Bronze orange bug: identify, prevent, control

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

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