For fruit preservation at the first physiological fruit drop of lychee, it can be used 5-7 days after the blossom shedding with cytokinin at a concentration of 20 mg/liter or 2,4-D at a concentration of 5 mg/liter, or a mixture of the above two medicines

And 35-40 days after the blossom shedding, the canopy can be sprayed with gibberellic acid at a concentration of 20 mg/liter for fruit preservation.