Rust
fungusVarious (Pucciniales)
Fungal disease producing orange-brown pustules on leaf undersides. Affects many vegetables and beans.
Identification
Orange, brown, or rust-colored powdery pustules on leaf undersides. Yellow spots on upper leaf surfaces. Pustules release spores when touched.
Damage & Symptoms
Leaf yellowing and drop. Reduced vigor. Severe infections reduce yield. Bean rust can devastate crop.
Organic Control
Sulfur spray (preventive). Neem oil. Remove infected leaves. Improve air circulation.
Chemical Control
Myclobutanil. Mancozeb. Chlorothalonil.
Prevention
Resistant varieties. Wide spacing for airflow. Avoid overhead watering. Crop rotation. Remove crop debris.
Data confidence: medium | Source: curated_ipm