Symptoms and control methods of soybean root rot

Soybean is an important plant in China, which has high economic value, and the disease that often occurs in soybean seedling stage is root rot, which has a great impact on the growth of soybean and often leads to the death of seedlings and broken ridges. So how to prevent and treat soybean root rot? Let's get to know it.

1. Occurrence of symptoms

The occurrence of root rot in soybean is that the root growth is not strong, which is characterized by less capillaries, fewer nodules, even no nodules, and the root tip turns brown. The root system of soybean is damaged, and the transport of nutrition and water is blocked, resulting in the loss of green, change, dwarfism and wilting of aboveground plants, and death of plants in serious cases.

2. The cause of disease

① sows too much. The soil strength of soybean bud top is poor, so it is not suitable for deep sowing. If deep sowing and moist soil are added, this environment can easily lead to root rot infection.

② sowed prematurely. Soybean is not sown too early, the suitable temperature for emergence and seedling stage is between 20 and 25 degrees, sowing too early can not reach the required temperature environment, coupled with the low-lying soil moisture, it is easy to be infected with root rot.

③ soil causes. Soybean root rot is a soil-borne disease, once it occurs without timely control, then it will occur every year, especially when suffering from underground pests, plus bacterial infection.

④ fertilization method. Soybean growth needs a lot of nitrogen, but its own nitrogen fixation capacity is strong, if the application of too much nitrogen fertilizer will affect the formation of root nodules, resulting in plant growth and poor disease resistance.

3. Prevention and control methods

When planting, it is necessary to apply organic fertilizer to supplement trace elements, 2000 kg of rotten farm manure per mu as base fertilizer, and 100,200kg biological bacterial fertilizer for poor soil organic matter content. It can also disinfect and sterilize the soil with antiseptic. Seed coating and seed dressing for soybean during sowing is also the most key measure to prevent root rot. Practice has proved that the incidence of root rot is greatly reduced after seed dressing. Fungicides can be used to control the seedlings with root rot disease. Fusarium, Pythium and Phytophthora are commonly used, and the control effect is very good.

The above is about soybean root rot symptoms and control methods introduced, hope to help you, want to know more related knowledge, please pay attention to us.