Prevention and control of root nodule disease of cherry blossoms

Cherry blossom root nodule disease is also known as crown cherry disease. There are more than 330 species of root nodule disease belonging to 142 genera and 59 families. It harms more than 600 kinds of plants, mainly forest plants, economic forest plants and garden plants, peaches, plums, pears, apples, roses and cherry blossoms, etc., which are easily harmed by root nodule disease. Flowers and trees infected with this disease affect the development of roots, often resulting in lack of nutrition, showing a weak state, and finally withered.

Symptoms: mainly in the root neck and large root, sometimes also in the lateral root. The main symptom is the formation of tumors of different sizes and irregular shapes in the roots. The initial stage of the disease is white, the surface is smooth, gradually becomes dark brown, the surface is uneven, showing cauliflower shape. After the cherry was infected with the disease, the light ones grew slowly, the trees were weak, the fruiting ability decreased, and the heavy ones died.

Prevention and control methods:

1. When seedlings are introduced, diseased seedlings should be eliminated and disease-free seedlings should be selected.

2. Before disinfecting and transplanting seedlings, soak the roots with 1% copper sulfate solution for 5 minutes, and then transfer to 2% lime water for 1 minute to prevent and control seedlings and soil bacteria. When diseased plants are found, the root nodules are removed with a knife in time, and the wound is treated with 1% liter mercury solution or antibacterial agent 402. And apply Bordeaux paste to protect it. The root nodules cut off should be burned centrally.

(3) to treat the soil and control the disease with chemical agents. Ferrous sulfate is used to mix the soil when planting to change the acidity of the soil. When the plant is sick, remove the root nodule with a knife in time, and treat the wound with 1% liter mercury solution or antibacterial agent 402. And apply Bordeaux paste to protect it. The root nodules cut off should be burned centrally. At the same time, the root of the plant was irrigated with antimicrobial agent 402 for soil disinfection. Bacteriocin (hydrocarbons containing xylenol and cresol) can be used to treat diseased plants for more than three years. Bacteriocin has a good control effect on root nodules of seedlings. However, because the cherry blossom tree is sensitive to many chemicals, it is suggested to do a small-scale experiment first and then use it in a large area after the experiment is successful.