多效唑(又名pp333),是一种新型的植物生长调节剂,通过化控试验,在幼旺树、盛果期壮树上使用,均取得了良好的效果。它能抑制植物体內赤霉素的合成,具有控制徒长,促进花芽形成,提高座果率等作用,是一种较为理想的植物生长延缓剂。果树使用多效唑已引起果树技术推广部门和广大果农的重视,并开始大面积推广。 Paclobutrazol (aka pp333) is a new type of plant growth regulator that has achieved good results through chemical control tests on young trees and fruit trees. It can restrain the synthesis of gibberellin in plants, and has the functions of controlling leggy growth, promoting the formation of flower buds and increasing the fruit set rate. It is an ideal plant growth retarder. The use of paclobutrazol in fruit trees has caused the attention of fruit tree technology promotion departments and the majority of farmers and started to be popularized in a large area.