What are the causes for Passion fruit and flower drop?

Premature fruit drop can be due to one of the following reasons. Irregular watering can cause the fruit to fall off because when the fruits are near maturity, the ripe fruits need more water. Fruits dry out and fall off as a result of water stress. Continuous irrigation and increasing organic matter in the soil can significantly improve water availability for vines. Other possible causes include fungal diseases, nutrient deficiency, and loss of fruit flies and mites.