It is currently a crucial time for grape bagging in Dali Prefecture, and mastering the proper techniques is essential for successful grape production. Ear bagging plays a key role in protecting the grapes’ appearance and quality. Not only does it shield the fruit from pests and birds, but it also helps prevent cracking and premature ripening. After bagging, the incidence of diseases and pests significantly decreases, and the fruit develops a better color. The skin remains intact, allowing the natural beauty of the variety to shine through.
Late-maturing grape varieties are typically bagged in late June to reduce pesticide use, leaf damage, sunburn, and hail damage. This ensures cleaner fruit surfaces with a bright, attractive color. Bagging is usually done after the first cluster has been formed. When the fruit begins to develop and enters the heading stage, the bags can be applied. Before bagging, a mixture of 22.2% Worn Dipase diluted at 1000–1200 times and 40% pyrimethanil diluted at 1000 times is used to soak the clusters or spray the leaves. Wait until the solution dries before proceeding.
The special transparent paper bags used for grapes are usually sterilized and offer a cost-effective, efficient solution. Each worker can process more than 400 clusters per day. The standard size of the paper bags is 35–40 cm in length and 20–25 cm in width. These dimensions are determined based on the size of the cluster when it matures, ensuring that the bag is always larger than the cluster itself. All parts of the bag, except the top opening, are tightly sealed by stitching or gluing. When applying the bag, gently inflate it and carefully place the cluster inside. The top of the bag can then be tied to the fruiting branch near the stem.
After bagging, it’s important to regularly inspect the clusters. If any rotting occurs, remove the bag immediately, treat the affected area, and replace it with a new one. When harvesting, the bags are removed along with the fruit. For colored grape varieties, the bottom of the bag can be peeled off a few days before harvest to help the fruit develop full color.
It’s important to note that the bagging material must be made of breathable paper. Plastic bags or those with cut corners should not be used, as they can trap moisture and lead to disease.
Another effective method is the "umbrella bag" technique, which is especially suitable for trellis cultivation. The umbrella bag is made from medium-sized paper, newspaper, or plastic film, and is cut halfway along one side. When in use, the cluster is inserted along the cut and the edges are aligned and secured with a pin. This method protects the fruit from sunburn, dust, and disease, while still allowing easy access for spraying and inspection. It is a practical and beneficial technique that can be widely adopted in new production areas and trellis systems.
Dust Mask,Breathing Filter Mask,Building Dust Masks,Protective Mask
Suzhou Fangtian Industries Co., Ltd , https://www.fangtianmasks.com