Control techniques of Pepper damping-off Disease

Quenching disease is one of the most important diseases in pepper seedling stage, which is distributed all over the country. It is often caused by temperature and humidity discomfort and extensive management in the seedling stage. In addition to damage to pepper Solanaceae vegetables, melons, lettuce, celery, cabbage, cabbage, radish, onions and other vegetable seedlings can be damaged. When the autumn seedlings were infected, the base of the stem showed a yellowish-green water stain, and then quickly turned yellowish brown and developed around the stem for a week. The tissue of the disease is rotten, dry and sunken, resulting in constriction. The water stains spread from the bottom up, and the young bacteria fell to the ground. At the initial stage of the disease, only a few seedlings fell ill on the seedbed, and a few days later, it gradually spread outward with this as the center, and finally caused the seedlings to lodge and die.

Incidence regularity of capsicum catchment disease

The pathogen overwintered with oospores in the soil and passed through the adverse environment, and in the following spring, under suitable conditions, the pathogen could germinate and produce sporangia, release zoospores or directly produce germ tubes to invade the host, or live saprophytic life with mycelium in diseased residual tissue or humus, and sporangium zoospores were produced in the next spring to infect seedlings, causing seedling disease to collapse. Germs are spread through Rain Water and irrigation water, and agricultural activities such as the application of bacterial fertilizers and transplanting can also spread germs.

The main factors affecting the occurrence degree of quenching disease are soil temperature, humidity, light and the level of seedbed management. The soil water content is large, the air is moist, and the temperature is between 30 ℃ 36 ℃ or 8 Murray 9 ℃, which is suitable for the growth of bacteria, but not conducive to the development of seedlings, so the disease is serious. Improper management at seedling stage often provides conditions for the occurrence of diseases, such as over-dense sowing, flood irrigation, improper heat preservation and ventilation, excessive growth of seedlings, freezing and so on. In addition, low-lying terrain, poor drainage and heavy soil and the application of immature compost are also prone to disease.

Control techniques of Pepper damping-off Disease

1. Choose the seedbed reasonably. The seedbed should choose disease-free land with high dryness, shelter from the wind and sun, convenient drainage and irrigation, fertile soil and good air permeability. In order to prevent the seedbed from bringing germs, rotten farm manure should be applied.

2. Seedbed treatment. The nursery bed should be fully turned over before sowing, and the soil of the old seedbed should be treated. Commonly used 50% carbendazim wettable powder per square meter seedbed 8 Murray 10 grams, add fine soil 5000 grams, mix evenly. The medicinal soil of 1ax 3 was used as cushion layer, and the rest of the soil was used as covering layer after sowing.

3. The seeds are mildew free. Sprouting and sowing to shorten the time of seeds in the soil.

4. Strengthen cultivation and management.

① rotates with non-Solanaceae and melon crops for 2-3 years.

② covered with plastic film prevents germs from the soil from splashing onto the plant and reduces the chance of infection.

The soil temperature of ③ seedbed should be kept above 16 ℃ and the air temperature should be kept between 20 ℃ and 30 ℃.

④ should pay attention to ventilation after seedling emergence, and strengthen ploughing and loosening soil in the soil to prevent excessive humidity of the seedling bed. Maintain good light transmission of seedling equipment, increase light, and promote the healthy growth of seedlings.

⑤ found that the diseased plants were pulled out in time and destroyed by concentrated watering to prevent the spread of the disease.

5. Chemical control. Diseased leaves and diseased plants were treated in time after diseased plants were found, and fully protected by spraying.

① was sprayed with "Qingkulike" 50-100ml spray once every 7 days for 2-3 times in the seedling raising period.

② found that the diseased seedlings were removed immediately, and promptly sprayed "Qingkulike" 50-100ml + "garlic oil" 7ml mixed with water 30 jin of water spray, 3-5 days once, 2-3 times.