What are the control methods for pre-harvest fruit drop in jujube trees

Pre-harvest fruit drop in jujube trees is fairly common, and it is related to the genetic characteristics of the variety, environmental factors, and cultivation techniques. Control method: 4 to 5 weeks before the fruit is fully ripe, spray the whole tree once with 10 to 20 parts per million of naphthaleneacetic acid (or sodium naphthaleneacetate), which can effectively prevent pre-harvest fruit drop. Naphthaleneacetic acid is not soluble in water and needs to be dissolved with alcohol, and it must not be mixed with alkaline pesticides, lime, or potassium dihydrogen phosphate. When using it, the optimal timing and concentration should be determined by comprehensively taking into account factors such as management level, tree vigor, and variety.