What medicine does topaz usually use to protect flowers and fruits?

According to the inquiry of Huinong. Drugs such as com, gibberellin, cytokinin, expansin and new high-fat film can be used to protect flowers and fruits of Vitex negundo, which can promote cell division and expansion, increase nutrient supply, improve disease resistance of trees, and reduce flower and fruit drop, so as to achieve the effect of flower and fruit protection.

Pterocarya stenoptera is an evergreen tree belonging to Pterocarya. The crown of topaz is pot-shaped and the yolk is green; Berry balls are heart-shaped or rectangular, mature fruits are orange and yellow, and the peel is very smooth and translucent; Leaves alternate bisexual flowers, single or several flowers clustered in leaf axils, oblong, lanceolate or obovate; Flowering in March-April; The fruiting period is from July to September. Topaz is named for its bright yellow fruit.