When the fruit enters the rapid expansion period or is near maturity, the signs of pest damage are often not seen, but a great deal of fruit shedding occurs, resulting in reduced yields. The effective measures to reduce fruit drop in apple trees are described below: 1. Under the tree top dressing. According to the orchard's fertility foundation and tree nutrient status, nitrogen, phosphorus, and potassium fertilizers can be applied to fruit trees 20-30 days before the arrival of fruit drop, and high-quality organic fertilizers can be applied to fruit trees to prevent fruit trees from falling. 2. Foliar spraying fertilizer. In order to quickly supplement the nutrients of the tree and reduce the fruit drop rate, when the apple tree is close to the physiological fruit drop, it can continuously spray fertilizer 2-3 times and spray 0.5% urea water and 0.4% potassium dihydrogen phosphate solution. 3. Spray plant growth regulators. Before the fruiting of the apple tree, spray 20-40 mg/L Naphthylacetate solution every 10-15 days and spray 2-3 times, which can effectively control physiological fruit drop. It is worth noting that this measure must be established on the basis of improving the nutrient of the tree, and the effect of physiological drop on other causes is not obvious. Facial Recognition ,Face Search,Facial Recognition System,Face Scanner Shenzhen Unisec Technology Co.,ltd , https://www.uniqscansecurity.com