I thought citronella was a deterrant and not a chemical weapon against bugs.
Here are some natural stink bug predators. No guarantee the cure will not be worse than the disease, so to speak
Birds:
Species like bluebirds, robins, and cardinals are among the most significant predators of stink bugs.
- Spiders:
Both web-building and hunting spiders, including orb-weavers, jumping spiders, and wolf spiders, prey on stink bugs.
- Insects:
Crickets, katydids, ground beetles, earwigs, and assassin bugs are also known to eat stink bugs.
- Predatory Stink Bugs:
Some stink bug species, like the spined soldier bug, actively hunt and consume other stink bugs.
- Parasitoids:
Wasps like the samurai wasp (Trissolcus japonicus) lay their eggs in stink bug eggs, and their larvae consume the eggs.
- Other Animals:
Bats and some small mammals may also prey on stink bugs or their eggs.