Autumn fruit tree rot is effective

In the management of fruit tree rot, for many years, attention has primarily focused on spring prevention and treatment, while autumn control has often been overlooked. This imbalance leads to a high recurrence rate of the disease and makes complete eradication difficult. However, based on the life cycle of the rot pathogen, integrating autumn prevention with spring treatment is essential. By addressing large lesions during the transition period and combining both seasonal strategies, effective control can be achieved. First, understanding the disease cycle is crucial. The apple rot fungus is a weak parasite that overwinters in the bark in the form of mycelium, conidia, and spores. Spores are spread through rain splash, and although the summer is a time of active growth for the trees, it's not ideal for pathogen spread. However, dying tissues in the bark create favorable conditions for infection. As the tree enters dormancy, its resistance decreases, leading to an increase in symptoms, though the spread during this period is slower. Second, key control points must be addressed. Rot disease has two main infection periods: spring and autumn. While spring is more critical, autumn can also see a smaller peak depending on rainfall. The core of managing the disease lies in effective prevention during the infestation period, which typically occurs in autumn. If spring prevention is incomplete, old lesions may reappear, and new infections can occur, leading to higher disease pressure later. This explains why many growers focus only on spring treatments, neglecting the importance of autumn control. To improve prevention and control, several steps should be taken. First, enhance tree nutrition and resilience by using balanced fertilization, managing crop load, protecting leaves, and boosting the tree’s nutrient reserves. Second, strengthen autumn chemical control from the end of the growing season until harvest. Spraying solutions like 50 times diluted chlorhexidine, 800 times diluted thiophanate-methyl, and 78% Kebo at 500 times dilution can help. Also, apply early basal fertilization and manage harvesting timing carefully. Third, combine spring curettage with autumn treatment. Before the spring outbreak, thoroughly remove diseased tissue, cutting deep into healthy areas to promote healing. After scraping, apply agricultural anti-120 at 10 times concentration. For larger lesions, follow-up treatments during the growing season are necessary, repeating the process with agents like rot must clear or 843 recovery solution until fully healed. Precautions include avoiding phytotoxic chemicals during the growing season, ensuring thorough and detailed curettage, removing infected tissues, and cleaning up dead shoots during winter. With consistent autumn and spring prevention over 2–3 years, the disease can be fully controlled, restoring the orchard’s health. Improving tree resistance through proper fertilization and pruning is fundamental to preventing rot. Additionally, applying 4% agricultural anti-720 fruit tree liquid after removing diseased tissues in autumn helps eliminate latent infections. Combining this with regular sprays of 4% anti-120 or Bordeaux mixture ensures long-term control of the disease.

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