Q.Papaya trees
Why are small papaya fruit falling off tree before developing ?
This biggest issue for Papaya Trees is enough sunshine and warm temperatures.
Fruit drop is common and despite all your efforts, it still may occur.
Fruit may drop due to lack of pollination.
Fluctuations in watering. The tree does not tolerate changes in water very well at all.
Soil should be kept moist in hot weather and drier in cool weather. Too much water in the winter months can lead to root rot.
Fruit Fly easily infect the Papaya Fruit. Covering Fruit with a paper bag will help safe guard it.
Damp weather can cause Phytophthora Blight, which can cause fruit drop, with the entire tree declining quickly. Spraying with a copper fungicide when fruit sets can help.
https://www.gardeningknowhow.com/edible/fruits/papaya/growing-papaya-fruit.htm