(一) 庭院栽植果树,由于品种单一或环境条件狭小,往往造成落花落果严重,因此,保花保果就显得非常重要。引起落花落果的原因是多种多样的,由于树体内在因素所造成的落果,统称生理落果。生理落果尚可分为早期落果和采前落果,早期落果大约发生在花期刚结束 (A) garden planted fruit trees, due to a single species or a small environmental conditions, often resulting in serious drop, therefore, Paul flower and fruit protection is very important. The cause of the drop is the variety, due to the internal factors caused by the tree fall, collectively referred to as physiological drop fruit. Physiological deciduous fruit can be divided into early deciduous fruit and before harvest, early deciduous fruit occurs in the flowering just ended