Discussion
Pre-harvest fruit drop in apple is due to
Answer: C
Pre-harvest fruit drop in apple is due to hormonal imbalance.
As apple fruits approach maturity, auxin production in the fruit falls while ethylene rises. This change triggers formation of the abscission layer in the stalk, and fruits fall before they can be picked. It is controlled by spraying the auxin NAA (naphthalene acetic acid) a few weeks before harvest, or by inhibitors of ethylene synthesis.
Insufficient pollination and embryo abortion cause early drop of young fruitlets, not drop just before harvest. Moisture stress can make it worse, but the underlying cause named in standard texts is the hormonal change.
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