苹果树上使用多效唑，能矮化树冠，促进短枝形成，调节适龄不结果树的营养生长，促进花芽分化，提高着果率，增加产量，提高果实品质。但如果使用不当，也会给树体造成不良影响，因此使用多效唑时应注意以下九要点：①针对花量少，产量偏低的幼旺树或成龄壮树施用，对中庸树、 The use of paclobutrazol on apple trees can dwarf the canopy, promote the formation of short branches, regulate the vegetative growth of tree under unsuitable age, promote flower bud differentiation, increase fruit yield, increase yield and improve fruit quality. However, if used improperly, will also have an adverse effect on the tree, so the use of paclobutrazol should pay attention to the following nine points: ① for less flowers, low yield of young trees or mature trees, the moderate tree,