Andrographis disease control
Bacterial damping-off: It is caused by fungi. It occurs at the seedling stage. When two true leaves grow, the damage is serious. The stem base of the seedlings shrinks, and the diseased seedlings appear gray mycelium, which occurs sporadically in the seedbed at the beginning of the disease. The spread is very fast, and one night there will be deaths. The etiology is caused by high soil moisture, unobstructed seedbeds, and severe onset in rainy days and at night compared with sunny and daytime conditions.
Control methods: reduce watering after emergence, pouring early water, ventilation around seedbeds, pay special attention to ventilation at night and rainy days, reduce soil temperature, and strengthen light. At the beginning of the disease, it is sprayed with Bordeaux 1:1:120, and 50% Topazel WP can also be sprayed with 1000 times.
Fusarium wilt: Mainly endanger the roots and the whole basal part. Occurrence time From June to October, both seedlings and adult plants can occur. During the seedling period, the environment is wet, and white cotton-like mycelium appears at the base of the stem and around the surface. It usually occurs locally. At the early stage of disease, the leaves on the top of the plants turn yellow, the lower leaves are still green and blue, the plants are short, the roots of the roots and stems turn black, and the whole plant dies.
Control methods: The breeding grounds are forbidden to select low-lying land, do not pour water when irrigation, do not accumulate water, do not weigh, do not harm plants, have wounds easily inoculated with Fusarium, and are prohibited and easy to get the wilt plant rotation.
Black stem disease: Black stem disease mostly occurs in the high-temperature and rainy season in July-August. Occurs in the base and ground parts of stems. Long strips of dark spots extend upwards and downwards, resulting in thin and thin stems. Leaves turn yellow and green, sagging. Rolling inwards, serious plants die.
Prevention methods: Strengthen field management, clear drains, prevent water accumulation in the ground, and increase phosphorus and potassium fertilizers.
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