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[Symptoms] The disease is mainly responsible for the roots of the roots. In the initial stage, yellowish-brown necrotic dots are formed at the base of the rhizomes, and later become nearly oval to irregular necrotic spots. Further up and down development causes all the roots and even the root system to become infected. At the same time, the leaves of the diseased seedlings gradually dry up from the bottom up, eventually causing necrosis of the entire seedlings.
[Implications] The pathogens overwinter with the diseased body with hyphae and sclerotia in the soil or on the diseased tissue. In the following year, the host invaded the host with hyphae, and the initial infection was formed. It spread along with soil, fertilizer, and watering, causing re-infection. Ground temperature 10-28 °C can infect the disease, with 16-20 °C as the most suitable. The soil is too dry and too wet, sand land or seedlings are prolonged, and temperature discomfort is beneficial to the onset. The Yangtze River valley can be attacked almost all year round.
[Control methods]
1. Proper sowing. Appropriate late sowing of spring beans, appropriate early sowing of broad beans in the autumn, so that seedlings avoid the rainy season.
2. Seed treatment. Can be used seed weight 0.3% of 45% Tex multi-suspension adhered to the surface of the seed, and then mixed with a small amount of fine soil after sowing. The seeds can also be moistened with a dry seed weight of 0.3% of 75% Wetford wettable powder or 40% seed dressing double wettable powder, or 50% Liacella wettable powder or 70% soil wettable powder. Species.
3. Apply sufficient organic fertilizer and apply superphosphate or potassium fertilizer. Strengthen water and fertilizer management, reduce root injury, avoid soil being too wet or too dry, and increase plant resistance to disease.
4. At the beginning of the disease, use the agent for prevention and treatment. It can be used to spray the stems with 30% times of emulsifiable concentrate l000 times, or 5% of Jinggangmycin with 1000 times, or 45% of Tektronix suspension with 1,000 times of water, or 50% of acetaminophen WP with 1000 times of water. Base, 7-10 days 1, depending on the condition of prevention 1-2 times.
Symptoms and Prevention of Bacterial Blight in Holland
Blight is an important disease of Dutch beans, widely distributed, and occurs more commonly. Protected areas and open fields have occurred, and the disease has been seriously affected by open field. Individual sheds have also suffered from severe disease, often resulting in dead seedlings and significantly affecting production.