Autumn fruit tree rot is effective

In the management of fruit tree rot, for many years, attention has mainly focused on spring prevention and treatment, while autumn measures have often been overlooked. This imbalance leads to a high recurrence rate of the disease, making it difficult to fully control. However, by understanding the life cycle of the pathogen and applying a comprehensive strategy that includes both spring and autumn interventions, effective control can be achieved. First, understanding the disease's occurrence pattern is crucial. The apple rot fungus is a weak parasite that overwinters in the bark in the form of mycelium, conidia, and spore angles. Spores are primarily spread through rain splash. During summer, when trees are actively growing, the environment is less favorable for pathogen spread. However, dead tissues in the bark provide ideal conditions for infection. As the tree enters dormancy, its resistance decreases, leading to an increase in visible symptoms, though the progression of the disease during this period is slower. Second, focusing on key control points is essential. There are two peak periods for the disease: spring and autumn. While spring is the main period, autumn can also see a smaller outbreak depending on weather conditions, especially rainfall. Rot disease behaves similarly to a "seedling" infection, and the most critical time for prevention is during the infestation period, which occurs mainly in autumn. If spring prevention is incomplete, old lesions may recur, and new infections can occur, leading to a higher risk of disease in the fall. This is why many growers focus too much on spring treatments and neglect autumn control. To improve control strategies, several steps should be taken. First, enhancing tree nutrition and overall health is fundamental. Balanced fertilization, proper fruit load management, and leaf protection help build stronger defenses against diseases. Second, targeted chemical treatments in autumn are essential. After the shoot growth period and before harvest, spraying solutions like 50 times chlorhexidine, 800 times thiophanate-methyl, or 78% Kebao diluted 500 times can be effective. Early basal fertilization and timely harvesting are also important. Combining spring curettage with autumn treatments is another key approach. Before the spring peak, any existing lesions should be thoroughly removed. Using a knife, the affected area should be scraped down to healthy tissue, creating a spindle-shaped wound that promotes healing. After scraping, applying agricultural anti-120 agent at 10 times strength or using a strip painting method with agricultural resistance 120 or rot must clear helps prevent re-infection. During the growing season, follow-up treatments are necessary for large lesions. Repeating the curettage process and applying 3–5 times of rot must clear or 843 recovery agent solution can lead to full recovery. Precautions include avoiding phytotoxic chemicals like formaldehyde during lesion treatments, ensuring thorough removal of infected tissues, and combining winter pruning with cleanup of diseased shoots. With consistent autumn and spring prevention over 2–3 years, the disease can be fully controlled. Improving tree resistance through proper fertilization and load management is the foundation of disease prevention. Finally, considering the way spores spread via rain, treating scraped areas with 4% agricultural anti-720 fruit tree liquid in autumn helps eliminate latent infections. Combining these methods with regular sprays of 4% agricultural anti-120 or Bordeaux mixture (1:2:200) 3–4 times a year can effectively eradicate pathogens and prevent future outbreaks.

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