Small Tips for Bagging Peaches

During peach tree cultivation, in addition to essential practices such as early‑season fertilization, irrigation, and pesticide spraying, bagging is the most critical step. The primary purpose of bagging is to protect the fruit from insect damage; after bagging, fewer pesticides are needed, effectively preventing various pest infestations. This not only reduces pesticide costs but also helps maintain the peaches’ attractive appearance.

I. Peach Bag Selection

Peach fruit bags come in single‑layer, double‑layer, and three‑layer varieties, with paper colors ranging from white to light shades and dark, light‑blocking types. The choice of bag should be based on the peach cultivar’s coloring characteristics and production objectives. Generally, early‑maturing peaches and nectarines are best suited to white bags; mid‑early varieties benefit from double‑layer bags that are yellow on the outside and white on the inside; medium‑ to late‑maturing varieties that color readily are best covered with three‑layer, dark, light‑blocking bags; and for varieties that are difficult to color, double‑layer or three‑layer bags with a dark exterior and a white interior yield the best results.

II. Peach Bagging Technology

Bagging should be carried out during the second physiological fruit‑drop stage—approximately 50 to 55 days after flowering, when the stone has hardened. Before bagging, make a longitudinal slit 4 to 5 cm long along the central seam of the fruit bag. When placing the bag, first open it and allow it to puff up, ensuring that the ventilation and drainage holes at the two bottom corners remain fully open. Once the fruit is inserted, align the pedicel or the parent branch with the central seam of the bag opening, then slip the peach together with a short segment of the parent branch into the bag. Fold the bag opening inward from the center toward both sides in a “folding fan” pattern, and finally secure the opening tightly with wire. Do not enclose any leaves inside the bag; ensure the fruit hangs freely within the bag to prevent sunburn.

III. Post-Bagging Management

After bagging, be sure to control bag‑injuring pests such as the peach fruit borer, the oriental fruit moth, and the peach twig borer. During the fruit‑expansion stage, the early coloring stage, and 15 days before harvest, apply a foliar fertilizer or potassium dihydrogen phosphate once each to enhance color and yield. Apply ample farmyard manure, limit irrigation, improve fruit quality, and harvest at the optimal time. For bagged peaches, the timing of bag removal is critical; it should be determined based on the type of bag, the characteristics of the peach variety, market distance, and the appropriate harvest window.

Harvesting fruit too early or too late results in suboptimal quality, which can negatively affect selling prices. In general, the timing for bag removal depends on the type of bag: dark‑colored, light‑blocking bags should be removed earlier, while light‑colored, translucent bags can be left on longer; varieties that are difficult to color should be bagged earlier, whereas those that color readily can be bagged later. For early‑ripening, easily colored varieties and nectarines, remove the bags 2–3 days before harvest; for varieties that are slow to color, remove them 4–5 days before harvest. For mid‑early maturing varieties grown under light‑colored, double‑layer bags, remove the bags 6–8 days before harvest. For medium‑ to late‑maturing, non‑coloring varieties cultivated under light‑colored, single‑ or double‑layer bags, remove the bags 6–8 days before harvest. For medium‑ to late‑maturing, easily colored varieties grown under dark‑colored, double‑ or triple‑layer bags, remove the outer layer 10–12 days before harvest (for triple‑layer bags, remove two layers), and strip all bags completely 4–5 days before harvest.