There are over 5,000 known species of rust on plants. Common rust is a fungal disease that can infect coffee, roses, garlic, almonds, and numerous other plants. Rust is commonly found on mature plants where symptoms appear on the surfaces of lower leaves.
To learn more about rust check out the University of California Agriculture & Natural Resources' Rust Management Guidelines
Note: It is important to break the life cycle of any pests to completely irradicate them. Exact measurements for each farmer will differ slightly due to variations in crops, growing methods, and geography. Make slight adjustments until you've found the ratios that work for you!
Early on, rust can show up as white, slightly raised spots on stems and the undersides of leaves. Next, the spots become covered with reddish-orange spore masses. Finally, leaf pustules may turn yellow-green and eventually black. Severe infestations will cause leaves to drop.
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For questions specific to your particular crop or issue, don't hesitate to reach out via phone (707) 621-8939 or email.
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