In the recent period, the apple tree defoliation phenomenon has become heavier and heavier. It has spread to most fruit areas in the province, extending from the east to the west and extending from the south to the north. Severe people have lost 80% of their leaves, leaving only the apple branches. Hanging, especially in some poorly managed orchards and red Fuji trees without fruit, leaves few leaves. These sentiments have not only directly affected the fruit quality and yield that year, but have led to unproductive results in the following year, and have further aggravated the disease. So why is there a lot of defoliation now? The reasons are more complex and, as a whole, they are caused by the combination of mixed diseases and climatic factors of major pests and diseases. The latent leaves of the golden-lined moth can damage the fallen leaves. The red spider's sucking can also cause fallen leaves, and the main reason is the unhealthy nature of the tree. In most drought-deficit areas, due to long-term droughts in the winter and spring, some damage to the trees, especially to the roots, has been caused, and a large area has continued to cause diseases in the spring and even now, especially the acute disease of root and leaf spot. The middle type is more, resulting in the weakening of the trunk, coupled with the weight bearing fruit, it is more likely to cause the occurrence of leaf diseases. Therefore, from the intuitive phenomenon of the leaves, the early defoliation is one of the main reasons for falling leaves. In addition, there is also a part of fallen leaves due to physiological diseases (nutrition imbalance). Therefore, the prevention and treatment of apple tree deciduous must not rely solely on bactericides to solve the problem. Only the symptoms and root causes can be prevented and the disease can be prevented and rejuvenated. The specific practice is divided into three situations: 1. There are spider mite damage, and severe defoliation, medication formula: Qi primordium or broom net + dry land Feng + diniconazole alcohol or Dasheng M-45 or imported 甲托. 2, with leaf miner damage and severe fallen leaves, the following formulations can be used: Green Kung Fu or Sai Dan or Baode or Diflubenzuron III + Dryland Feng + diniconazole or M-45 or imported jiadu. 3, only serious deciduous: dry abundance + diniconazole alcohol or chlorpromone. In particular, serious harm to the gold-grained fine moth, controlled by sex attractants, the best results.
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