One reason why the Soursop fruits may not be holding on the tree is because of insect bite. Or more specifically, Fruit fly attacking. They may come most in the summer because it's usually their season.

Fruit flies may come and take a bite on the young fruits when they're about 3-4 weeks old and are about the size of a small grape. This could thus cause the falling of the fruits.

Usually, a soursop tree may bear fruits some 3-4 years after it's grown from seed. And the fruits may develop about 3-4 weeks after a successful pollination.

Although soursop or most trees in the Annona family overall are not very yummy treats to insects, especially the leaves part because of its bitter taste, the Soursop Fruits may attract unwanted visitors like mealybugs.

To protect soursop from insects, you could try bagging the fruits – even better when they're at a young stage. You can use some sort of plastic bag. Cut or tear a little opening hole about the size of the fruit in the middle of the closed end of the bag. Then, like a T-shirt, fit the bag with the hole up onto the fruit, leaving the open end facing downward. Use plastic ties to tie the bag onto the branch. This can keep some insects away from your soursop.

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