How to prevent and cure the root swelling disease in the continuous cropping of vegetables

Vegetables are very easy to get root swelling disease when they are planted in continuous crops. after the disease, the vegetable seedlings will appear short, and the sun leaves will wither. after pulling out the seedlings, you will often see a string of tumors in the roots, and the serious roots have completely rotted. So how to prevent and cure the root swelling disease in continuous cropping of vegetables? Let's take a look.

1. Main symptoms of root swelling disease

The leaves of the diseased plants become pale, wither and droop, and the roots are swollen and nodulous. once the disease progresses in the later stage of the disease, there is no cure, and the reason for the occurrence of root swelling disease is mainly due to respect for pathogens in the soil. especially in the fields where rape and cabbage vegetables have been planted for years, there are a large number of dormant sporangia of Brassica root swelling bacteria in the soil, which will wake up under suitable conditions, resulting in the occurrence of root swelling disease in vegetable seedlings.

II. Inducing factors

1. The high humidity environment is conducive to the reproduction and development of bacteria, so when the soil moisture is high or the low-lying flooded land and the field changed from water to drought are very prone to root swelling disease.

2. There is also a certain relationship between the occurrence of root swelling disease and soil. It is found that the incidence of root swelling disease is higher when the soil is slightly acidic, but rarely occurs when the pH value is higher than 7.2.

3. The attack of root swelling disease is also related to trace elements, and it will also be induced when the soil is deficient in calcium.

4. The spores of root swelling disease can occur in the temperature environment of 9-30 degrees, and the most suitable breeding temperature is 23 degrees.

III. Prevention and control measures

1. After more than 3 years of rotation, flood-drought rotation is better. It is best not to use glyphosate herbicides to control weeds in areas with serious root swelling disease, and the seedling bed is sterilized with 400 times solution of 50% dimethazone.

2. Adjust the acidity and basicity of the soil. When the soil is acidic, 100-150 kg of lime per mu is evenly spread on the soil surface, and fully mixed in the soil through soil preparation.

3. Diseased plants should be removed in time, boiled or dried at high temperature and burned uniformly. Diseased plants must not be left in the field or thrown in other areas to prevent the spread of bacteria in a larger area. After that, 1% lime liquid or 1% lime liquid + 75% chlorothalonil wettable powder 1000 times liquid was used for prevention and control.

The above is the introduction of how to prevent and cure root swelling disease in continuous cropping vegetables. I hope it can help you. If you want to know more about it, please pay attention to us.