Summer is a critical period for red-fruited pomelo, marked by the growth of long summer shoots, young fruits, and fruit enlargement. This phase is not only essential for fertilization but also a key time for pest activity. Timely implementation of summer management practices is crucial to ensure strong vegetative growth, high-quality fruit development, and ultimately, a successful harvest. Below are detailed recommendations for effective summer care.
First, apply strong fruit fertilizer at the right time. Proper fertilization enhances shoot vigor, fruit size, and overall yield. For every 100 catty of fruit produced, apply 5 jin of Sanyuan compound fertilizer or 2 jin of urea and 0.5 jin of potassium fertilizer, divided into five applications. Additionally, foliar sprays with 0.2% phosphoric acid-potassium hydrogen plus 0.2% borax in 100 jin of water should be applied 1–2 times. A mixture of Baoguo Ling No. 2 (50 kg water) can also be used for enhanced results.
Second, thinning and pruning are essential. Thinning summer shoots helps reduce pests, improve fruit set, and promote fruit enlargement. Young trees should have early summer shoots removed, while later summer shoots are retained and pruned to leave only five leaves. Regular removal of unwanted shoots is necessary to maintain tree structure. Fruit thinning should be done to balance fruit load—generally, 3–4 fruits per branch, with fewer on lower branches and more on higher ones. Summer pruning involves removing dense, dead, or unpruned branches to improve light penetration, air circulation, and disease prevention.
Third, pest and disease control is vital during this season. High humidity and warm temperatures create ideal conditions for pests like spider mites, rust mites, scale insects, and various fungal diseases. Preventive measures include spraying appropriate pesticides at key stages. For example, spider mites peak in May-June and July-August; use pyridazinone or swamphen at different dilutions. Rust mites require chemical treatments such as zinc-enriched zinc or pyridazinone. Scale insects should be targeted during the first and second nymph generations, using malathion or amitraz. Fungal diseases like canker, greasy spot, anthracnose, and scab require timely application of copper-based mixtures or fungicides like thiophanate-methyl.
In addition to these, common pests such as aphids, leafhoppers, swallowtail butterflies, thrips, and beetles must be managed. Spraying insecticides like dichlorvos, chlordecone, or dipterex at the right concentrations can help control these pests effectively. For specific pests like Tianniu (longicorn beetles), adult capture, egg scraping, and hole sealing are recommended to prevent damage.
Proper summer management ensures healthy tree growth, high-quality fruit, and a bountiful harvest. By following these steps, farmers can significantly enhance productivity and fruit appearance. It's important to stay vigilant, monitor orchard conditions regularly, and adjust practices accordingly for the best results.
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