Rust
Identification: Reddish-brown, orange, or yellow pustules on leaves and stems.
Symptoms: Leaves turn yellow and drop prematurely, reduced growth and yield.
Control:
Sulfur Dust: Use sulfur to treat and prevent rust on plants.
Remove Affected Leaves: Prune away and discard infected leaves.
Resistant Varieties: Plant rust-resistant varieties.
Improve Air Circulation: Space plants properly to allow for airflow.