Prevention and Treatment Methods for Rose Sclerotinia Rot
This article provides an introduction to roses, specifically focusing on the prevention and treatment of rose sclerotinia rot. Let's take a look together.
Speaking of the prevention and treatment methods for rose sclerotinia rot (also known as crown gall, although strictly speaking, there are differences between the two), there is currently no effective method for complete eradication. This disease is highly contagious (especially when planted in the ground). If a diseased plant is found in the ground, it is recommended to dig it up and destroy it, then disinfect and kill pests in the soil around the diseased plant. Do not plant roses in this area for a short period of time.
If it is a potted plant, it is recommended to throw away the pot if the condition is severe. If the condition is mild and you do not want to discard it, you can try to treat it, but it must be isolated. If the treatment is not effective, it still needs to be thrown away.
Overall, the prevention of rose sclerotinia rot is primary, with treatment as a secondary measure. The specific prevention and treatment measures are as follows:
1. The probability of this disease in grafted seedlings is much higher than in cutting seedlings, so it is recommended to choose cutting seedlings as much as possible.
2. When rose enthusiasts receive cuttings online, they must carefully inspect the roots. If a diseased plant is found, take a photo and destroy it immediately after reporting to (W-Q) time.
3. Before planting, dip the roots in a triple concentration of anti-crown gall bacteria K84 (this is a beneficial active bacterial agent; after use, avoid using fungicides on the roots).
Special introduction to anti-crown gall bacterial agent K84: K84 bacterial agent is a biological bacterial agent (similar to the rabies vaccine as an active bacterial agent). It has strong competitive ability in the soil, preferentially colonizes around wounds, and has specific inhibitory effects on crown gall/root rot bacteria, preventing the occurrence and harm of crown gall/root rot. Compared to chemical pesticides, it has the advantages of good disease control effects, long-lasting effects, and no environmental pollution.
4. When cutting or grafting, ensure that the mother rose plant is free of the disease. Do not collect cuttings or scions from plants with crown gall disease to isolate the source of infection.
5. In general soil, the amount of pathogenic bacteria for rose crown gall disease is relatively low, and the risk of infection is small. Once the soil is contaminated with pathogenic bacteria, it can be disinfected. Chemicals such as chloropicrin have good disinfection effects.
Method for using chloropicrin: Spread the potting soil or bed soil in a layer 30 cm thick, level it slightly, and compact it. Mark the soil surface into squares with sides of 30 cm, and dig a hole about 5-10 cm deep in the center of each square. Inject 3-5 ml of chloropicrin into each hole and immediately fill the hole with soil or medium. After all squares have been filled, cover the area with plastic film and remove it after 7-10 days. Turn the soil until there is no longer an刺激性 odor. The best soil temperature for disinfection is between 2-15 degrees Celsius; below 1 degree Celsius is not effective. If the amount is small, you can put the potting soil in a plastic bag, add chloropicrin according to the above proportion, and tie the bag tightly. After one week, it can also achieve the purpose of disinfection. (Note: This chemical is highly toxic, and protective measures must be taken when applying it. Specific precautions can be found by searching online).
6. For alkaline soil, apply acidic fertilizers to acidify the soil, making it unfavorable for bacterial growth and reproduction.
7. Before pruning or grafting, disinfect the tools with high temperature or alcohol, or 10% sodium hypochlorite solution. Disinfect and protect any wounds promptly to reduce the invasion of nematodes or crown gall/root rot bacteria.
8. Apply fertilizer reasonably. A strong tree vigor can enhance the plant's resistance to pathogens. Increase the application of organic fertilizers and add phosphorus, potassium, and calcium fertilizers on the basis of ensuring nitrogen fertilizers to cultivate strong plants, which can improve their resistance to crown gall disease.
9. For plants with less severe disease, cut the tumor with a disinfected sharp knife, making sure to cut deep into the xylem, then apply 500 to 2000 times streptomycin to the wound. You can also use 300 to 400 times the concentration of "402" (ethylthiosulfonate) to pour and配合 treatment.
10. Destroy diseased plants in a timely manner. Pathogenic bacteria can survive on the surface of host tumor tissue and survive for more than one year on residual tissue. To prevent further spread of the infection, promptly remove and incinerate diseased plants, and disinfect the surrounding soil with chloropicrin or 10% Fudiduo granules.
The above are the experience and knowledge of preventing and treating rose sclerotinia rot (附图附图), hoping that this article can provide you with some help!