In recent years, new research and prevention strategies have been developed to address the challenges of viral diseases in fruit trees, particularly apple blossom blight. One of the key approaches involves the use of advanced biological control agents combined with traditional agricultural practices.
During the budding stage of fruit trees, when buds are still not fully expanded, a second-generation viral DNA solution is applied at a dilution of 750 times, mixed with one pound of fresh milk. This treatment is repeated twice more—once seven days before flowering and again before bagging the fruits. This method has proven effective in preventing and controlling blossom blight. Trees that have previously suffered from Hualian disease can be treated for three consecutive years, resulting in no further cases of flower face disease.
The second-generation viral DNA is a neutral acid-specific inhibitor that works well when combined with other agricultural inputs such as antifreeze, organosilicines, acidic pesticides, foliar fertilizers, sugars, vitamins, amino acids, and vinegar. This compatibility enhances its effectiveness while supporting overall tree health.
In addition to these treatments, several other measures are recommended to manage environmental stressors that can increase the risk of viral infections. During the germination period, sudden temperature fluctuations can damage fruit trees and make them more susceptible to viruses. To mitigate this, it's advised to spray apple trees with a mixture of antifreeze diluted 500 times and 0.3% brown sugar (dissolved first) when temperatures drop below 6°C. This helps protect the flower buds from frost damage.
When temperatures rise above 23°C during the flowering period, a solution of 500-times diluted organic silicon silicate and 0.3% vinegar should be sprayed across the entire tree to prevent heat stress and ensure proper pollination. On days with light rain or fog, a 500-times diluted rotten spirit solution, along with fungicides like Keling, should be used to prevent apple rot, mold heart disease, and malformed fruit.
Throughout the growing season, applying foliar fertilizers such as organosilicines and seaweed-based products can improve tree resilience. Adding trace elements like silicon and iodine can also support overall plant health. After the summer solstice, which marks the critical phase for next year’s flower bud development, it's important to supplement the trees with boron. Boron is essential for flower bud formation. The best time to apply this is between June 22nd and August 22nd, using high-purity boric acid or borax (which dissolves better in warm water). Pruning excess shoots to allow better air circulation and sunlight penetration can further promote the formation of healthy flower buds.
Finally, when there is an abundance of flowers, a top dressing should be applied seven days after flowering. Using stable, high-quality iodine-containing fertilizers like foliar sprays or seaweed extracts can help improve fruit quality and yield. These comprehensive measures, when implemented consistently, can significantly reduce the impact of viral diseases and support long-term orchard productivity.
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