In the process of cassava planting, bacterial wilt may be infected due to improper management, etc. The following small series talk about the harmful symptoms, pathogenesis and prevention methods of cassava bacterial wilt.
Cassava bacterial wilt, also known as gum disease, is one of the most serious worldwide diseases of cassava, which has a wide range of occurrence, rapid onset and serious harm. It is a systemic disease, mainly affecting leaves and stems, which can cause more than 50% of yield loss.
First, the symptoms of harm
It is mainly harmful to the leaves and stems, and is systematically harmful to the whole plant. When the leaves are infected, wet spots are formed. When the humidity is high, the glue is caused by the damaged part, and the white mucus is initially formed, and then turns into a yellowish brown. Stem infection, often caused by stem depression, secretion of a large amount of colloids, accelerate the leaf withered. When the roots are infected, the vascular bundle turns yellow-brown, and the roots and vascular bundles appear dry rot, which causes the whole plant to die in severe cases.
Second, the law of incidence
High temperature and rain are prone to the disease. There is a difference in disease resistance between varieties. The pathogen survives in the phloem of the old stalk, and is mainly spread by the stems of the bacteria. In addition, rain, insects, diseased soil and bacteria tools can spread the disease. Production of weakly planted diseased plants, shortly after germination, flow on the petiole and stem, the pathogenic bacteria in the gum spread to the healthy plants through the rain, first form a horn on the leaves, the disease is also flowing when the humidity is high, making the disease The bacteria in the plaque are transferred from the duct to the stem through the blade and move up and down, causing disease and fluid.
Third, prevention and treatment methods
1. Choose disease-free seedlings and varieties with strong disease resistance.
2. After the seedlings are germinated, the diseased plants are found to be rooted and removed, placed in a plastic bag and carried out in the market for deep burial or burning. After removing the diseased plant, it should be replanted every 2 to 3 weeks.
3. Remove the dead leaves and leaves before the new cassava seedlings, and dit the drainage to reduce the humidity in the field.
4, the implementation of rotation (heavily ill field soil should be stopped for more than 6 months), can be rotated with other non-host crops.
5. Disinfect the diseased soil and agricultural implements, and control the flow of water from the diseased fields and the soil into the disease-free fields.
6, before the onset of prevention with simianamine acetate; the early stage of the disease can be used to prevent and control the national light.
The above is the bacterial wilt of cassava and its control methods. In addition to bacterial wilt, cassava has bacterial keratosis, brown spot plaque, anthracnose, etc. Therefore, farmers should do a good job in prevention and control, and promote cassava. High yields and income.
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