Bronze orange bug: identify, prevent, control
Updated June 2026
Worst from spring into early summer, September to December, as nymphs mature on citrus.
Bronze orange bugs, often called stink bugs, are sap-sucking shield bugs that attack citrus. They cluster on new growth and flower stems, causing fruit and flowers to drop, and they spray a caustic, smelly fluid that can burn skin and eyes.
How to identify it
- Shield-shaped bugs clustered on citrus stems and new growth, green when young, turning orange then bronze-black
- Wilting, dying flower and fruit stalks and heavy fruit drop
- A strong foul smell when the bugs are disturbed
- Clusters most visible from spring as the bugs mature
Assassin bugs are predators that help control these bugs, so check before you squash. Compare them in our Good Bugs vs Bad Bugs photo guide.
How to prevent it
- Inspect citrus through spring and pick off young green bugs before they mature
- Keep trees healthy and well watered so they cope with light infestations
- Check trees regularly, since early action on nymphs is far easier than tackling adults
- Encourage assassin bugs and other predators by avoiding broad sprays
Organic control, step by step
- Wear goggles, gloves and long sleeves, since the spray can burn skin and eyes
- Knock bugs into a bucket of soapy water early in the morning when they are slow
- Use a small vacuum to remove clusters safely, then drown them
- Spray eco-oil to smother young nymphs while they are small, coating them thoroughly
- Repeat the oil spray as new nymphs appear through spring
- Avoid spraying in the heat of the day to protect the tree and any pollinators
Plants it attacks
Track it in the app. The free Planting Season planner lists the pests and diseases to watch for on every plant in your garden, tuned to your region.