Lady birds (ladybugs) are beneficial insects that prey on aphids, which are crop-damaging pests.
They are widely used in biological control programs in agriculture.
Other options:
- Baculovirus: used to control insect pests, especially caterpillars, not aphids.
- Dragonfly: predates mosquitoes and small insects, but not specialized for aphids.
- Trichoderma: a fungal biocontrol agent, useful against plant pathogens but not aphids.