Answer: There are two reasons for fruit drop; a natural thinning process (trees can support only so many fruits in relation to the number of leaves it has), or lack of pollination (insect activity). Many different kinds of fruit trees abort fruits that are not completely pollinated. Spraying when the flowers are open, cold weather when the flowers are open, or a lack of pollinating insects when the flowers are open are all causes for poor pollination. Trees also go through a natural thinning process where it holds on to the fruits most likely to mature, and drops those that are weaker. Hope this answers all your questions about dropping fruit.
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