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Egg-Laying Marks: Female flies pierce the skin of the fruit to lay their eggs. These marks may be visible as punctures or depressions on the fruit surface.

Premature Fruit Drop: Infested fruits often drop prematurely from the plant. This is a common symptom of Bactrocera dorsalis infestation and can result in significant crop losses.

Discoloration of Fruit: The feeding activity of the larvae inside the fruit often leads to discoloration. This is usually a sign of internal damage and decay.

Maggot Presence: One of the most noticeable signs is the presence of the larvae, or maggots, themselves. When cut open, infested fruits will typically reveal these larvae feeding on the flesh of the fruit.

Decay and Rotting of Fruit: As the larvae continue to feed on the fruit, they create conditions favorable to decay, leading to a rotten fruit.

Oozing Fluids: In some cases, you may notice fluids or sap oozing from the fruit, which can be a sign of internal feeding damage.

Hollowed Fruit: The inside of the fruit may become hollow as the larvae consume the flesh, leaving an empty shell behind.

Secondary Infections: The wounds made by the females when laying eggs or by the larvae while feeding can provide entry points for other pathogens, leading to secondary infections. These can present as additional discoloration, rot, or the presence of molds or other pests.

Fruit Deformity: Depending on the stage of fruit development when infestation occurs, the feeding of Bactrocera dorsalis larvae may cause deformities in the shape and size of the fruit.

Reduced Crop Yield: A notable symptom of Bactrocera dorsalis infestation is an overall reduction in crop yield, as many of the fruits may become infested and therefore unmarketable.