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Pupae
As the fruit ripens and rots, it falls to the ground. Fully mature larvae leave the fruit and burrow into the soil to pupate. In the soil, larvae become inactive and change into oval shaped, light to dark brown, hard pupae. Inside the pupal case, which is the cocoon or chrysalis formed by butterflies, the adult fly develops. At this stage you are unlikely to recognise the presence of fruit fly pupae in the ground.
https://preventfruitfly.com.au/w ... problem/life-cycle/
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