leaf surface, sunken in the middle of the spots, the spots formed on the back of the leaves are also irregular sunken in the middle, but the color of the spot is light reddish brown. When the stem and leaf stem attack, will produce nearly round disease spot, the disease spot gradually expand into a large disease spot, the aboveground part will die.

III. Prevention and control methods

1. Rotation

Rotation or intercropping with Gramineae crops can reduce the source of bacteria and prevent occurrence. Even if there is no crop rotation, try not to continue planting in the same piece of land.

two。 Clear

After harvest, all the aboveground stems and leaves should be centrally burned, do not give germs a chance to survive the winter, and prevent further harm in the next year.

3. Fertilizer and water

In the rainy season, we must prevent stagnant water from causing excessive soil air humidity and promote the spread of diseases. It is necessary to apply less nitrogen fertilizer and more phosphorus and potassium fertilizer, supplement trace elements and enhance resistance.

4. Spray medicine

When preparing the soil, we should spray corresponding agents to sterilize and prevent the ground from drying for a few days before sowing, and the seeds should be disinfected to avoid carrying germs. after emergence, we should first spray Zhengda "Love Seedling" and DuPont "Wanxing" medicine to prevent the disease. 50% carbendazim wettable powder 1500 times liquid to prevent and cure the first onset, 30% benzyl propiconazole 1500 times solution should be used to spray treatment, spray prevention can only be sprayed once, but the treatment must be sprayed three times every three days in order to have a good effect.

The occurrence of peanut scab disease focuses on prevention, so it is necessary to start prevention when sowing and planting before occurrence, and it is best not to use drugs to reduce residues. However, if the disease occurs, it should be controlled and eliminated as soon as possible, and if it cannot be controlled, it should be changed, used alternately, and sprayed several times for prevention and treatment.