Pests and diseases often significantly weaken tree vitality, leading to early leaf drop. When fruits are affected by pests or diseases, their quality is compromised. In recent years, fruit growers have adopted bagging techniques to protect the fruit, but improper bagging can also lead to various diseases. Therefore, how to properly apply the bags and ensure the quality of the bagged apples is a crucial aspect of fruit production.
First, during the germination phase before the first bloom, the spring shoots grow rapidly, making them vulnerable to pathogen invasion. As temperatures rise, powdery mildew, root rot, and pests like aphids and mites become active. Infected shoots should be pruned immediately, and 10% imidacloprid wettable powder can be used to control pests such as cotton aphids and spider mites. A "General Tree Guard" mixed with Bordeaux mixture can be applied across the orchard to eliminate overwintering pests and diseases.
Second, avoid using chemicals during flowering. Apple trees are highly sensitive to pesticides at this stage, so spraying should be avoided to prevent damage. To reduce flower and fruit drop, artificial pollination using bees can be introduced to improve pollination and increase fruit set.
Third, after flowering, take prompt action against potential pests like apple powdery mildew, blossom blight, mold heart disease, scale insects, and mites. Apply 80% tebuconazole WP to control leaf spot, scab, and anthracnose. For scale insects and other pests, 40% omethoate can be used effectively.
Fourth, spray before bagging. This is a critical period when young fruits lose their fuzz, creating wounds that make them susceptible to pathogens like anthracnose and ring rot. One or two days before bagging, spray the entire orchard with fungicides and insecticides to prevent fruit rot, bollworms, and flea beetles. Use 70% thiophanate-methyl diluted at 800 times, along with 12% hypericin emulsifiable concentrate. Avoid organic phosphorus and Bordeaux mixture to prevent fruit russeting.
Fifth, after bagging, protect the leaves carefully to ensure large, high-quality, and colorful fruits. Early defoliation, powdery mildew, red-and-white spider mites, aphids, and leaf miners all threaten the leaves. After bagging, apply a mix of "melon and fruit sedum," foliar fertilizer, fungicides, and insecticides to combat pests, provide nutrients, and promote fruit growth.
Sixth, after removing the bags, it's an important time for treatment. Many growers neglect this period, thinking that the fruit is already protected. However, once the bags are removed, the fruit remains on the tree for another 20–30 days, making it vulnerable to infections from minor abrasions caused by branches or leaves. At this time, spray the trees with "new high-fat film," insecticide, fungicide, and foliar fertilizer to prevent diseases, reduce bitter pit occurrence, prevent cracking, and maintain bright fruit color.
Seventh, after the fruit is harvested, it's time for post-harvest treatments. As leaves fall and the trees enter dormancy, pests seek shelter for winter. This is a weak point in their life cycle. Keep the orchard clean by removing diseased branches and treating fallen leaves and fruit litter. Then spray the entire tree with "General Tree Guard" mixed with lime sulfur solution to prevent freezing and help the trees survive the winter safely.
In summary, throughout the year, each pesticide application is critical. If one step is neglected, it may cause more problems later. Therefore, fruit growers should focus on all aspects of bagging and management to improve fruit quality and achieve better market prices.
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