Prevention and treatment of root swelling disease of rape

Rape root swelling disease is a fungal disease, mainly harmful to the roots of rape, often leading to a serious decline in the yield and quality of rape, then rape root swelling disease how to do it? Let's take a look at the prevention and control methods of rape root swelling disease together with Xiaobian.

1. Symptoms

Root swelling mainly occurs at the root, the disease is the root will be spindle or irregular deformity of the "tumor", mainly occurs on the taproot, small lateral roots, the initial tumor surface smooth, white, then gradually turn brown, avoid rough, time will also appear cracking. At the early stage of the disease, at noon because of the higher temperature, rape transpiration is larger, will emit a lot of water, and the root system because of tumor damage, water absorption and fertilizer absorption capacity reduced. Because in the case of water shortage, the plants on the ground will also wither, and as the disease worsens, the diseased plants will completely wither or even die.

2. Causes of occurrence

First of all, the pathogenic bacteria overwinter and oversummer in the soil, and the pathogenic bacteria have strong vitality and can survive in the soil for more than 10 years, and the disease area is continuously cropped for a long time, which provides favorable conditions for the propagation of the pathogenic bacteria. It is because of long-term application of chemical fertilizers, chemical pesticides, etc., and no improvement of the soil, resulting in serious soil acidification. Third, climate change. In recent years, the temperature after rape transplanting is high, and the soil humidity is high, especially the low-lying terrain of some fields and the disease is serious after changing water to dry land.

3. Prevention and control methods

Comprehensive measures should be adopted to control rape root swelling disease. First, reasonable rotation should be carried out for more than 5 years with non-cruciferous crops. When planting, select varieties with strong disease resistance, advocate seedling raising with nutrient bowl, disinfect the seedbed before sowing, and cultivate virus-free seedlings. Before transplanting, use lime water or thiram 1000 times solution to soak roots or use as root fixing water. When fertilizing, try to avoid a large amount of chemical fertilizer to avoid acidification of the soil. The diseased field can be changed with lime to make the soil slightly alkaline and reduce the disease.

The above is an introduction to the prevention and control methods of rape root swelling disease. I hope it can help you. If you want to know more about it, please pay attention to us.