Rust on Angel’s Trumpet: Identification and Control

The Symptom

An angel’s trumpet has a rust‑like coating on leaves that returns after washing. The owner wants to eliminate it before defoliation.

Confirm It’s Rust Fungus

1. Look for raised, powdery orange‑yellow pustules on leaf undersides.
2. Wipe with white tissue—if it leaves a yellow smudge, it’s rust spores.

If It’s Rust

• Remove and destroy infected leaves immediately.
• Apply a labeled fungicide (e.g., myclobutanil, propiconazole) at first leaf emergence next season.
• Improve air flow; avoid overhead watering.

If It’s Not Rust

Residue from sprays, mineral deposits, or insect honeydew can mimic rust. Send a close‑up photo for confirmation.