Biological control of Chilli Aphid:

Aphids can be controlled biologically by using their natural enemies Aphidius or Aphidoletes (a parasitic wasp that lays eggs into immature aphids and Aphidolites, whose larvae voraciously feed on aphids) or a combination both  and also ladybird, lacewing Predators  help to encourage beneficial insects .

Natural enemies

Aphidius (parasitic wasp)

Aphidoletes (small midge)

Ladybird