一、苹果落花落果的有两种。 (一)内在因素 1、早期落果(落花)成因是,授粉受精不充分,使子房产生的营养少,造成落花落果。第一次落果后3—4周,进行第二次落果、原因是胚还没有充分形成,养分供应不足,造成落果。 First, there are two kinds of apple falling flowers. (A) of the internal factors 1, the early fall fruit (falling) cause is not pollination fertilization, so that the ovary produce less nutrients, causing disastrous. 3-4 weeks after the first fruit drop, the second drop fruit is carried out because the embryo has not yet been fully formed, the nutrient supply is insufficient and the fruit drop is caused.