Control Methods for Rose Sclerotinia Canker
Answering netizens' questions about the introduction of roses in the Flower Clinic, the control methods for rose sclerotinia canker, and the specific related content is as follows:
Rose sclerotinia canker is a disease caused by a bacterium belonging to the Agrobacterium genus. This disease mainly occurs on the root collar, lateral roots, and grafting sites. For roses, sclerotinia canker is akin to cancer, and it is also known as root cancer.
Symptoms:
In the early stages of the disease, grayish-white tumor-like masses form on the affected areas, with a rough surface and soft internal tissue, which is white. As the tumors grow larger, the epidermis dies, turning brown to dark brown, the internal tissue becomes hard and woody, and the size varies. Roses with tumors grow poorly, leaves turn yellow, the number of roots decreases, and the tumors double in size. Sclerotinia canker is contagious; if roses with pathogens are planted in the same plot of land, they will infect other healthy plants.
Causes of the disease:
1. The seedlings were purchased with pathogens and the disease broke out due to the lack of disinfection of the seedlings.
2. Infected plants were not isolated or destroyed, leading to the spread of the disease to other healthy plants.
3. The bacteria causing rose sclerotinia canker overwinter on the surface of tumor tissue and in the soil, lasting for several months to more than a year. They can infect through insect bites, grafting wounds, pruning wounds, cutting wounds, or other injuries.
4. Generally, there will be pathogens of root cancer in the soil, and the soil has not been disinfected.
Control methods:
1. Strictly implement quarantine measures, select disease-free seedlings for planting, rigorously discard diseased seedlings, soak roots in a 100-fold solution of copper sulfate for 5 minutes before planting, or soak roots in 100-200ppm streptomycin for 20-30 minutes.
2. Strengthen management, apply more organic fertilizers, add phosphorus and potassium fertilizers, prevent waterlogging, and promote root growth and development. For alkaline soils, apply acidic fertilizers to acidify the soil, making it unfavorable for bacterial growth and reproduction.
3. Pay attention to frost prevention, promptly control underground pests, minimize wounds during field operations, and pay attention to the disinfection and protection of various wounds to reduce bacterial infections.
4. Treat the tumors early. When the tumors grow to the size of soybeans, remove them to aid in wound healing. If the tumors are too large or densely clustered around the stem, they are more difficult to cure. After scraping, the wounds should be disinfected with a 5-degree Bordeaux mixture or a 100-fold solution of copper sulfate, 80% "402" antibacterial agent emulsion 50-fold solution, or 400ppm streptomycin, and then coated with Bordeaux paste for protection.
5. Biological control. Before planting, soak the roots or cuttings in a bacterial suspension of Agrobacterium radiobacter strain K84 (with a bacterial concentration of 10 million bacteria per milliliter) to effectively prevent the occurrence of root cancer.
6. Select seedlings with strong resistance to diseases. Seedlings with strong resistance can also resist the invasion of root cancer to some extent.
The above information on the control methods for rose sclerotinia canker is provided for your reference and we hope it brings a little help to your life!