What symptom does rose appear root cancer disease to have? What shall I do?

Root cancer disease, also known as root cancer disease, is one of the most common root diseases in garden flower seedlings, such as rose, cherry blossom, peach, rose and so on. What are the symptoms of root cancer in rose? What shall I do?

What symptom does rose root cancer disease have?

Rose root cancer mainly harms the root neck, main root and lateral root of rose, while rose seedlings mostly occur in the place where scions and rootstocks heal. At the beginning of the disease, there were small round tumors, and then gradually enlarged, hardened, rough surface, cracked, color changed from light to dark brown or dark brown, and Lignification inside the tumor. Tumors vary in size, as big as fists or larger, and the number varies from several to a dozen. Due to the destruction of the root system, the diseased rose plants grow slowly, and the serious ones die of the whole plant. The disease is very stubborn. Even if the cancer is removed, it can often grow again.

The pathogenic bacteria overwintered in the cortex of the tumor tissue, or when the tumor tissue rotted and ruptured, the bacteria mixed into the soil, and the cancer bacteria in the soil could survive for more than one year. Germs are transmitted by water flow, underground pests, grafting tools, farm tools, etc., and diseased flowers and trees can be transported and transported over a long distance. Pathogens invade the host through wounds, insect injuries, mechanical injuries caused by farming, cuttings, marriage interfaces, and other injuries, all of which can be the ways for bacteria to invade.

Second, how to do when root cancer occurs in rose?

1. Rose cultivation as far as possible to avoid all wounds conducive to the invasion of bacteria. The split grafting method commonly used in rose grafting forms a large wound and is most susceptible to disease when it comes into contact with bacteria-carrying soil. Therefore, bud grafting instead of split grafting is beneficial to the prevention and treatment of root cancer.

2. the damage caused by underground pests will cause root injury and increase the chance of disease. Timely control of underground pests can reduce the incidence of disease.

3. Choose disease-free soil as nursery to avoid repeated cropping. Orchards and nurseries where root cancer has occurred cannot be used as nursery grounds. Soil disinfection should be carried out in the nursery, with 50-100 grams of sulfur powder or 60 grams of 50% formalin per square meter.

When grafting seedlings, the wound should not come into contact with soil, and 75% alcohol should be used to disinfect the grafting tools before and after use. It is better to change branch grafting to bud grafting.

Acid fertilizer or organic fertilizer should be applied properly in alkaline soil to change the soil pH value and make it unfavorable to the growth of bacteria. Timely drainage in the rainy season to improve the permeability of the soil. Root damage should be minimized when ploughing.

4. the diseased seedlings must be treated with medicine before they can be planted. You can choose a solution of 500 to 2000 times streptomycin for 30 minutes or soak in 1% copper sulfate solution for 5 minutes. Diseased plants can be irrigated with 300 to 400 times or smeared the wound with 500 to 2000 times streptomycin or 500 to 1000 times oxytetracycline after tumor resection.