First, the incidence of symptoms and symptoms of damping-off disease is one of the important diseases of pepper seedlings, the disease in addition to damage pepper vegetable Solanaceae vegetables, melons, lettuce, celery, cabbage, cabbage, radish, onions and other vegetable seedlings can be victimized. Often caused by improper temperature and humidity during nursery period, and extensive management, severe disease often causes seedlings to fall into lodging. The main factors affecting the occurrence of damping off disease are soil temperature, humidity, light and seedbed management. Soil moisture, air humidity, temperature between 30-36 °C or 8-9 °C, suitable for the growth of bacteria, but not conducive to the development of seedlings, and thus the incidence of heavy. Improper management at the seedling stage often also provides conditions for disease occurrence, such as dense planting, flood irrigation, improper ventilation and ventilation, and leggy seedlings and colds. In addition, low-lying, poorly drained and viscous soils and the application of unrefined compost are also prone to disease. The occurrence of damping-off occurs in early spring nursery or nursery trays. The common symptoms are bad, dead, and tripping. Rotten seed is dead after sowing when it has not yet germinated or just germinated. After the seedlings were unearthed, the true stems of the young stems had water-stained dark spots before they were unfolded. They spread thinly around the stems, gradually contracted into thin lines, and the cotyledons did not wither. The seedlings of the seedlings fell due to their loss of supporting ability. On the ground, when the humidity of the seedbed is high, white cotton Mycelium hyphae are often densely planted on the diseased seedlings and nearby beds, which can be distinguished from blight. When the autumn seedlings were infected, the base of the stem was yellow-green water-stained and soon turned yellow-brown and developed to a week around the stem. The diseased tissue rots and dies, causing contracture. The water stain spreads from bottom to top, and the young bacteria lay down on the ground. At the beginning of the disease, only a few seedlings developed on the seedbeds. After a few days, they gradually spread outward and spread out, eventually causing the seedlings to fall to death.
Second, control methods 1, a reasonable choice seedbed seedbed should choose high-rising, sheltered sunny, drainage and irrigation is convenient, fertile soil, good air permeability and disease-free plots. In order to prevent the seedbeds from infecting pathogens, decomposed farmyard manure should be applied. 2. Seedbed seedbeds should be fully sunbed before seeding. The old seedbeds should be treated with seedbed soil. Commonly used 50% carbendazim WP 8-10 grams per square meter seedbed, 5000 grams of fine soil, mixed uniformly, or take 1/3 of the drug soil as a cushion, after sowing the remaining 2/3 of the drug soil as a cover layer ; Or per square meter nursery bed can choose 40% chlorobenzene 9-10 grams of chlorobenzene, add fine soil 4-4.5 kilograms soaking before sowing the bottom water, until the water seepage, take 1/3 of the drug soil in the 畦On the surface, sow the seeds of the buds to sow, and then cover the remaining 2/3 of the soil. 3. The seeds should be germinated and germinated so as to shorten the time of the seeds in the soil. 4. Strengthen cultivation and management: (1) Implement rotation for 2-3 years with non-solanum and cucurbit crops; (2) Cover mulch to stop germs from splattering on plants and reduce the chance of infection; (3) Keep seedbed soil temperature above 16°C The temperature is maintained between 20-30°C; (4) Pay attention to ventilation after the emergence of seedlings, and at the same time, strengthen soil cultivation and loose soil to prevent seedbed humidity from being excessive. Keeping the seedling equipment in good light transmission, increasing the light, promoting the healthy growth of the seedlings; (5) Finding the diseased plants in a timely manner to remove them, concentrating on them, and preventing the disease from spreading. In the early stage of disease, 75% chlorothalonil powder 800 times can be used for prevention and treatment.
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