Peach rot disease, commonly referred to as blight, is a serious condition that affects peach trees. It causes the death of shoots and forms ulcers on larger branches and trunks. If left untreated, the entire tree can die within a short period. The primary causes of this disease include cold injury, improper management, incorrect fertilization, and prolonged autumn rains, which delay dormancy and weaken the tree’s cold resistance.
To prevent and manage peach rot effectively, several key strategies should be implemented:
**Strengthening Tree Health**
1. **Proper Fruit Load Management**: Adjust the fruit yield based on the tree's health and nutrient levels to avoid overburdening the tree.
2. **Balanced Fertilization**: Increase the use of organic matter, phosphorus, potassium, and micronutrients while limiting excessive nitrogen. This helps maintain strong, healthy growth.
3. **Root Protection and Leaf Retention**: Early leaf fall weakens the tree and increases susceptibility to disease. Prevent pests and diseases that cause premature defoliation to keep the tree vigorous.
**Tree Protection Measures**
1. **Preventing Cold and Sun Damage**: During winter, paint the trunk with white wash to reduce temperature fluctuations and protect against freezing. In summer, ensure leaves provide shade to prevent sunburn. A common whitewash formula includes 12–13 kg of quicklime, 2 kg of lime sulfur (around 20°Bé), 2 kg of salt, and 36 liters of water. This also helps prevent sunscald on branches.
2. **Wound Protection**: After making large cuts or removing diseased areas, apply protective coatings such as varnish, thiophanate ointment, or S-921 antibacterial agents. For deep lesions, it’s essential to bridge and protect them promptly after treatment.
**Lesion Treatment**
1. **Bark Scraping**: Peach rot typically affects the outer bark layer. Before the tree starts growing, remove the affected and dead tissue. This helps eliminate pathogens and stimulates callus formation for faster healing. After scraping, apply a mixture of 7 parts of thiophanate-methyl WP and 2.5 parts of vegetable oil directly on the wound. Alternatively, use S-921 antibiotic solution or 843 recovery agent at 20–30 times dilution to prevent recurrence.
2. **Using RBF Fruit Tree Protective Film Agent**: Developed by the Shanxi Orchard Research Institute, this high-tech product is effective in controlling peach rot. It can be applied as a paint or spray and has both sterilizing and protective properties. Studies show a 94% cure rate, less than 5% control failure, and under 3% recurrence. It also promotes new skin growth, restores tree vitality, and boosts fruit yield.
**Application Methods**
- **Spring Application**: Spray the full crown 150–200 times diluted before and after leaf fall to prevent peach rot. This also reduces water loss, suppresses sap flow, and improves cold and drought resistance.
- **Trunk Treatment**: Brush the main trunks with 50–60 times diluted liquid instead of lime sulfur to suffocate eggs in crevices, reducing pest infestation.
- **Post-Treatment Care**: After scraping the infected area, apply a 5–10 times diluted solution to promote healing and recovery.
By following these practices, growers can significantly reduce the risk of peach rot and maintain healthy, productive orchards. Regular monitoring and timely intervention are key to long-term success.
Ai Monitors,4 Channel Dvr Monitor,4G Hd Car Dvr Monitor,Car Dvr Security Monitor
Vsstech Co.,Ltd. , https://www.vsstechcctv.com